Package org.eclipse.persistence.expressions

Class Expression

java.lang.Object

org.eclipse.persistence.expressions.Expression

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

org.eclipse.persistence.internal.expressions.BaseExpression

public abstract class Expression
extends Object
implements Serializable, Cloneable

Purpose: Define an object-level representation of a database query where clause.

Description: An expression is a tree-like structure that defines the selection criteria for a query against objects in the database. The expression has the advantage over SQL by being at the object-level, i.e. the object model attributes and relationships can be used to be query on instead of the database field names. Because it is an object, not a string the expression has the advantage that is can be easily manipulated through code to easily build complex selection criterias.

Responsibilities:

• Store the selection criteria in a tree-like structure.
• Support public manipulation protocols for all comparison and function operators.
• Use operator overloading to support all primitive types as well as objects.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected org.eclipse.persistence.internal.helper.DatabaseTable	currentAlias
protected int	hashCode	PERF: Cache the hashCode.
protected org.eclipse.persistence.internal.helper.DatabaseTable	lastTable	Temporary values for table aliasing
protected boolean	selectIfOrderedBy
static boolean	shouldUseUpperCaseForIgnoreCase	Use the upper() function for case insensitive expression operations (default).

Constructor Summary

Constructors

Constructor	Description
Expression()	Base Expression Constructor.

Method Summary

Modifier and Type	Method	Description
Expression	addDate(String datePart, int numberToAdd)	PUBLIC: Function, return an expression that adds to a date based on the specified datePart.
Expression	addDate(String datePart, Object numberToAdd)	PUBLIC: Function, return an expression that adds to a date based on the specified datePart.
Expression	addMonths(int months)	PUBLIC: Function, to add months to a date.
Expression	addMonths(Object months)	PUBLIC: Function, to add months to a date.
Expression	alias(String alias)	ADVANCED: Return an expression for the alias.
org.eclipse.persistence.internal.helper.DatabaseTable	aliasForTable(org.eclipse.persistence.internal.helper.DatabaseTable table)	INTERNAL: Find the alias for a given table
Expression	all(boolean[] theBooleans)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	all(byte[] theBytes)	PUBLIC: Return an expression that is used with a comparison expression.
Expression	all(char[] theChars)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	all(double[] theDoubles)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	all(float[] theFloats)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	all(int[] theInts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	all(long[] theLongs)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	all(short[] theShorts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	all(Object[] theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	all(List theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	all(Expression arguments)
Expression	all(ReportQuery subQuery)
Expression	allOf(String attributeName, Expression criteria)	PUBLIC: Returns an expression equivalent to all of attributeName holding true for criteria.
Expression	and(Expression theExpression)	PUBLIC: Return an expression that is the boolean logical combination of both expressions.
Expression	any(boolean[] theBooleans)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	any(byte[] theBytes)	PUBLIC: Return an expression that is used with a comparison expression.
Expression	any(char[] theChars)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	any(double[] theDoubles)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	any(float[] theFloats)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	any(int[] theInts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	any(long[] theLongs)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	any(short[] theShorts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	any(Object[] theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	any(List theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	any(Expression arguments)
Expression	any(ReportQuery subQuery)
Expression	anyOf(String attributeName)	PUBLIC: Return an expression representing traversal of a 1:many or many:many relationship.
Expression	anyOf(String attributeName, boolean shouldJoinBeIndependent)	ADVANCED: Return an expression representing traversal of a 1:many or many:many relationship.
Expression	anyOfAllowingNone(String attributeName)	ADVANCED: Return an expression representing traversal of a 1:many or many:many relationship.
Expression	anyOfAllowingNone(String attributeName, boolean shouldJoinBeIndependent)	ADVANCED: Return an expression representing traversal of a 1:many or many:many relationship.
Expression	as(String alias)	ADVANCED: Assign an alias to the expression in the select clause.
Expression	ascending()	PUBLIC: This can only be used within an ordering expression.
Expression	asciiValue()	PUBLIC: Function, returns the single character strings ascii value.
Expression	asOf(AsOfClause pastTime)	Sets all tables represented by this expression to be queried as of a past time.
protected void	assignAlias(String name, org.eclipse.persistence.internal.helper.DatabaseTable tableOrExpression)	INTERNAL: Alias a particular table within this node
int	assignTableAliasesStartingAt(int initialValue)	INTERNAL: Assign aliases to any tables which I own.
Expression	average()	PUBLIC: Function, This represents the aggregate function Average.
Expression	between(byte leftValue, byte rightValue)	PUBLIC: Function, between two bytes
Expression	between(char leftChar, char rightChar)	PUBLIC: Function, between two chars
Expression	between(double leftValue, double rightValue)	PUBLIC: Function, between two doubles
Expression	between(float leftValue, float rightValue)	PUBLIC: Function, between two floats
Expression	between(int leftValue, int rightValue)	PUBLIC: Function, between two ints
Expression	between(long leftValue, long rightValue)	PUBLIC: Function, between two longs
Expression	between(short leftValue, short rightValue)	PUBLIC: Function, between two shorts
Expression	between(Object leftValue, Object rightValue)	PUBLIC: Return an expression that compares if the receiver's value is between two other values.
Expression	between(Expression leftExpression, Expression rightExpression)
org.eclipse.persistence.internal.expressions.ArgumentListFunctionExpression	caseConditionStatement()	INTERNAL: Creates an ArgumentListFunctionExpression that is capable of creating a case statement of the form:
Expression	caseConditionStatement(Map<Expression,Object> caseConditions, Object defaultItem)	PUBLIC: Function Convert values returned by the query to values given in the caseConditions Map.
org.eclipse.persistence.internal.expressions.ArgumentListFunctionExpression	caseStatement()	INTERNAL: Creates an ArgumentListFunctionExpression that is capable of creating a case statement of the form:
Expression	caseStatement(Map caseItems, Object defaultItem)	PUBLIC: Function Convert values returned by the query to values given in the caseItems Map.
Expression	cast(String type)	PUBLIC: Cast the value to the database type.
Object	clone()	INTERNAL: Clone the expression maintaining clone identity in the inter-connected expression graph.
Expression	cloneUsing(Expression newBase)	INTERNAL: This expression is built on a different base than the one we want.
org.eclipse.persistence.internal.expressions.ArgumentListFunctionExpression	coalesce()
org.eclipse.persistence.internal.expressions.ArgumentListFunctionExpression	coalesce(Collection expressions)	PUBLIC: Function Return null if all arguments are null and the first non-null argument otherwise The equivalent of the COALESCE SQL function
int	computeHashCode()	INTERNAL: Compute a consistent hash-code for the expression.
Expression	concat(Object left)	PUBLIC: Function, returns the concatenation of the two string values.
Expression	containsAllKeyWords(String spaceSeparatedKeyWords)	PUBLIC: Return an expression that performs a key word search.
Expression	containsAnyKeyWords(String spaceSeparatedKeyWords)	PUBLIC: Return an expression that performs a key word search.
Expression	containsSubstring(String theValue)	PUBLIC: Return an expression that compares if the receivers value contains the substring.
Expression	containsSubstring(Expression expression)	PUBLIC: Return an expression that compares if the receivers value contains the substring.
Expression	containsSubstringIgnoringCase(String theValue)	PUBLIC: Return an expression that compares if the receivers value contains the substring, ignoring case.
Expression	containsSubstringIgnoringCase(Expression expression)	PUBLIC: Return an expression that compares if the receivers value contains the substring, ignoring case.
protected void	convertNodeToUseOuterJoin()
Expression	convertToUseOuterJoin()	INTERNAL: Modify this expression to use outer joins wherever there are equality operations between two field nodes.
Expression	copiedVersionFrom(Map alreadyDone)	INTERNAL:
Expression	count()	PUBLIC: This represents the aggregate function Average.
Expression	create(Expression base, Object singleArgument, ExpressionOperator anOperator)	INTERNAL:
Expression	create(Expression base, List arguments, ExpressionOperator anOperator)	INTERNAL:
Expression	createWithBaseLast(Expression base, Object singleArgument, ExpressionOperator anOperator)	INTERNAL:
Expression	currentDate()	PUBLIC: This gives access to the current date on the database through expression.
Expression	currentDateDate()	PUBLIC: This gives access to the current date only on the database through expression.
Expression	currentTime()	PUBLIC: This gives access to the current time only on the database through expression.
Expression	currentTimeStamp()	PUBLIC: This gives access to the current timestamp on the database through expression.
Expression	dateDifference(String datePart, Date date)	PUBLIC: Function, Return the difference between the queried part of a date(i.e.
Expression	dateDifference(String datePart, Expression comparisonExpression)	PUBLIC: Function, Return the difference between the queried part of a date(i.e.
Expression	dateName(String datePart)	PUBLIC: return a string that represents the given part of a date.
Expression	datePart(String datePart)	PUBLIC: Function return an integer which represents the requested part of the date.
Expression	dateToString()	PUBLIC: Function, returns the date converted to the string value in the default database format.
Expression	decode(Map decodeableItems, String defaultItem)	PUBLIC: Function Convert values returned by the query to values given in the decodeableItems Map.
Expression	descending()	PUBLIC: This can only be used within an ordering expression.
String	descriptionOfNodeType()	INTERNAL: Used in debug printing of this node.
Expression	difference(String expression)	PUBLIC: Function return a value which indicates how much difference there is between two expressions.
Expression	distinct()	PUBLIC: Function, This represents the distinct option inside an aggregate function.
boolean	doesConform(Object object, org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow, int valueHolderPolicy)	INTERNAL: Check if the object conforms to the expression in memory.
boolean	doesConform(Object object, org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow, int valueHolderPolicy, boolean objectIsUnregistered)	INTERNAL: New parameter added to doesConform for feature 2612601
Expression	equal(boolean theBoolean)
Expression	equal(byte theValue)
Expression	equal(char theChar)
Expression	equal(double theValue)
Expression	equal(float theValue)
Expression	equal(int theValue)
Expression	equal(long theValue)
Expression	equal(short theValue)
Expression	equal(Object theValue)	PUBLIC: Return an expression that compares if the receiver's value is equal to the other value.
Expression	equal(Expression theValue)	Returns an expression that compares if the receiver's value is equal to the other value.
Expression	equalOuterJoin(Object theValue)	INTERNAL: Return an expression representing an outer join comparison
Expression	equalOuterJoin(Expression theValue)	INTERNAL: Return an expression representing an outer join comparison
boolean	equals(Object expression)	INTERNAL: Return if the expression is equal to the other.
Expression	equalsIgnoreCase(String theValue)	PUBLIC: Return an expression that compares if the receiver's value is equal to the other value, ignoring case.
Expression	equalsIgnoreCase(Expression theValue)	PUBLIC: Return an expression that compares if the receiver's value is equal to the other value, ignoring case.
Expression	except(Expression arguments)	PUBLIC: Return a except expression with the subquery.
Expression	except(ReportQuery query)	PUBLIC: Return a except expression with the subquery.
Expression	exceptAll(Expression arguments)	PUBLIC: Return a except all expression with the subquery.
Expression	exceptAll(ReportQuery query)	PUBLIC: Return a except all expression with the subquery.
Expression	exists(ReportQuery subQuery)	PUBLIC: Return a sub query expression.
Expression	existsNode(String xpath)	PUBLIC: XMLType Function, gets the number of nodes returned by the given xpath expression returns 0 if there are none
Expression	extract(String part)	PUBLIC: Extract the date part from the date/time value.
boolean	extractFields(boolean requireExactMatch, boolean primaryKey, ClassDescriptor descriptor, List<org.eclipse.persistence.internal.helper.DatabaseField> searchFields, Set<org.eclipse.persistence.internal.helper.DatabaseField> foundFields)	INTERNAL: Return if the expression is not a valid primary key expression and add all primary key fields to the set.
boolean	extractPrimaryKeyValues(boolean requireExactMatch, ClassDescriptor descriptor, org.eclipse.persistence.internal.sessions.AbstractRecord primaryKeyRow, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow)	INTERNAL: Extract the primary key from the expression into the row.
Expression	extractValue(String xpath)	PUBLIC: XMLType Function, extracts a value from an XMLType field
boolean	extractValues(boolean primaryKeyOnly, boolean requireExactMatch, ClassDescriptor descriptor, org.eclipse.persistence.internal.sessions.AbstractRecord primaryKeyRow, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow)	INTERNAL: Extract the primary key from the expression into the row.
Expression	extractXml(String xpath)	PUBLIC: XMLType Function, extracts a secton of XML from a larget XML document
static Expression	from(Object value, Expression base)	INTERNAL: Create an expression node.
static Expression	fromConstant(Object value, Expression base)	INTERNAL: Create an expression node.
static Expression	fromLiteral(String value, Expression base)	INTERNAL: Create an expression node.
Expression	get(String attributeName)	PUBLIC: Return an expression that wraps the attribute or query key name.
Expression	get(String attributeName, boolean forceInnerJoin)	PUBLIC: Return an expression that wraps the attribute or query key name.
Expression	getAlias(Expression subSelect)	ADVANCED: Return an expression representing a sub-select in the from clause.
Expression	getAllowingNull(String attributeName)	ADVANCED: Return an expression that wraps the attribute or query key name.
AsOfClause	getAsOfClause()	Answers the past time the expression is explicitly as of.
AsOfClause	getAsOfClauseRecursively()	INTERNAL: For Flashback: If this expression is not already as of some timestamp gets the clause from the base expression.
abstract ExpressionBuilder	getBuilder()	INTERNAL: Return the expression builder which is the ultimate base of this expression, or null if there isn't one (shouldn't happen if we start from a root)
org.eclipse.persistence.internal.helper.DatabaseField	getClonedField()	INTERNAL: If there are any fields associated with this expression, return them
Expression	getField(String fieldName)	ADVANCED: Return an expression representing a field in a data-level query.
Expression	getField(org.eclipse.persistence.internal.helper.DatabaseField field)	ADVANCED: Return an expression representing a field in a data-level query.
List<org.eclipse.persistence.internal.helper.DatabaseField>	getFields()	INTERNAL:
Object	getFieldValue(Object objectValue, org.eclipse.persistence.internal.sessions.AbstractSession session)	INTERNAL: Transform the object-level value into a database-level value
Expression	getFunction(int selector)	ADVANCED: This can be used for accessing user defined functions.
Expression	getFunction(int selector, List arguments)	ADVANCED: This can be used for accessing user defined functions that have arguments.
Expression	getFunction(String functionName)	ADVANCED: Return a user defined function accepting the argument.
Expression	getFunction(String functionName, Object argument)	ADVANCED: Return a user defined function accepting the argument.
Expression	getFunctionWithArguments(String functionName, List arguments)	ADVANCED: Return a user defined function accepting all of the arguments.
ClassDescriptor	getLeafDescriptor(DatabaseQuery query, ClassDescriptor rootDescriptor, org.eclipse.persistence.internal.sessions.AbstractSession session)	INTERNAL: Lookup the descriptor for this item by traversing its expression recursively.
DatabaseMapping	getLeafMapping(DatabaseQuery query, ClassDescriptor rootDescriptor, org.eclipse.persistence.internal.sessions.AbstractSession session)	INTERNAL: Lookup the mapping for this item by traversing its expression recursively.
String	getName()	INTERNAL:
Expression	getNumberVal()	PUBLIC: XMLType Function - gets a number value from an XMLType
ExpressionOperator	getOperator()	INTERNAL: Most expression have operators, so this is just a convenience method.
static ExpressionOperator	getOperator(int selector)	INTERNAL: Create a new expression tree with the named operator.
List<org.eclipse.persistence.internal.helper.DatabaseTable>	getOwnedTables()	INTERNAL: Return the tables that this node owns for purposes of table aliasing.
Expression	getParameter(String parameterName)	ADVANCED: Return an expression representing a parameter with the given name.
Expression	getParameter(String parameterName, Object type)	INTERNAL: Return an expression representing a parameter with the given name and type
Expression	getParameter(org.eclipse.persistence.internal.helper.DatabaseField field)	ADVANCED: Return an expression representing a parameter with the given name.
Expression	getProperty(org.eclipse.persistence.internal.helper.DatabaseField field)	ADVANCED: Return an expression representing a property with the given name.
List<org.eclipse.persistence.internal.helper.DatabaseField>	getSelectionFields()	INTERNAL:
List<org.eclipse.persistence.internal.helper.DatabaseField>	getSelectionFields(ReadQuery query)
org.eclipse.persistence.internal.sessions.AbstractSession	getSession()	INTERNAL:
Expression	getStringVal()	PUBLIC: XMLType Function - gets a string value from an XMLType
Expression	getTable(String tableName)	ADVANCED: Return an expression representing a table in a data-level query.
Expression	getTable(org.eclipse.persistence.internal.helper.DatabaseTable table)	ADVANCED: Return an expression representing a table in a data-level query.
org.eclipse.persistence.internal.expressions.TableAliasLookup	getTableAliases()	INTERNAL: Return the aliases used.
Expression	greaterThan(boolean theBoolean)	PUBLIC: Return an expression that compares if the receivers value is equal to the other value.
Expression	greaterThan(byte theValue)	PUBLIC: Return an expression that compares if the receivers value is equal to the other value.
Expression	greaterThan(char theChar)	PUBLIC: Return an expression that compares if the receivers value is equal to the other value.
Expression	greaterThan(double theValue)	PUBLIC: Return an expression that compares if the receivers value is equal to the other value.
Expression	greaterThan(float theValue)	PUBLIC: Return an expression that compares if the receivers value is equal to the other value.
Expression	greaterThan(int theValue)	PUBLIC: Return an expression that compares if the receivers value is equal to the other value.
Expression	greaterThan(long theValue)	PUBLIC: Return an expression that compares if the receivers value is equal to the other value.
Expression	greaterThan(short theValue)	PUBLIC: Return an expression that compares if the receivers value is equal to the other value.
Expression	greaterThan(Object theValue)	PUBLIC: Return an expression that compares if the receiver's value is greater than the other value.
Expression	greaterThan(Expression theValue)
Expression	greaterThanEqual(boolean theBoolean)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
Expression	greaterThanEqual(byte theValue)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
Expression	greaterThanEqual(char theChar)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
Expression	greaterThanEqual(double theValue)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
Expression	greaterThanEqual(float theValue)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
Expression	greaterThanEqual(int theValue)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
Expression	greaterThanEqual(long theValue)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
Expression	greaterThanEqual(short theValue)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
Expression	greaterThanEqual(Object theValue)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
Expression	greaterThanEqual(Expression theValue)	PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value.
boolean	hasAsOfClause()	ADVANCED: Answers true if this is to be queried as of a past time.
boolean	hasBeenAliased()	INTERNAL: Answers if the database tables associated with this expression have been aliased.
int	hashCode()	INTERNAL: Return a consistent hash-code for the expression.
Expression	hexToRaw()	PUBLIC: Function, returns binary array value for the hex string.
Expression	ifNull(Object nullValue)	PUBLIC: Function return a specific value if item returned from the query is null.
Expression	in(boolean[] theBooleans)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(byte[] theBytes)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(char[] theChars)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(double[] theDoubles)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(float[] theFloats)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(int[] theInts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(long[] theLongs)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(short[] theShorts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(Object[] theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(Collection theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	in(Expression arguments)
Expression	in(ReportQuery subQuery)
Expression	index()
Expression	indexOf(Object substring)	PUBLIC: Function, returns the integer index of the substring within the source string.
Expression	intersect(Expression arguments)	PUBLIC: Return a intersect expression with the subquery.
Expression	intersect(ReportQuery query)	PUBLIC: Return a intersect expression with the subquery.
Expression	intersectAll(Expression arguments)	PUBLIC: Return a intersect all expression with the subquery.
Expression	intersectAll(ReportQuery query)	PUBLIC: Return a intersect all expression with the subquery.
boolean	isClassTypeExpression()	INTERNAL:
boolean	isCompoundExpression()	INTERNAL:
boolean	isConstantExpression()	INTERNAL:
boolean	isDataExpression()	INTERNAL:
Expression	isEmpty(String attributeName)	PUBLIC: A logical expression for the collection attributeName being empty.
boolean	isExpressionBuilder()	INTERNAL:
boolean	isFieldExpression()	INTERNAL:
Expression	isFragment()	PUBLIC: XMLType Function - evaluates to 0 if the xml is a well formed document and 1 if the document is a fragment
boolean	isFunctionExpression()	INTERNAL:
boolean	isLiteralExpression()	INTERNAL:
boolean	isLogicalExpression()	INTERNAL:
boolean	isMapEntryExpression()	INTERNAL:
Expression	isNull()	PUBLIC: Compare to null.
boolean	isObjectExpression()	INTERNAL:
boolean	isParameterExpression()	INTERNAL:
boolean	isQueryKeyExpression()	INTERNAL:
boolean	isRelationExpression()	INTERNAL:
boolean	isSubSelectExpression()	INTERNAL:
boolean	isTableExpression()	INTERNAL:
boolean	isTreatExpression()	INTERNAL:
boolean	isValueExpression()	INTERNAL: Subclasses implement (isParameterExpression() || isConstantExpression())
void	iterateOn(org.eclipse.persistence.internal.expressions.ExpressionIterator iterator)	INTERNAL: For iterating using an inner class
Expression	join(Expression target, Expression onClause)	ADVANCED: Defines a join between the two objects based on the specified ON clause.
Expression	lastDay()	PUBLIC: Function, returns the date with the last date in the months of this source date.
Expression	leftJoin(Expression target, Expression onClause)	ADVANCED: Defines an outer join between the two objects based on the specified ON clause.
Expression	leftPad(int size, Object substring)	PUBLIC: Function, returns the string padded with the substring to the size.
Expression	leftPad(Object size, Object substring)	PUBLIC: Function, returns the string padded with the substring to the size.
Expression	leftTrim()	PUBLIC: Function, returns the string left trimmed for white space.
Expression	leftTrim(Object substring)	PUBLIC: Function, returns the string with the substring trimed from the left.
Expression	length()	PUBLIC: Function, returns the size of the string.
Expression	lessThan(boolean theBoolean)	PUBLIC: Return an expression that compares if the receivers value is less than the other value.
Expression	lessThan(byte theValue)	PUBLIC: Return an expression that compares if the receivers value is less than the other value.
Expression	lessThan(char theChar)	PUBLIC: Return an expression that compares if the receivers value is less than the other value.
Expression	lessThan(double theValue)	PUBLIC: Return an expression that compares if the receivers value is less than the other value.
Expression	lessThan(float theValue)	PUBLIC: Return an expression that compares if the receivers value is less than the other value.
Expression	lessThan(int theValue)	PUBLIC: Return an expression that compares if the receivers value is less than the other value.
Expression	lessThan(long theValue)	PUBLIC: Return an expression that compares if the receivers value is less than the other value.
Expression	lessThan(short theValue)	PUBLIC: Return an expression that compares if the receivers value is less than the other value.
Expression	lessThan(Object theValue)	PUBLIC: Return an expression that compares if the receivers value is less than the other value.
Expression	lessThan(Expression theValue)
Expression	lessThanEqual(boolean theBoolean)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	lessThanEqual(byte theValue)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	lessThanEqual(char theChar)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	lessThanEqual(double theValue)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	lessThanEqual(float theValue)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	lessThanEqual(int theValue)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	lessThanEqual(long theValue)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	lessThanEqual(short theValue)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	lessThanEqual(Object theValue)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	lessThanEqual(Expression theValue)	PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value.
Expression	like(String value)	PUBLIC: Return an expression that compares if the receivers value is like other value.
Expression	like(String value, String escapeSequence)	PUBLIC: Return an expression that compares if the receivers value is like other value.
Expression	like(Expression argument)	PUBLIC: Return an expression that compares if the receivers value is like other value.
Expression	like(Expression value, Expression escapeSequence)	PUBLIC: Return an expression that compares if the receivers value is like other value.
Expression	likeIgnoreCase(String theValue)	PUBLIC: Return an expression that compares if the receivers value is like the other value, ignoring case.
Expression	likeIgnoreCase(Expression theValue)	PUBLIC: Return an expression that compares if the receivers value is like the other value, ignoring case.
Expression	literal(String literal)	ADVANCED: Return an expression on the literal.
Expression	locate(Object str)	PUBLIC: Function, returns the position of str in this
Expression	locate(Object str, Object fromIndex)	PUBLIC: Function, returns the position of str in this, starting the search at fromIndex.
Expression	locate(String str, int fromIndex)	PUBLIC: Function, returns the position of str in this, starting the search at fromIndex.
Expression	mapEntry()	PUBLIC: Return a Map.Entry containing the key and the value from a mapping that maps to a java.util.Map This expression can only be used as a return value in a ReportQuery and cannot be used as part of the WHERE clause in any query EclipseLink: eb.get("mapAttribute").mapEntry()
Expression	mapKey()	PUBLIC: Return the key from a mapping that maps to a java.util.Map This expression can be used either in as a return value in a ReportQuery or in the WHERE clause in a query EclipseLink: eb.get("mapAttribute").mapKey()
Expression	maximum()	PUBLIC: This represents the aggregate function Maximum.
Expression	minimum()	PUBLIC: This represents the aggregate function Minimum.
Expression	monthsBetween(Object otherDate)	PUBLIC: Function, returns the decimal number of months between the two dates.
Expression	newTime(String timeZoneFrom, String timeZoneTo)	PUBLIC: funcation return a date converted to a new timezone.
Expression	nextDay(Object dayName)	PUBLIC: Function, returns the date with the next day from the source date as the day name given.
Expression	noneOf(String attributeName, Expression criteria)	PUBLIC: Returns an expression equivalent to none of attributeName holding true for criteria.
Expression	normalize(org.eclipse.persistence.internal.expressions.ExpressionNormalizer normalizer)	INTERNAL: Normalize into a structure that is printable.
Expression	not()	PUBLIC: Return an expression that is the boolean logical negation of the expression.
Expression	notBetween(byte leftValue, byte rightValue)	PUBLIC: Return an expression that compares if the receivers value is not between two other values.
Expression	notBetween(char leftChar, char rightChar)	PUBLIC: Return an expression that compares if the receivers value is not between two other values.
Expression	notBetween(double leftValue, double rightValue)	PUBLIC: Return an expression that compares if the receivers value is not between two other values.
Expression	notBetween(float leftValue, float rightValue)	PUBLIC: Return an expression that compares if the receivers value is not between two other values.
Expression	notBetween(int leftValue, int rightValue)	PUBLIC: Return an expression that compares if the receivers value is not between two other values.
Expression	notBetween(long leftValue, long rightValue)	PUBLIC: Return an expression that compares if the receivers value is not between two other values.
Expression	notBetween(short leftValue, short rightValue)	PUBLIC: Return an expression that compares if the receivers value is not between two other values.
Expression	notBetween(Object leftValue, Object rightValue)	PUBLIC: Return an expression that compares if the receivers value is not between two other values.
Expression	notBetween(Expression leftExpression, Expression rightExpression)	PUBLIC: Return an expression that compares if the receivers value is not between two other values.
Expression	notEmpty(String attributeName)	PUBLIC: A logical expression for the collection attributeName not being empty.
Expression	notEqual(boolean theBoolean)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notEqual(byte theValue)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notEqual(char theChar)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notEqual(double theValue)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notEqual(float theValue)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notEqual(int theValue)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notEqual(long theValue)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notEqual(short theValue)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notEqual(Object theValue)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notEqual(Expression theValue)	PUBLIC: Return an expression that compares if the receivers value is not equal to the other value.
Expression	notExists(ReportQuery subQuery)	PUBLIC: Return a sub query expression.
Expression	notIn(boolean[] theBooleans)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(byte[] theBytes)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(char[] theChars)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(double[] theDoubles)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(float[] theFloats)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(int[] theInts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(long[] theLongs)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(short[] theShorts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(Object[] theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(Collection theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	notIn(Expression arguments)
Expression	notIn(ReportQuery subQuery)
Expression	notLike(String aString)	PUBLIC: Return an expression that compares if the receivers value is not like the other value.
Expression	notLike(String value, String escapeSequence)	PUBLIC: Return an expression that compares if the receivers value is not like the other value.
Expression	notLike(Expression arguments)	PUBLIC: Return an expression that compares if the receivers value is not like the other value.
Expression	notLike(Expression value, Expression escapeSequence)	PUBLIC: Return an expression that compares if the receivers value is not like the other value.
Expression	notNull()	PUBLIC: Return an expression representing a comparison to null
Expression	nullIf(Object object)	PUBLIC: Function Test if arguments are equal, returning null if they are and the value of the first expression otherwise.
Expression	nullsFirst()	PUBLIC: This can only be used within an ordering expression.
Expression	nullsLast()	PUBLIC: This can only be used within an ordering expression.
Expression	operator(String name, List arguments)	ADVANCED: This can be used for accessing user defined operators that have arguments.
Expression	or(Expression theExpression)	PUBLIC: Return an expression that is the boolean logical combination of both expressions.
Expression	performOperator(ExpressionOperator anOperator, List args)	INTERNAL:
protected void	postCopyIn(Map alreadyDone)
Expression	postfixSQL(String sqlString)	ADVANCED: Inserts the SQL as is directly into the expression.
Expression	prefixSQL(String sqlString)	ADVANCED: Insert the SQL as is directly into the expression.
void	printJava(org.eclipse.persistence.internal.expressions.ExpressionJavaPrinter printer)	INTERNAL: Print java for project class generation
abstract void	printSQL(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer)	INTERNAL: Print SQL
abstract Expression	rebuildOn(Expression newBase)	INTERNAL: This expression is built on a different base than the one we want.
Expression	ref()	ADVANCED: For Object-relational support.
Expression	regexp(String regexp)	PUBLIC: Return an expression that compares if the receivers value matches the regular expression.
Expression	regexp(Expression regexp)	PUBLIC: Return an expression that compares if the receivers value matches the regular expression.
protected Expression	registerIn(Map alreadyDone)
Expression	replace(Object stringToReplace, Object stringToReplaceWith)	PUBLIC: Function, returns the string with occurances of the first substring replaced with the second substring.
Expression	replicate(int constant)	PUBLIC: return the result of this query repeated a given number of times.
Expression	replicate(Object theValue)	PUBLIC: return the result of this query repeated a given number of times.
protected void	resetCache()	Reset cached information here so that we can be sure we're accurate.
abstract void	resetPlaceHolderBuilder(ExpressionBuilder queryBuilder)	INTERNAL: Search the tree for any expressions (like SubSelectExpressions) that have been built using a builder that is not attached to the query.
Expression	reverse()	PUBLIC: Function return the reverse of the query result.
Expression	right(int characters)	PUBLIC: Function return a given number of characters starting at the right of a string.
Expression	right(Object characters)	PUBLIC: Function return a given number of characters starting at the right of a string.
Expression	rightPad(int size, Object substring)	PUBLIC: Function, returns the string padded with the substring to the size.
Expression	rightPad(Object size, Object substring)	PUBLIC: Function, returns the string padded with the substring to the size.
Expression	rightTrim()	PUBLIC: Function, returns the string right trimmed for white space.
Expression	rightTrim(Object substring)	PUBLIC: Function, returns the string with the substring trimed from the right.
Expression	roundDate(Object yearOrMonthOrDayRoundToken)	PUBLIC: Function, returns the date rounded to the year, month or day.
boolean	selectIfOrderedBy()	PUBLIC: Return whether this expression should be included in the SELECT clause if it is used in an ORDER BY clause
void	setLocalBase(Expression exp)	INTERNAL: Set the local base expression, ie the one on the other side of the operator Most types will ignore this, since they don't need it.
void	setSelectIfOrderedBy(boolean selectIfOrderedBy)	PUBLIC: Set whether this expression should be included in the SELECT clause of a query that uses it in the ORDER BY clause.
Expression	shallowClone()	INTERNAL:
Expression	size(Class returnType)	PUBLIC: A logical expression for the size of collection expression.
Expression	size(String attributeName)	PUBLIC: A logical expression for the size of collection attributeName.
Expression	some(boolean[] theBooleans)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	some(byte[] theBytes)	PUBLIC: Return an expression that is used with a comparison expression.
Expression	some(char[] theChars)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	some(double[] theDoubles)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	some(float[] theFloats)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	some(int[] theInts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	some(long[] theLongs)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	some(short[] theShorts)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	some(Object[] theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	some(List theObjects)	PUBLIC: Return an expression that checks if the receivers value is contained in the collection.
Expression	some(Expression arguments)
Expression	some(ReportQuery subQuery)
Expression	sql(String sql, List arguments)	ADVANCED: Parse the SQL for parameter and return a custom function expression using a custom operator that will print itself as the SQL.
Expression	standardDeviation()	PUBLIC: This represents the aggregate function StandardDeviation.
Expression	subQuery(ReportQuery subQuery)	PUBLIC: Return a sub query expression.
Expression	substring(int startPosition)	PUBLIC: Function, returns the substring from the source string.
Expression	substring(int startPosition, int size)	PUBLIC: Function, returns the substring from the source string.
Expression	substring(Object startPosition)	PUBLIC: Function, returns the substring from the source string.
Expression	substring(Object startPosition, Object size)	PUBLIC: Function, returns the substring from the source string.
Expression	sum()	PUBLIC: This represents the aggregate function Sum.
Expression	toChar()	PUBLIC: Return an expression that represents the receiver value converted to a character string.
Expression	toChar(String format)	PUBLIC: Return an expression that represents the receiver value converted to a character string, with the database formating options (i.e.
Expression	toCharacter()	PUBLIC: Function, returns the single character string with the ascii or character set value.
Expression	toDate()	PUBLIC: Function, returns date from the string using the default format.
Expression	toLowerCase()	PUBLIC: Return an expression that represents the receiver value converted to lower case.
Expression	toNumber()	PUBLIC: Function, returns the number converted from the string.
String	toString()	PUBLIC: Print a debug form of the expression tree.
void	toString(BufferedWriter writer, int indent)	INTERNAL: Print a debug form of the expression tree.
Expression	toUpperCase()	PUBLIC: Return an expression that represents the receiver value converted to upper case.
Expression	toUppercaseCasedWords()	PUBLIC: Function, returns the string with the first letter of each word capitalized.
Expression	translate(Object fromString, Object toString)	PUBLIC: Function, returns the string with each char from the from string converted to the char in the to string.
Expression	treat(Class castClass)	ADVANCED: Return an expression that allows you to treat its base as if it were a subclass of the class returned by the base This can only be called on an ExpressionBuilder, the result of expression.get(String), expression.getAllowingNull(String), the result of expression.anyOf("String") or the result of expression.anyOfAllowingNull("String") downcast uses Expression.type() internally to guarantee the results are of the specified class.
Expression	trim()	PUBLIC: Function, returns the string trimmed for white space.
Expression	trim(Object substring)	PUBLIC: Function, returns the string right and left trimmed for the substring.
Expression	truncateDate(String datePart)	PUBLIC: return the date truncated to the indicated datePart.
Expression	twist(Expression expression, Expression newBase)	INTERNAL: We are given an expression that comes from a different context than the one in which this was built, e.g.
Expression	twistedForBaseAndContext(Expression newBase, Expression context, Expression oldBase)	INTERNAL: Rebuild myself against the base, with the values of parameters supplied by the context expression.
Expression	type()	PUBLIC: Return an expression that wraps the inheritance type field in an expression.
Expression	union(Expression arguments)	PUBLIC: Return a union expression with the subquery.
Expression	union(ReportQuery query)	PUBLIC: Return a union expression with the subquery.
Expression	unionAll(Expression arguments)	PUBLIC: Return a union all expression with the subquery.
Expression	unionAll(ReportQuery query)	PUBLIC: Return a union all expression with the subquery.
void	validateNode()	INTERNAL: Do any required validation for this node.
Expression	value()	PUBLIC: Function, this represents the value function, used in nestedtable
Expression	value(boolean constant)	PUBLIC: Return an expression on the constant.
Expression	value(byte constant)	PUBLIC: Return an expression on the constant.
Expression	value(char constant)	PUBLIC: Return an expression on the constant.
Expression	value(double constant)	PUBLIC: Return an expression on the constant.
Expression	value(float constant)	PUBLIC: Return an expression on the constant.
Expression	value(int constant)	PUBLIC: Return an expression on the constant.
Expression	value(long constant)	PUBLIC: Return an expression on the constant.
Expression	value(short constant)	PUBLIC: Return an expression on the constant.
Expression	value(Object constant)	PUBLIC: Return an expression on the constant.
Object	valueFromObject(Object object, org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow, int valueHolderPolicy)	INTERNAL: Return the value for in memory comparison.
Object	valueFromObject(Object object, org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow, int valueHolderPolicy, boolean isObjectUnregistered)	INTERNAL: Return the value for in memory comparison.
Expression	variance()	PUBLIC: Function, this represents the aggregate function Variance.
protected void	writeAlias(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer, org.eclipse.persistence.internal.helper.DatabaseField field, org.eclipse.persistence.internal.expressions.SQLSelectStatement statement)	INTERNAL: Append the field's alias to the writer.
void	writeDescriptionOn(BufferedWriter writer)	INTERNAL: Used to print a debug form of the expression tree.
protected void	writeField(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer, org.eclipse.persistence.internal.helper.DatabaseField field, org.eclipse.persistence.internal.expressions.SQLSelectStatement statement)	INTERNAL: Append the field name to the writer.
void	writeFields(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer, List<org.eclipse.persistence.internal.helper.DatabaseField> newFields, org.eclipse.persistence.internal.expressions.SQLSelectStatement statement)	INTERNAL: called from SQLSelectStatement.writeFieldsFromExpression(...)
void	writeSubexpressionsTo(BufferedWriter writer, int indent)	INTERNAL: Used in SQL printing.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

lastTable

protected transient org.eclipse.persistence.internal.helper.DatabaseTable lastTable

Temporary values for table aliasing

currentAlias

protected transient org.eclipse.persistence.internal.helper.DatabaseTable currentAlias

selectIfOrderedBy

protected boolean selectIfOrderedBy

hashCode

protected int hashCode

PERF: Cache the hashCode.

shouldUseUpperCaseForIgnoreCase

public static boolean shouldUseUpperCaseForIgnoreCase

Use the upper() function for case insensitive expression operations (default). Seting this flag to false will use the lower() function instead.

Constructor Details

Expression

public Expression()

Base Expression Constructor. Not generally used by Developers

Method Details

addDate

public Expression addDate(String datePart,
 int numberToAdd)

PUBLIC: Function, return an expression that adds to a date based on the specified datePart. This is equivalent to the Sybase DATEADD function.

Example:

 EclipseLink: employee.get("date").addDate("year", 2)
 Java: NA
 SQL: DATEADD(date, 2, year)
 

addDate

public Expression addDate(String datePart,
 Object numberToAdd)

PUBLIC: Function, return an expression that adds to a date based on the specified datePart. This is equivalent to the Sybase DATEADD function.

Example:

 EclipseLink: employee.get("date").addDate("year", 2)
 Java: NA
 SQL: DATEADD(date, 2, year)
 

addMonths

public Expression addMonths(int months)

PUBLIC: Function, to add months to a date.

addMonths

public Expression addMonths(Object months)

PUBLIC: Function, to add months to a date.

aliasForTable

public org.eclipse.persistence.internal.helper.DatabaseTable aliasForTable(org.eclipse.persistence.internal.helper.DatabaseTable table)

INTERNAL: Find the alias for a given table

allOf

public Expression allOf(String attributeName,
 Expression criteria)

PUBLIC: Returns an expression equivalent to all of attributeName holding true for criteria.

For every expression with an anyOf, its negation has either an allOf or a noneOf. The following two examples will illustrate as the second is the negation of the first:

AnyOf Example: Employees with a non '613' area code phone number.

 ReadAllQuery query = new ReadAllQuery(Employee.class);
 ExpressionBuilder employee = new ExpressionBuilder();
 Expression exp = employee.anyOf("phoneNumbers").get("areaCode").notEqual("613");
 

AllOf Example: Employees with all '613' area code phone numbers.

 ExpressionBuilder employee = new ExpressionBuilder();
 ExpressionBuilder phones = new ExpressionBuilder();
 Expression exp = employee.allOf("phoneNumbers", phones.get("areaCode").equal("613"));
 SQL:
 SELECT ... EMPLOYEE t0 WHERE NOT EXISTS (SELECT ... PHONE t1 WHERE
                     (t0.EMP_ID = t1.EMP_ID) AND NOT (t1.AREACODE = '613'))
 

allOf is the universal counterpart to the existential anyOf. To have the condition evaluated for each instance it must be put inside of a subquery, which can be expressed as not exists (any of attributeName some condition). (All x such that y = !Exist x such that !y).

Likewise the syntax employee.allOf("phoneNumbers").get("areaCode").equal("613") is not supported for the

equal

must go inside a subQuery.

This method saves you from writing the sub query yourself. The above is equivalent to the following expression:

 ExpressionBuilder employee = new ExpressionBuilder();
 ExpressionBuilder phone = new ExpressionBuilder();
 ReportQuery subQuery = new ReportQuery(Phone.class, phone);
 subQuery.retreivePrimaryKeys();
 subQuery.setSelectionCriteria(phone.equal(employee.anyOf("phoneNumbers").and(
         phone.get("areaCode").notEqual("613")));
 Expression exp = employee.notExists(subQuery);
 

Note if employee has no phone numbers allOf ~ noneOf.

Parameters:

criteria - must have its own builder, as it will become the separate selection criteria of a subQuery.

Returns:

a notExists subQuery expression

and

public Expression and(Expression theExpression)

PUBLIC: Return an expression that is the boolean logical combination of both expressions. This is equivalent to the SQL "AND" operator and the Java "&&" operator.

Example:

  EclipseLink: employee.get("firstName").equal("Bob").and(employee.get("lastName").equal("Smith"))
  Java: (employee.getFirstName().equals("Bob")) && (employee.getLastName().equals("Smith"))
  SQL: F_NAME = 'Bob' AND L_NAME = 'Smith'
 

anyOf

public Expression anyOf(String attributeName)

PUBLIC: Return an expression representing traversal of a 1:many or many:many relationship. This allows you to query whether any of the "many" side of the relationship satisfies the remaining criteria.

Example:

This table compares an example EclipseLink anyOf Expression to Java and SQL

Format	Equivalent
EclipseLink	ReadAllQuery query = new ReadAllQuery(Employee.class); ExpressionBuilder builder = new ExpressionBuilder(); Expression exp = builder.get("id").equal("14858"); exp = exp.or(builder.anyOf("managedEmployees").get("firstName").equal("Bob"));
Java	No direct equivalent
SQL	SELECT DISTINCT ... WHERE (t2.MGR_ID (+) = t1.ID) AND (t2.F_NAME = 'Bob')

anyOf

public Expression anyOf(String attributeName,
 boolean shouldJoinBeIndependent)

ADVANCED: Return an expression representing traversal of a 1:many or many:many relationship. This allows you to query whether any of the "many" side of the relationship satisfies the remaining criteria.

Example:

This table compares an example EclipseLink anyOf Expression to Java and SQL

Format	Equivalent
EclipseLink	ReadAllQuery query = new ReadAllQuery(Employee.class); ExpressionBuilder builder = new ExpressionBuilder(); Expression exp = builder.get("id").equal("14858"); exp = exp.or(builder.anyOf("managedEmployees").get("firstName").equal("Bob"));
Java	No direct equivalent
SQL	SELECT DISTINCT ... WHERE (t2.MGR_ID (+) = t1.ID) AND (t2.F_NAME = 'Bob')

Parameters:

shouldJoinBeIndependent - indicates whether a new expression should be created.

anyOfAllowingNone

public Expression anyOfAllowingNone(String attributeName)

ADVANCED: Return an expression representing traversal of a 1:many or many:many relationship. This allows you to query whether any of the "many" side of the relationship satisfies the remaining criteria. This version of the anyOf operation performs an outer join. Outer joins allow the join to performed even if the target of the relationship is empty. NOTE: outer joins are not supported on all database and have differing semantics.

Example:

This table compares an example EclipseLink anyOfAllowingNone Expression to Java and SQL

Format	Equivalent
EclipseLink	ReadAllQuery query = new ReadAllQuery(Employee.class); ExpressionBuilder builder = new ExpressionBuilder(); Expression exp = builder.get("id").equal("14858"); exp = exp.or(builder.anyOfAllowingNone("managedEmployees").get("firstName").equal("Bob"));
Java	No direct equivalent
SQL	SELECT DISTINCT ... WHERE (t2.MGR_ID (+) = t1.ID) AND (t2.F_NAME = 'Bob')

anyOfAllowingNone

public Expression anyOfAllowingNone(String attributeName,
 boolean shouldJoinBeIndependent)

ADVANCED: Return an expression representing traversal of a 1:many or many:many relationship. This allows you to query whether any of the "many" side of the relationship satisfies the remaining criteria. This version of the anyOf operation performs an outer join. Outer joins allow the join to performed even if the target of the relationship is empty. NOTE: outer joins are not supported on all database and have differing semantics.

Example:

This table compares an example EclipseLink anyOfAllowingNone Expression to Java and SQL

Format	Equivalent
EclipseLink	ReadAllQuery query = new ReadAllQuery(Employee.class); ExpressionBuilder builder = new ExpressionBuilder(); Expression exp = builder.get("id").equal("14858"); exp = exp.or(builder.anyOfAllowingNone("managedEmployees").get("firstName").equal("Bob"));
Java	No direct equivalent
SQL	SELECT DISTINCT ... WHERE (t2.MGR_ID (+) = t1.ID) AND (t2.F_NAME = 'Bob')

Parameters:

shouldJoinBeIndependent - indicates whether a new expression should be created.

as

public Expression as(String alias)

ADVANCED: Assign an alias to the expression in the select clause.

treat

public Expression treat(Class castClass)

ADVANCED: Return an expression that allows you to treat its base as if it were a subclass of the class returned by the base This can only be called on an ExpressionBuilder, the result of expression.get(String), expression.getAllowingNull(String), the result of expression.anyOf("String") or the result of expression.anyOfAllowingNull("String") downcast uses Expression.type() internally to guarantee the results are of the specified class.

Example:

     EclipseLink: employee.get("project").treat(LargeProject.class).get("budget").equal(1000)
     Java: ((LargeProject)employee.getProjects().get(0)).getBudget() == 1000
     SQL: LPROJ.PROJ_ID (+)= PROJ.PROJ_ID AND L_PROJ.BUDGET = 1000 AND PROJ.TYPE = "L"
 

ascending

public Expression ascending()

PUBLIC: This can only be used within an ordering expression. It will order the result ascending. Example:

  readAllQuery.addOrderBy(expBuilder.get("address").get("city").ascending())
 

nullsFirst

public Expression nullsFirst()

PUBLIC: This can only be used within an ordering expression. Null results will be ordered first. Example:

  readAllQuery.addOrderBy(expBuilder.get("address").get("city").ascending().nullsFirst())
 

nullsLast

public Expression nullsLast()

PUBLIC: This can only be used within an ordering expression. Null results will be ordered last. Example:

  readAllQuery.addOrderBy(expBuilder.get("address").get("city").ascending().nullsLast())
 

asciiValue

public Expression asciiValue()

PUBLIC: Function, returns the single character strings ascii value.

asOf

public Expression asOf(AsOfClause pastTime)

Sets all tables represented by this expression to be queried as of a past time.

Example:

  EclipseLink: employee.asOf(new AsOfClause(pastTime))
  Java: None
  SQL (Flashback): SELECT ... FROM EMPLOYEE AS OF TIMESTAMP (pastTime) t0 ...
  SQL (Generic): .. WHERE (t1.START <= pastTime) AND ((t1.END IS NULL) OR t1.END > pastTime)
 

Set an as of clause at the expression level to still query for current objects while expressing selection criteria like:

• query objects as of one time that met some condition at another time.
• query objects that changed a certain way over a certain interval (querying for change).

Simultaneously querying on two versions of the same object (one past one present) lets you express these advanced selection criteria.

Example: Querying on past attributes using parallel expressions.

   // Finds all employees who lived in Ottawa as of a past time.
   ExpressionBuilder employee = new ExpressionBuilder();
   ExpressionBuilder pastEmployee = new ExpressionBuilder(Employee.class);
   pastEmployee.asOf(pastTime);
   Expression pastAddress = pastEmployee.get("address"); // by default address will also be as of past time.
   Expression selectionCriteria = pastAddress.get("city").equal("Ottawa").and(
       employee.equal(pastEmployee));
 

The advantage of the parallel expression is that you can still read current objects, the as of clause will affect only the where clause / selection criteria.

You may be tempted to rewrite the above as employee.get("address").asOf(pastTime). That is allowed but see below for the finer points involved in this.

Example: Querying on object changes using parallel expressions.

   // Finds all employees who recently received a raise.  Note that current
   // objects are returned, so can be cached normally.
   ExpressionBuilder employee = new ExpressionBuilder();
   Expression pastEmployee = new ExpressionBuilder(Employee.class);
   pastEmployee.asOf(yesterday);
   Expression parallelJoin = employee.equal(pastEmployee);
   Expression selectionCriteria = parallelJoin.and(
       employee.get("salary").greaterThan(pastEmployee.get("salary")));
 

Example: Querying on object changes using custom query keys

   // First define the custom query key and add it to your descriptor.
   ExpressionBuilder builder = new ExpressionBuilder(Employee.class);
   Expression joinCriteria = builder.getField("EMPLOYEE.EMP_ID").equal(builder.getParameter("EMPLOYEE.EMP_ID"));
   OneToOneQueryKey selfReferential = new OneToOneQueryKey();
   selfReferential.setName("this");
   selfReferential.setJoinCriteria(joinCriteria);
   selfReferential.setReferenceClass(Employee.class);
   getSession().getDescriptor(Employee.class).addQueryKey(selfReferential);

   // Now build query as before.
   Expression employee = new ExpessionBuilder();
   Expression pastEmployee = employee.get("this").asOf(yesterday);
   Expression selectionCriteria = employee.get("salary").greaterThan(pastEmployee.get("salary"));
 

Note in general that any parallel expression can be rewritten using a custom query key. EclipseLink will even automatically interpret x.get("this") for you so you do not need to define the above query key first.

Full Reference:

If an object is mapped to multiple tables, then each table will be as of the same time. Two objects mapped to the same table can not have different as of times. Conversely only expressions which have associated tables can have an as of clause.

If an as of clause is not explicitly set an expression will use the clause of its base expression, and so on recursively until one is found or an ExpressionBuilder is reached. Some usage scenarios follow:

• employee.asOf(pastTime).anyOf("projects"): projects as of past time.
• expressionBuilder.asOf(pastTime): entire expression as of past time.
• employee.asOf(pastTime).anyOf("projects").asOf(null): projects as of current time.
• employee.anyOf("projects").asOf(pastTime): projects only as of past time.

Watch out for x.asOf(oneTime).get("y").asOf(anotherTime).

• emp.anyOf("phoneNumbers").asOf(yesterday) = emp.asOf(yesterday).anyOf("phoneNumbers") but:
• emp.get("address").asOf(yesterday) != emp.asOf(yesterday).get("address").

Whether the join is also as of yesterday depends on which table the foreign key field resides on. In an anyOf the foreign key is always on the right, but in a get (1-1) it could be on either side. For this reason employee.get("address").asOf(yesterday) is undefined as it can mean either 'my address as of yesterday', or 'my address, as of yesterday.'

Parameters:

pastTime - A read only data object used to represent a past time.

Returns:

this

See Also:

• AsOfClause
• hasAsOfClause()
• Session.acquireHistoricalSession(org.eclipse.persistence.history.AsOfClause)
• ObjectLevelReadQuery.setAsOfClause(org.eclipse.persistence.history.AsOfClause)

assignAlias

protected void assignAlias(String name,
 org.eclipse.persistence.internal.helper.DatabaseTable tableOrExpression)

INTERNAL: Alias a particular table within this node

assignTableAliasesStartingAt

public int assignTableAliasesStartingAt(int initialValue)

INTERNAL: Assign aliases to any tables which I own. Start with t(initialValue), and return the new value of the counter , i.e. if initialValue is one and I have tables ADDRESS and EMPLOYEE I will assign them t1 and t2 respectively, and return 3.

average

public Expression average()

PUBLIC: Function, This represents the aggregate function Average. Can be used only within Report Queries.

between

public Expression between(byte leftValue,
 byte rightValue)

PUBLIC: Function, between two bytes

between

public Expression between(char leftChar,
 char rightChar)

PUBLIC: Function, between two chars

between

public Expression between(double leftValue,
 double rightValue)

PUBLIC: Function, between two doubles

between

public Expression between(float leftValue,
 float rightValue)

PUBLIC: Function, between two floats

between

public Expression between(int leftValue,
 int rightValue)

PUBLIC: Function, between two ints

between

public Expression between(long leftValue,
 long rightValue)

PUBLIC: Function, between two longs

between

public Expression between(Object leftValue,
 Object rightValue)

PUBLIC: Return an expression that compares if the receiver's value is between two other values. This means the receiver's value is greater than or equal to the leftValue argument and less than or equal to the rightValue argument.

This is equivalent to the SQL "BETWEEN AND" operator and Java ">=", "<=;" operators.

Example:

     EclipseLink: employee.get("age").between(19,50)
     Java: (employee.getAge() >= 19) && (employee.getAge() <= 50)
     SQL: AGE BETWEEN 19 AND 50
 

between

public Expression between(Expression leftExpression,
 Expression rightExpression)

between

public Expression between(short leftValue,
 short rightValue)

PUBLIC: Function, between two shorts

caseStatement

public Expression caseStatement(Map caseItems,
 Object defaultItem)

PUBLIC: Function Convert values returned by the query to values given in the caseItems Map. The equivalent of the Oracle CASE function

Example:

 Map caseTable = new HashMap();
 caseTable.put("Robert", "Bob");
 caseTable.put("Susan", "Sue");

 EclipseLink: employee.get("name").caseStatement(caseTable, "No-Nickname")
 Java: NA
 SQL: CASE name WHEN "Robert" THEN "Bob"
     WHEN "Susan" THEN "Sue"
  ELSE "No-Nickname"
 

Parameters:

caseItems - java.util.Map A Map containing the items to be processed. Keys represent the items to match coming from the query. Values represent what a key will be changed to.

defaultItem - java.lang.String the default value that will be used if none of the keys in the hashtable match

caseStatement

public org.eclipse.persistence.internal.expressions.ArgumentListFunctionExpression caseStatement()

INTERNAL: Creates an ArgumentListFunctionExpression that is capable of creating a case statement of the form:

 SQL: CASE name WHEN "Robert" THEN "Bob"
     WHEN "Susan" THEN "Sue"
  ELSE "No-Nickname"
 

This expression must be manipulated to successfully build a case statement by adding appropriate children to it. A child must be added for the "case expression" (name above), a pair of children must be added for each "when then" expression and a child must be added for the else.

See Also:

• ArgumentListFunctionExpression

caseConditionStatement

public Expression caseConditionStatement(Map<Expression,Object> caseConditions,
 Object defaultItem)

PUBLIC: Function Convert values returned by the query to values given in the caseConditions Map. The equivalent of the SQL CASE function

Example:

 Map caseTable = new HashMap();
 caseTable.put(employee.get("name").equals("Robert"), "Bob");
 caseTable.put(employee.get("name").equals("Susan"), "Sue");

 EclipseLink: expressionBuilder.caseConditionStatement(caseTable, "No-Nickname")
 Java: NA
 SQL: CASE WHEN name = "Robert" THEN "Bob"
     WHEN name = "Susan" THEN "Sue"
  ELSE "No-Nickname"
 

Parameters:

caseConditions - java.util.Map A Map containing the items to be processed. Keys represent the items to match coming from the query. Values represent what a key will be changed to.

defaultItem - java.lang.Object the default value that will be used if none of the keys in the Map match

caseConditionStatement

public org.eclipse.persistence.internal.expressions.ArgumentListFunctionExpression caseConditionStatement()

INTERNAL: Creates an ArgumentListFunctionExpression that is capable of creating a case statement of the form:

 SQL: CASE WHEN name = "Robert" THEN "Bob"
     WHEN name = "Susan" THEN "Sue"
  ELSE "No-Nickname"
 

This expression must be manipulated to successfully build a case statement by adding appropriate children to it. A pair of children must be added for each "when then" expression and a child must be added for the else.

See Also:

• ArgumentListFunctionExpression

nullIf

public Expression nullIf(Object object)

PUBLIC: Function Test if arguments are equal, returning null if they are and the value of the first expression otherwise.

Example:

 EclipseLink: builder.get("name").nullIf( "Bobby")
 Java: NA
 SQL: NULLIF(name, "Bobby")
 

Parameters:

object - java.lang.Object the value/expression that will be compared to the base expression

coalesce

public org.eclipse.persistence.internal.expressions.ArgumentListFunctionExpression coalesce(Collection expressions)

PUBLIC: Function Return null if all arguments are null and the first non-null argument otherwise The equivalent of the COALESCE SQL function

Example:

 List list = new ArrayList(3);
 list.add(builder.get("firstName"));
 list.add(builder.get("lastName"));
 list.add(builder.get("nickname"));

 EclipseLink: expressionBuilder.coalesce(caseTable)
 Java: NA
 SQL: COALESCE(firstname, lastname, nickname)
 

Parameters:

expressions - java.util.Collection A Collection containing the items to check if null

coalesce

public org.eclipse.persistence.internal.expressions.ArgumentListFunctionExpression coalesce()

clone

public Object clone()

INTERNAL: Clone the expression maintaining clone identity in the inter-connected expression graph.

Overrides:

clone in class Object

cloneUsing

public Expression cloneUsing(Expression newBase)

INTERNAL: This expression is built on a different base than the one we want. Rebuild it and return the root of the new tree. This method will rebuildOn the receiver even it is a parallel select or a sub select: it will not replace every base with newBase. Also it will rebuild using anyOf as appropriate not get.

See Also:

• ForeignReferenceMapping.batchedValueFromRow(org.eclipse.persistence.internal.sessions.AbstractRecord, org.eclipse.persistence.queries.ObjectLevelReadQuery, org.eclipse.persistence.internal.identitymaps.CacheKey)
• rebuildOn(Expression)

concat

public Expression concat(Object left)

PUBLIC: Function, returns the concatenation of the two string values.

containsAllKeyWords

public Expression containsAllKeyWords(String spaceSeparatedKeyWords)

PUBLIC: Return an expression that performs a key word search.

Example:

     EclipseLink: project.get("description").containsAllKeyWords("EclipseLink rdbms java")
 

containsAnyKeyWords

public Expression containsAnyKeyWords(String spaceSeparatedKeyWords)

PUBLIC: Return an expression that performs a key word search.

Example:

     EclipseLink: project.get("description").containsAllKeyWords("EclipseLink rdbms java")
 

containsSubstring

public Expression containsSubstring(String theValue)

PUBLIC: Return an expression that compares if the receivers value contains the substring.

Example:

     EclipseLink: employee.get("firstName").containsSubstring("Bob")
     Java: employee.getFirstName().indexOf("Bob") != -1
     SQL: F_NAME LIKE '%BOB%'
 

containsSubstring

public Expression containsSubstring(Expression expression)

PUBLIC: Return an expression that compares if the receivers value contains the substring.

Example:

     EclipseLink: employee.get("firstName").containsSubstring("Bob")
     Java: employee.getFirstName().indexOf("Bob") != -1
     SQL: F_NAME LIKE '%BOB%'
 

containsSubstringIgnoringCase

public Expression containsSubstringIgnoringCase(String theValue)

PUBLIC: Return an expression that compares if the receivers value contains the substring, ignoring case.

Example:

     EclipseLink: employee.get("firstName").containsSubstringIgnoringCase("Bob")
     Java: employee.getFirstName().toUpperCase().indexOf("BOB") != -1
     SQL: UPPER(F_NAME) LIKE '%BOB%'
 

containsSubstringIgnoringCase

public Expression containsSubstringIgnoringCase(Expression expression)

PUBLIC: Return an expression that compares if the receivers value contains the substring, ignoring case.

Example:

     EclipseLink: employee.get("firstName").containsSubstringIgnoringCase("Bob")
     Java: employee.getFirstName().toUpperCase().indexOf("BOB") != -1
     SQL: UPPER(F_NAME) LIKE '%BOB%'
 

convertNodeToUseOuterJoin

protected void convertNodeToUseOuterJoin()

convertToUseOuterJoin

public Expression convertToUseOuterJoin()

INTERNAL: Modify this expression to use outer joins wherever there are equality operations between two field nodes.

copiedVersionFrom

public Expression copiedVersionFrom(Map alreadyDone)

INTERNAL:

count

public Expression count()

PUBLIC: This represents the aggregate function Average. Can be used only within Report Queries.

create

public Expression create(Expression base,
 Object singleArgument,
 ExpressionOperator anOperator)

INTERNAL:

createWithBaseLast

public Expression createWithBaseLast(Expression base,
 Object singleArgument,
 ExpressionOperator anOperator)

INTERNAL:

create

public Expression create(Expression base,
 List arguments,
 ExpressionOperator anOperator)

INTERNAL:

currentTimeStamp

public Expression currentTimeStamp()

PUBLIC: This gives access to the current timestamp on the database through expression. Please note, this method is added for consistency and returns the same result as currentDate.

currentDate

public Expression currentDate()

PUBLIC: This gives access to the current date on the database through expression.

currentDateDate

public Expression currentDateDate()

PUBLIC: This gives access to the current date only on the database through expression. Note the difference between currentDate() and this method. This method does not return the time portion of current date where as currentDate() does.

currentTime

public Expression currentTime()

PUBLIC: This gives access to the current time only on the database through expression. Note the difference between currentDate() and this method. This method does not return the date portion where as currentDate() does.

dateDifference

public Expression dateDifference(String datePart,
 Date date)

PUBLIC: Function, Return the difference between the queried part of a date(i.e. years, days etc.) and same part of the given date. The equivalent of the Sybase function DateDiff

Example:

 EclipseLink: employee.get("date").dateDifference("year", new Date(System.currentTimeMillis()))
 Java: NA
 SQL: DATEADD(date, 2, GETDATE)
 

dateDifference

public Expression dateDifference(String datePart,
 Expression comparisonExpression)

PUBLIC: Function, Return the difference between the queried part of a date(i.e. years, days etc.) and same part of the given date. The equivalent of the Sybase function DateDiff

Example:

 EclipseLink: employee.get("date").dateDifference("year", new Date(System.currentTimeMillis()))
 Java: NA
 SQL: DATEADD(date, 2, GETDATE)
 

dateName

public Expression dateName(String datePart)

PUBLIC: return a string that represents the given part of a date. The equivalent of the Sybase DATENAME function

Example:

 EclipseLink: employee.get("date").dateName("year")
 Java: new String(date.getYear())
 SQL: DATENAME(date, year)
 

datePart

public Expression datePart(String datePart)

PUBLIC: Function return an integer which represents the requested part of the date. Equivalent of the Sybase function DATEPART

Example:

 EclipseLink: employee.get("date").datePart("year")
 Java: date.getYear()
 SQL: DATEPART(date, year)
 

dateToString

public Expression dateToString()

PUBLIC: Function, returns the date converted to the string value in the default database format.

decode

public Expression decode(Map decodeableItems,
 String defaultItem)

PUBLIC: Function Convert values returned by the query to values given in the decodeableItems Map. The equivalent of the Oracle DECODE function. Note: This will only work on databases that support Decode with the syntax below.

Example:

 Map decodeTable = new HashMap();
 decodeTable.put("Robert", "Bob");
 decodeTable.put("Susan", "Sue");

 EclipseLink: employee.get("name").Decode(decodeTable, "No-Nickname")
 Java: NA
 SQL: DECODE(name, "Robert", "Bob", "Susan", "Sue", "No-Nickname")
 

Parameters:

decodeableItems - java.util.Map a Map containing the items to be decoded. Keys represent the items to match coming from the query. Values represent what a key will be changed to.

defaultItem - the default value that will be used if none of the keys in the Map match

descending

public Expression descending()

PUBLIC: This can only be used within an ordering expression. It will order the result descending.

Example:

 readAllQuery.addOrderBy(expBuilder.get("address").get("city").descending())
 

descriptionOfNodeType

public String descriptionOfNodeType()

INTERNAL: Used in debug printing of this node.

difference

public Expression difference(String expression)

PUBLIC: Function return a value which indicates how much difference there is between two expressions. Equivalent of the Sybase DIFFERENCE function

Example:

 EclipseLink: employee.get("name").difference("Frank")
 SQL: DIFFERENCE(name, 'Frank')
 

distinct

public Expression distinct()

PUBLIC: Function, This represents the distinct option inside an aggregate function. Can be used only within Report Queries.

doesConform

public boolean doesConform(Object object,
 org.eclipse.persistence.internal.sessions.AbstractSession session,
 org.eclipse.persistence.internal.sessions.AbstractRecord translationRow,
 int valueHolderPolicy)
                    throws QueryException

INTERNAL: Check if the object conforms to the expression in memory. This is used for in-memory querying. By default throw an exception as all valid root expressions must override. If the expression in not able to determine if the object conform throw a not supported exception.

Throws:

QueryException

doesConform

public boolean doesConform(Object object,
 org.eclipse.persistence.internal.sessions.AbstractSession session,
 org.eclipse.persistence.internal.sessions.AbstractRecord translationRow,
 int valueHolderPolicy,
 boolean objectIsUnregistered)
                    throws QueryException

INTERNAL: New parameter added to doesConform for feature 2612601

Parameters:

objectIsUnregistered - true if object possibly not a clone, but is being conformed against the unit of work cache; if object is not in the UOW cache but some of its attributes are, use the registered versions of object's attributes for the purposes of this method.

Throws:

QueryException

equals

public boolean equals(Object expression)

INTERNAL: Return if the expression is equal to the other. This is used to allow dynamic expression's SQL to be cached. Two expressions should be considered equal if they have the same "parameterized" SQL. This must be over written by each subclass.

Overrides:

equals in class Object

hashCode

public int hashCode()

INTERNAL: Return a consistent hash-code for the expression. This is used to allow dynamic expression's SQL to be cached. Two expressions should have the same hashCode if they have the same "parameterized" SQL. This should be over written by each subclass to provide a consistent value.

Overrides:

hashCode in class Object

computeHashCode

public int computeHashCode()

INTERNAL: Compute a consistent hash-code for the expression. This is used to allow dynamic expression's SQL to be cached. Two expressions should have the same hashCode if they have the same "parameterized" SQL. This should be over written by each subclass to provide a consistent value.

equal

public Expression equal(byte theValue)

equal

public Expression equal(char theChar)

equal

public Expression equal(double theValue)

equal

public Expression equal(float theValue)

equal

public Expression equal(int theValue)

equal

public Expression equal(long theValue)

equal

public Expression equal(Object theValue)

PUBLIC: Return an expression that compares if the receiver's value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

Example:

     EclipseLink: employee.get("firstName").equal("Bob")
     Java: employee.getFirstName().equals("Bob")
     SQL: F_NAME = 'Bob'
 

equal

public Expression equal(Expression theValue)

Returns an expression that compares if the receiver's value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

Since OracleAS EclipseLink 10g (9.0.4) if this is an ExpressionBuilder and theValue is not used elsewhere, both will be translated to the same table. This can generate SQL with one less join for most exists subqueries.

Example:

     EclipseLink: employee.get("manager").equal(employee)
     Java: employee.getManager().equals(employee)
     SQL (optimized): EMP_ID = MANAGER_ID
     SQL (unoptimized): t0.MANAGER_ID = t1.EMP_ID AND t0.EMP_ID = t1.EMP_ID
 

See Also:

• equal(Object)

equal

public Expression equal(short theValue)

equal

public Expression equal(boolean theBoolean)

equalOuterJoin

public Expression equalOuterJoin(Object theValue)

INTERNAL: Return an expression representing an outer join comparison

equalOuterJoin

public Expression equalOuterJoin(Expression theValue)

INTERNAL: Return an expression representing an outer join comparison

equalsIgnoreCase

public Expression equalsIgnoreCase(String theValue)

PUBLIC: Return an expression that compares if the receiver's value is equal to the other value, ignoring case. This is equivalent to the Java "equalsIgnoreCase" method.

Example:

     EclipseLink: employee.get("firstName").equalsIgnoreCase("Bob")
     Java: employee.getFirstName().equalsIgnoreCase("Bob")
     SQL: UPPER(F_NAME) = 'BOB'
 

equalsIgnoreCase

public Expression equalsIgnoreCase(Expression theValue)

PUBLIC: Return an expression that compares if the receiver's value is equal to the other value, ignoring case. This is equivalent to the Java "equalsIgnoreCase" method.

Example:

     EclipseLink: employee.get("firstName").equalsIgnoreCase("Bob")
     Java: employee.getFirstName().equalsIgnoreCase("Bob")
     SQL: UPPER(F_NAME) = 'BOB'
 

exists

public Expression exists(ReportQuery subQuery)

PUBLIC: Return a sub query expression. A sub query using a report query to define a subselect within another queries expression or select's where clause. The sub query (the report query) will use its own expression builder be can reference expressions from the base expression builder.

Example:

 ExpressionBuilder builder = new ExpressionBuilder();
 ReportQuery subQuery = new ReportQuery(Employee.class, new ExpressionBuilder());
 subQuery.setSelectionCriteria(subQuery.getExpressionBuilder().get("name").equal(builder.get("name")));
 builder.exists(subQuery);
 

extractPrimaryKeyValues

public boolean extractPrimaryKeyValues(boolean requireExactMatch,
 ClassDescriptor descriptor,
 org.eclipse.persistence.internal.sessions.AbstractRecord primaryKeyRow,
 org.eclipse.persistence.internal.sessions.AbstractRecord translationRow)

INTERNAL: Extract the primary key from the expression into the row. Ensure that the query is querying the exact primary key. Return false if not on the primary key.

extractValues

public boolean extractValues(boolean primaryKeyOnly,
 boolean requireExactMatch,
 ClassDescriptor descriptor,
 org.eclipse.persistence.internal.sessions.AbstractRecord primaryKeyRow,
 org.eclipse.persistence.internal.sessions.AbstractRecord translationRow)

INTERNAL: Extract the primary key from the expression into the row. Ensure that the query is querying the exact primary key. Return false if not on the primary key.

extractFields

public boolean extractFields(boolean requireExactMatch,
 boolean primaryKey,
 ClassDescriptor descriptor,
 List<org.eclipse.persistence.internal.helper.DatabaseField> searchFields,
 Set<org.eclipse.persistence.internal.helper.DatabaseField> foundFields)

INTERNAL: Return if the expression is not a valid primary key expression and add all primary key fields to the set.

from

public static Expression from(Object value,
 Expression base)

INTERNAL: Create an expression node.

fromConstant

public static Expression fromConstant(Object value,
 Expression base)

INTERNAL: Create an expression node.

fromLiteral

public static Expression fromLiteral(String value,
 Expression base)

INTERNAL: Create an expression node.

get

public Expression get(String attributeName)

PUBLIC: Return an expression that wraps the attribute or query key name. This method is used to construct user-defined queries containing joins.

Example:

  builder.get("address").get("city").equal("Ottawa");
 

get

public Expression get(String attributeName,
 boolean forceInnerJoin)

PUBLIC: Return an expression that wraps the attribute or query key name. This method is used to construct user-defined queries containing joins.

Example:

  builder.get("address", false).get("city").equal("Ottawa");
 

Parameters:

forceInnerJoin - - allows the get to not force an inner-join (if getAllowingNull was used elsewhere).

getAllowingNull

public Expression getAllowingNull(String attributeName)

ADVANCED: Return an expression that wraps the attribute or query key name. This is only applicable to 1:1 relationships, and allows the target of the relationship to be null if there is no corresponding relationship in the database. Implemented via an outer join in the database.

Example:

  builder.getAllowingNull("address").get("city").equal("Ottawa");
 

getAsOfClause

public AsOfClause getAsOfClause()

Answers the past time the expression is explicitly as of.

Returns:

An immutable object representation of the past time. null if no clause set, AsOfClause.NO_CLAUSE if clause explicitly set to null.

See Also:

• asOf(org.eclipse.persistence.history.AsOfClause)
• hasAsOfClause()

getAsOfClauseRecursively

public AsOfClause getAsOfClauseRecursively()

INTERNAL: For Flashback: If this expression is not already as of some timestamp gets the clause from the base expression. Allows a clause to be set only on the builder and then propogated during normalize.

getBuilder

public abstract ExpressionBuilder getBuilder()

INTERNAL: Return the expression builder which is the ultimate base of this expression, or null if there isn't one (shouldn't happen if we start from a root)

getClonedField

public org.eclipse.persistence.internal.helper.DatabaseField getClonedField()

INTERNAL: If there are any fields associated with this expression, return them

getField

public Expression getField(String fieldName)

ADVANCED: Return an expression representing a field in a data-level query. This is used internally in EclipseLink, or to construct queries involving fields and/or tables that are not mapped.

Example:

  builder.getField("ADDR_ID").greaterThan(100);
  builder.getTable("PROJ_EMP").getField("TYPE").equal("S");
 

getField

public Expression getField(org.eclipse.persistence.internal.helper.DatabaseField field)

ADVANCED: Return an expression representing a field in a data-level query. This is used internally in EclipseLink, or to construct queries involving fields and/or tables that are not mapped.

Example:

  builder.getField(aField).greaterThan(100);
 

getFields

public List<org.eclipse.persistence.internal.helper.DatabaseField> getFields()

INTERNAL:

getSelectionFields

public List<org.eclipse.persistence.internal.helper.DatabaseField> getSelectionFields()

INTERNAL:

getSelectionFields

public List<org.eclipse.persistence.internal.helper.DatabaseField> getSelectionFields(ReadQuery query)

getFieldValue

public Object getFieldValue(Object objectValue,
 org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: Transform the object-level value into a database-level value

join

public Expression join(Expression target,
 Expression onClause)

ADVANCED: Defines a join between the two objects based on the specified ON clause. This can be used to define a join condition on two unrelated objects, or to qualify a relationship join with additional criteria.

Example:

  Expression address = employee.getAllowingNull("address");
  employee.join(address, address.get("city").equal("Ottawa"));
  query.addNonFetchJoin(address);
 

leftJoin

public Expression leftJoin(Expression target,
 Expression onClause)

ADVANCED: Defines an outer join between the two objects based on the specified ON clause. This can be used to define a join condition on two unrelated objects, or to qualify a relationship join with additional criteria.

Example:

  Expression address = employee.getAllowingNull("address");
  employee.leftJoin(address, address.get("city").equal("Ottawa"));
  query.addNonFetchJoin(address);
 

getFunction

public Expression getFunction(int selector)

ADVANCED: This can be used for accessing user defined functions. The operator must be defined in ExpressionOperator to be able to reference it.

See Also:

• Example:

    builder.get("name").getFunction(MyFunctions.FOO_BAR).greaterThan(100);
   

getFunction

public Expression getFunction(int selector,
 List arguments)

ADVANCED: This can be used for accessing user defined functions that have arguments. The operator must be defined in ExpressionOperator to be able to reference it.

See Also:

• Example:

      List arguments = new ArrayList();
      arguments.add("blee");
    builder.get("name").getFunction(MyFunctions.FOO_BAR, arguments).greaterThan(100);
   

operator

public Expression operator(String name,
 List arguments)

ADVANCED: This can be used for accessing user defined operators that have arguments. The operator must be defined in ExpressionOperator to be able to reference it.

See Also:

• Example:

    List arguments = new ArrayList();
    arguments.add("blee");
    builder.get("name").operator("FOO_BAR", arguments).greaterThan(100);
   

getFunction

public Expression getFunction(String functionName)

ADVANCED: Return a user defined function accepting the argument. The function is assumed to be a normal prefix function and will print like, UPPER(base).

Example:

  builder.get("firstName").getFunction("UPPER");
 

getFunction

public Expression getFunction(String functionName,
 Object argument)

ADVANCED: Return a user defined function accepting the argument. The function is assumed to be a normal prefix function and will print like, CONCAT(base, argument).

getFunctionWithArguments

public Expression getFunctionWithArguments(String functionName,
 List arguments)

ADVANCED: Return a user defined function accepting all of the arguments. The function is assumed to be a normal prefix function like, CONCAT(base, value1, value2, value3, ...).

sql

public Expression sql(String sql,
 List arguments)

ADVANCED: Parse the SQL for parameter and return a custom function expression using a custom operator that will print itself as the SQL. Arguments are passed using '?', and must match the number of arguments.

type

public Expression type()

PUBLIC: Return an expression that wraps the inheritance type field in an expression.

Example:

  builder.getClassForInheritance().equal(SmallProject.class);
  builder.anyOf("projects").getClassForInheritance().equal(builder.getParameter("projectClass"));
 

getName

public String getName()

INTERNAL:

getOperator

public ExpressionOperator getOperator()

INTERNAL: Most expression have operators, so this is just a convenience method.

getOperator

public static ExpressionOperator getOperator(int selector)

INTERNAL: Create a new expression tree with the named operator. Part of the implementation of user-level "get"

getOwnedTables

public List<org.eclipse.persistence.internal.helper.DatabaseTable> getOwnedTables()

INTERNAL: Return the tables that this node owns for purposes of table aliasing.

getParameter

public Expression getParameter(String parameterName,
 Object type)

INTERNAL: Return an expression representing a parameter with the given name and type

getParameter

public Expression getParameter(String parameterName)

ADVANCED: Return an expression representing a parameter with the given name.

getParameter

public Expression getParameter(org.eclipse.persistence.internal.helper.DatabaseField field)

ADVANCED: Return an expression representing a parameter with the given name.

getProperty

public Expression getProperty(org.eclipse.persistence.internal.helper.DatabaseField field)

ADVANCED: Return an expression representing a property with the given name.

getSession

public org.eclipse.persistence.internal.sessions.AbstractSession getSession()

INTERNAL:

getTable

public Expression getTable(String tableName)

ADVANCED: Return an expression representing a table in a data-level query. This is used internally in EclipseLink, or to construct queries involving fields and/or tables that are not mapped.

Example:

  builder.getTable("PROJ_EMP").getField("TYPE").equal("S");
 

getTable

public Expression getTable(org.eclipse.persistence.internal.helper.DatabaseTable table)

ADVANCED: Return an expression representing a table in a data-level query. This is used internally in EclipseLink, or to construct queries involving fields and/or tables that are not mapped.

Example:

  builder.getTable(linkTable).getField("TYPE").equal("S");
 

getAlias

public Expression getAlias(Expression subSelect)

ADVANCED: Return an expression representing a sub-select in the from clause.

Example:

  builder.getAlias(builder.subQuery(reportQuery)).get("type").equal("S");
 

getTableAliases

public org.eclipse.persistence.internal.expressions.TableAliasLookup getTableAliases()

INTERNAL: Return the aliases used. By default, return null, since we don't have tables.

greaterThan

public Expression greaterThan(byte theValue)

PUBLIC: Return an expression that compares if the receivers value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

greaterThan

public Expression greaterThan(char theChar)

PUBLIC: Return an expression that compares if the receivers value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

greaterThan

public Expression greaterThan(double theValue)

PUBLIC: Return an expression that compares if the receivers value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

greaterThan

public Expression greaterThan(float theValue)

PUBLIC: Return an expression that compares if the receivers value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

greaterThan

public Expression greaterThan(int theValue)

PUBLIC: Return an expression that compares if the receivers value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

greaterThan

public Expression greaterThan(long theValue)

PUBLIC: Return an expression that compares if the receivers value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

greaterThan

public Expression greaterThan(Object theValue)

PUBLIC: Return an expression that compares if the receiver's value is greater than the other value. This is equivalent to the SQL ">" operator.

greaterThan

public Expression greaterThan(Expression theValue)

greaterThan

public Expression greaterThan(short theValue)

PUBLIC: Return an expression that compares if the receivers value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

greaterThan

public Expression greaterThan(boolean theBoolean)

PUBLIC: Return an expression that compares if the receivers value is equal to the other value. This is equivalent to the SQL "=" operator and Java "equals" method.

greaterThanEqual

public Expression greaterThanEqual(byte theValue)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

greaterThanEqual

public Expression greaterThanEqual(char theChar)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

greaterThanEqual

public Expression greaterThanEqual(double theValue)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

greaterThanEqual

public Expression greaterThanEqual(float theValue)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

greaterThanEqual

public Expression greaterThanEqual(int theValue)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

greaterThanEqual

public Expression greaterThanEqual(long theValue)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

greaterThanEqual

public Expression greaterThanEqual(Object theValue)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

greaterThanEqual

public Expression greaterThanEqual(Expression theValue)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

greaterThanEqual

public Expression greaterThanEqual(short theValue)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

greaterThanEqual

public Expression greaterThanEqual(boolean theBoolean)

PUBLIC: Return an expression that compares if the receivers value is greater and equal to the other value. This is equivalent to the SQL ">=" operator.

hasAsOfClause

public boolean hasAsOfClause()

ADVANCED: Answers true if this is to be queried as of a past time.

Returns:

false from asOf(null); hasAsOfClause().

See Also:

• getAsOfClause()

hasBeenAliased

public boolean hasBeenAliased()

INTERNAL: Answers if the database tables associated with this expression have been aliased. This insures the same tables are not aliased twice.

hexToRaw

public Expression hexToRaw()

PUBLIC: Function, returns binary array value for the hex string.

ifNull

public Expression ifNull(Object nullValue)

PUBLIC: Function return a specific value if item returned from the query is null. Equivalent of the oracle NVL function

Example:

 EclipseLink: employee.get("name").ifNull("no-name")
 Java: NA
 SQL: NVL(name, 'no-name')
 

in

public Expression in(byte[] theBytes)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

in

public Expression in(char[] theChars)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

in

public Expression in(double[] theDoubles)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

in

public Expression in(float[] theFloats)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

in

public Expression in(int[] theInts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

in

public Expression in(long[] theLongs)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

in

public Expression in(Object[] theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

in

public Expression in(short[] theShorts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

in

public Expression in(boolean[] theBooleans)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

in

public Expression in(Collection theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

Example:

     EclipseLink: employee.get("age").in(ages)
     Java: ages.contains(employee.getAge())
     SQL: AGE IN (55, 18, 30)
 

in

public Expression in(Expression arguments)

in

public Expression in(ReportQuery subQuery)

index

public Expression index()

indexOf

public Expression indexOf(Object substring)

PUBLIC: Function, returns the integer index of the substring within the source string.

isClassTypeExpression

public boolean isClassTypeExpression()

INTERNAL:

isCompoundExpression

public boolean isCompoundExpression()

INTERNAL:

isConstantExpression

public boolean isConstantExpression()

INTERNAL:

isDataExpression

public boolean isDataExpression()

INTERNAL:

isEmpty

public Expression isEmpty(String attributeName)

PUBLIC: A logical expression for the collection attributeName being empty. Equivalent to size(attributeName).equal(0)

Example:

     EclipseLink: employee.isEmpty("phoneNumbers")
     Java: employee.getPhoneNumbers().size() == 0
     SQL: SELECT ... FROM EMP t0 WHERE (
      (SELECT COUNT(*) FROM PHONE t1 WHERE (t0.EMP_ID = t1.EMP_ID)) = 0)
 

This is a case where a fast operation in java does not translate to an equally fast operation in SQL, requiring a correlated subselect.

See Also:

• size(java.lang.String)

isExpressionBuilder

public boolean isExpressionBuilder()

INTERNAL:

isFieldExpression

public boolean isFieldExpression()

INTERNAL:

isFunctionExpression

public boolean isFunctionExpression()

INTERNAL:

isLiteralExpression

public boolean isLiteralExpression()

INTERNAL:

isLogicalExpression

public boolean isLogicalExpression()

INTERNAL:

isNull

public Expression isNull()

PUBLIC: Compare to null.

isObjectExpression

public boolean isObjectExpression()

INTERNAL:

isParameterExpression

public boolean isParameterExpression()

INTERNAL:

isQueryKeyExpression

public boolean isQueryKeyExpression()

INTERNAL:

isRelationExpression

public boolean isRelationExpression()

INTERNAL:

isSubSelectExpression

public boolean isSubSelectExpression()

INTERNAL:

isTableExpression

public boolean isTableExpression()

INTERNAL:

isTreatExpression

public boolean isTreatExpression()

INTERNAL:

isMapEntryExpression

public boolean isMapEntryExpression()

INTERNAL:

isValueExpression

public boolean isValueExpression()

INTERNAL: Subclasses implement (isParameterExpression() || isConstantExpression())

iterateOn

public void iterateOn(org.eclipse.persistence.internal.expressions.ExpressionIterator iterator)

INTERNAL: For iterating using an inner class

lastDay

public Expression lastDay()

PUBLIC: Function, returns the date with the last date in the months of this source date.

leftPad

public Expression leftPad(int size,
 Object substring)

PUBLIC: Function, returns the string padded with the substring to the size.

leftPad

public Expression leftPad(Object size,
 Object substring)

PUBLIC: Function, returns the string padded with the substring to the size.

leftTrim

public Expression leftTrim()

PUBLIC: Function, returns the string left trimmed for white space.

leftTrim

public Expression leftTrim(Object substring)

PUBLIC: Function, returns the string with the substring trimed from the left.

length

public Expression length()

PUBLIC: Function, returns the size of the string.

lessThan

public Expression lessThan(byte theValue)

PUBLIC: Return an expression that compares if the receivers value is less than the other value. This is equivalent to the SQL "<" operator.

lessThan

public Expression lessThan(char theChar)

PUBLIC: Return an expression that compares if the receivers value is less than the other value. This is equivalent to the SQL "<" operator.

lessThan

public Expression lessThan(double theValue)

PUBLIC: Return an expression that compares if the receivers value is less than the other value. This is equivalent to the SQL "<" operator.

lessThan

public Expression lessThan(float theValue)

PUBLIC: Return an expression that compares if the receivers value is less than the other value. This is equivalent to the SQL "<" operator.

lessThan

public Expression lessThan(int theValue)

PUBLIC: Return an expression that compares if the receivers value is less than the other value. This is equivalent to the SQL "<" operator.

lessThan

public Expression lessThan(long theValue)

PUBLIC: Return an expression that compares if the receivers value is less than the other value. This is equivalent to the SQL "<" operator.

lessThan

public Expression lessThan(Object theValue)

PUBLIC: Return an expression that compares if the receivers value is less than the other value. This is equivalent to the SQL "<" operator.

lessThan

public Expression lessThan(Expression theValue)

lessThan

public Expression lessThan(short theValue)

PUBLIC: Return an expression that compares if the receivers value is less than the other value. This is equivalent to the SQL "<" operator.

lessThan

public Expression lessThan(boolean theBoolean)

PUBLIC: Return an expression that compares if the receivers value is less than the other value. This is equivalent to the SQL "<" operator.

lessThanEqual

public Expression lessThanEqual(byte theValue)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

lessThanEqual

public Expression lessThanEqual(char theChar)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

lessThanEqual

public Expression lessThanEqual(double theValue)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

lessThanEqual

public Expression lessThanEqual(float theValue)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

lessThanEqual

public Expression lessThanEqual(int theValue)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

lessThanEqual

public Expression lessThanEqual(long theValue)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

lessThanEqual

public Expression lessThanEqual(Object theValue)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

lessThanEqual

public Expression lessThanEqual(Expression theValue)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

lessThanEqual

public Expression lessThanEqual(short theValue)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

lessThanEqual

public Expression lessThanEqual(boolean theBoolean)

PUBLIC: Return an expression that compares if the receivers value is less than and equal to the other value. This is equivalent to the SQL "<=" operator.

like

public Expression like(String value)

PUBLIC: Return an expression that compares if the receivers value is like other value. This is equivalent to the SQL "LIKE" operator that except wildcards. The character "%" means any sequence of characters and the character "_" mean any character. i.e. "B%" == "Bob", "B_B" == "BOB"

Example:

     EclipseLink: employee.get("firstName").like("B%")
     Java: NA
     SQL: F_NAME LIKE 'B%'
 

like

public Expression like(String value,
 String escapeSequence)

PUBLIC: Return an expression that compares if the receivers value is like other value. This is equivalent to the SQL "LIKE ESCAPE" operator that except wildcards. The character "%" means any sequence of characters and the character "_" mean any character. i.e. "B%" == "Bob", "B_B" == "BOB" The escape sequence specifies a set of characters the may be used to indicate that an one of the wildcard characters should be interpreted literally.

Example:

     EclipseLink: employee.get("firstName").like("B\_SMITH", "\")
     Java: NA
     SQL: F_NAME LIKE 'B\_SMITH ESCAPE '\''
 

like

public Expression like(Expression argument)

PUBLIC: Return an expression that compares if the receivers value is like other value. This is equivalent to the SQL "LIKE" operator that except wildcards. The character "%" means any sequence of characters and the character "_" mean any character. i.e. "B%" == "Bob", "B_B" == "BOB"

Example:

     EclipseLink: employee.get("firstName").like("B%")
     Java: NA
     SQL: F_NAME LIKE 'B%'
 

regexp

public Expression regexp(String regexp)

PUBLIC: Return an expression that compares if the receivers value matches the regular expression. This uses the databases support for regular expression. Regular expressions are similar to LIKE except support a much larger scope of comparisons. i.e. "^B.*" == "Bob", "^B.B$" == "BOB"

Example:

     EclipseLink: employee.get("firstName").regexp("^B.*")
     Java: Pattern.compile("^B.*").matcher(employee.getFirstName()).matches()
     SQL: F_NAME REGEXP '^B.*'
 

regexp

public Expression regexp(Expression regexp)

PUBLIC: Return an expression that compares if the receivers value matches the regular expression. This uses the databases support for regular expression. Regular expressions are similar to LIKE except support a much larger scope of comparisons. i.e. "^B.*" == "Bob", "^B.B$" == "BOB"

Example:

     EclipseLink: employee.get("firstName").regexp("^B.*")
     Java: Pattern.compile("^B.*").matcher(employee.getFirstName()).matches()
     SQL: F_NAME REGEXP '^B.*'
 

like

public Expression like(Expression value,
 Expression escapeSequence)

PUBLIC: Return an expression that compares if the receivers value is like other value. This is equivalent to the SQL "LIKE ESCAPE" operator that except wildcards. The character "%" means any sequence of characters and the character "_" mean any character. i.e. "B%" == "Bob", "B_B" == "BOB" The escape sequence specifies a set of characters the may be used to indicate that an one of the wildcard characters should be interpreted literally.

Example:

     EclipseLink: employee.get("firstName").like("B\_SMITH", "\")
     Java: NA
     SQL: F_NAME LIKE 'B\_SMITH ESCAPE '\''
 

likeIgnoreCase

public Expression likeIgnoreCase(String theValue)

PUBLIC: Return an expression that compares if the receivers value is like the other value, ignoring case. This is a case in-sensitive like.

Example:

     EclipseLink: employee.get("firstName").likeIgnoreCase("%Bob%")
     Java: none
     SQL: UPPER(F_NAME) LIKE 'BOB'
 

likeIgnoreCase

public Expression likeIgnoreCase(Expression theValue)

PUBLIC: Return an expression that compares if the receivers value is like the other value, ignoring case. This is a case in-sensitive like.

locate

public Expression locate(Object str)

PUBLIC: Function, returns the position of str in this

Example:

 EclipseLink: employee.get("firstName").locate("ob")
 Java: employee.getFirstName().indexOf("ob") + 1
 SQL: LOCATE('ob', t0.F_NAME)
 

Note that while in String.locate(str) -1 is returned if not found, and the index starting at 0 if found, in SQL it is 0 if not found, and the index starting at 1 if found.

locate

public Expression locate(String str,
 int fromIndex)

PUBLIC: Function, returns the position of str in this, starting the search at fromIndex.

Example:

 EclipseLink: employee.get("firstName").locate("ob", 1)
 Java: employee.getFirstName().indexOf("ob", 1) + 1
 SQL: LOCATE('ob', t0.F_NAME, 1)
 

Note that while in String.locate(str) -1 is returned if not found, and the index starting at 0 if found, in SQL it is 0 if not found, and the index starting at 1 if found.

locate

public Expression locate(Object str,
 Object fromIndex)

PUBLIC: Function, returns the position of str in this, starting the search at fromIndex.

Example:

 EclipseLink: employee.get("firstName").locate("ob", 1)
 Java: employee.getFirstName().indexOf("ob", 1) + 1
 SQL: LOCATE('ob', t0.F_NAME, 1)
 

Note that while in String.locate(str) -1 is returned if not found, and the index starting at 0 if found, in SQL it is 0 if not found, and the index starting at 1 if found.

maximum

public Expression maximum()

PUBLIC: This represents the aggregate function Maximum. Can be used only within Report Queries.

minimum

public Expression minimum()

PUBLIC: This represents the aggregate function Minimum. Can be used only within Report Queries.

monthsBetween

public Expression monthsBetween(Object otherDate)

PUBLIC: Function, returns the decimal number of months between the two dates.

mapEntry

public Expression mapEntry()

PUBLIC: Return a Map.Entry containing the key and the value from a mapping that maps to a java.util.Map This expression can only be used as a return value in a ReportQuery and cannot be used as part of the WHERE clause in any query EclipseLink: eb.get("mapAttribute").mapEntry()

Returns:

mapKey

public Expression mapKey()

PUBLIC: Return the key from a mapping that maps to a java.util.Map This expression can be used either in as a return value in a ReportQuery or in the WHERE clause in a query EclipseLink: eb.get("mapAttribute").mapKey()

Returns:

newTime

public Expression newTime(String timeZoneFrom,
 String timeZoneTo)

PUBLIC: funcation return a date converted to a new timezone. Equivalent of the Oracle NEW_TIME function

Example:

 EclipseLink: employee.get("date").newTime("EST", "PST")
 Java: NA
 SQL: NEW_TIME(date, 'EST', 'PST')
 

nextDay

public Expression nextDay(Object dayName)

PUBLIC: Function, returns the date with the next day from the source date as the day name given.

noneOf

public Expression noneOf(String attributeName,
 Expression criteria)

PUBLIC: Returns an expression equivalent to none of attributeName holding true for criteria.

For every expression with an anyOf, its negation has either an allOf or a noneOf. The following two examples will illustrate as the second is the negation of the first:

AnyOf Example: Employees with a '613' area code phone number.

 ReadAllQuery query = new ReadAllQuery(Employee.class);
 ExpressionBuilder employee = new ExpressionBuilder();
 Expression exp = employee.anyOf("phoneNumbers").get("areaCode").equal("613");
 

NoneOf Example: Employees with no '613' area code phone numbers.

 ExpressionBuilder employee = new ExpressionBuilder();
 ExpressionBuilder phones = new ExpressionBuilder();
 Expression exp = employee.noneOf("phoneNumbers", phones.get("areaCode").equal("613"));
 SQL:
 SELECT ... EMPLOYEE t0 WHERE NOT EXISTS (SELECT ... PHONE t1 WHERE
                         (t0.EMP_ID = t1.EMP_ID) AND (t1.AREACODE = '613'))
 

noneOf is the universal counterpart to the existential anyOf. To have the condition evaluated for each instance it must be put inside of a subquery, which can be expressed as not exists (any of attributeName some condition). (All x such that !y = !Exist x such that y).

Likewise the syntax employee.noneOf("phoneNumbers").get("areaCode").equal("613") is not supported for the equal must go inside a subQuery.

This method saves you from writing the sub query yourself. The above is equivalent to the following expression:

 ExpressionBuilder employee = new ExpressionBuilder();
 ExpressionBuilder phone = new ExpressionBuilder();
 ReportQuery subQuery = new ReportQuery(Phone.class, phone);
 subQuery.retreivePrimaryKeys();
 subQuery.setSelectionCriteria(phone.equal(employee.anyOf("phoneNumbers").and(
         phone.get("areaCode").equal("613")));
 Expression exp = employee.notExists(subQuery);
 

Parameters:

criteria - must have its own builder, as it will become the separate selection criteria of a subQuery.

Returns:

a notExists subQuery expression

normalize

public Expression normalize(org.eclipse.persistence.internal.expressions.ExpressionNormalizer normalizer)

INTERNAL: Normalize into a structure that is printable. Also compute printing information such as outer joins.

not

public Expression not()

PUBLIC: Return an expression that is the boolean logical negation of the expression. This is equivalent to the SQL "NOT" operator and the Java "!" operator.

Example:

     EclipseLink: employee.get("age").equal(24).not()
     Java: (! (employee.getAge() == 24))
     SQL: NOT (AGE = 24)
 

notBetween

public Expression notBetween(byte leftValue,
 byte rightValue)

PUBLIC: Return an expression that compares if the receivers value is not between two other values. Equivalent to between negated.

See Also:

• between(Object, Object)

notBetween

public Expression notBetween(char leftChar,
 char rightChar)

PUBLIC: Return an expression that compares if the receivers value is not between two other values. Equivalent to between negated.

See Also:

• between(Object, Object)

notBetween

public Expression notBetween(double leftValue,
 double rightValue)

PUBLIC: Return an expression that compares if the receivers value is not between two other values. Equivalent to between negated.

See Also:

• between(Object, Object)

notBetween

public Expression notBetween(float leftValue,
 float rightValue)

PUBLIC: Return an expression that compares if the receivers value is not between two other values. Equivalent to between negated.

See Also:

• between(Object, Object)

notBetween

public Expression notBetween(int leftValue,
 int rightValue)

PUBLIC: Return an expression that compares if the receivers value is not between two other values. Equivalent to between negated.

See Also:

• between(Object, Object)

notBetween

public Expression notBetween(long leftValue,
 long rightValue)

PUBLIC: Return an expression that compares if the receivers value is not between two other values. Equivalent to between negated.

See Also:

• between(Object, Object)

notBetween

public Expression notBetween(Object leftValue,
 Object rightValue)

PUBLIC: Return an expression that compares if the receivers value is not between two other values. Equivalent to between negated.

See Also:

• between(Object, Object)

notBetween

public Expression notBetween(Expression leftExpression,
 Expression rightExpression)

PUBLIC: Return an expression that compares if the receivers value is not between two other values. Equivalent to between negated.

See Also:

• between(Object, Object)

notBetween

public Expression notBetween(short leftValue,
 short rightValue)

PUBLIC: Return an expression that compares if the receivers value is not between two other values. Equivalent to between negated.

See Also:

• between(Object, Object)

notEmpty

public Expression notEmpty(String attributeName)

PUBLIC: A logical expression for the collection attributeName not being empty. Equivalent to size(attributeName).greaterThan(0)

Example:

     EclipseLink: employee.notEmpty("phoneNumbers")
     Java: employee.getPhoneNumbers().size() > 0
     SQL: SELECT ... FROM EMP t0 WHERE (
      (SELECT COUNT(*) FROM PHONE t1 WHERE (t0.EMP_ID = t1.EMP_ID)) > 0)
 

This is a case where a fast operation in java does not translate to an equally fast operation in SQL, requiring a correlated subselect.

See Also:

• size(java.lang.String)

notEqual

public Expression notEqual(byte theValue)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notEqual

public Expression notEqual(char theChar)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notEqual

public Expression notEqual(double theValue)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notEqual

public Expression notEqual(float theValue)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notEqual

public Expression notEqual(int theValue)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notEqual

public Expression notEqual(long theValue)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notEqual

public Expression notEqual(Object theValue)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notEqual

public Expression notEqual(Expression theValue)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notEqual

public Expression notEqual(short theValue)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notEqual

public Expression notEqual(boolean theBoolean)

PUBLIC: Return an expression that compares if the receivers value is not equal to the other value. This is equivalent to the SQL "<>" operator

See Also:

• equal(Object)

notExists

public Expression notExists(ReportQuery subQuery)

PUBLIC: Return a sub query expression. A sub query using a report query to define a subselect within another queries expression or select's where clause. The sub query (the report query) will use its own expression builder be can reference expressions from the base expression builder.

Example:

 ExpressionBuilder builder = new ExpressionBuilder();
 ReportQuery subQuery = new ReportQuery(Employee.class, new ExpressionBuilder());
 subQuery.setSelectionCriteria(subQuery.getExpressionBuilder().get("name").equal(builder.get("name")));
 builder.notExists(subQuery);
 

notIn

public Expression notIn(byte[] theBytes)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

notIn

public Expression notIn(char[] theChars)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

notIn

public Expression notIn(double[] theDoubles)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

notIn

public Expression notIn(float[] theFloats)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

notIn

public Expression notIn(int[] theInts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

notIn

public Expression notIn(long[] theLongs)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

notIn

public Expression notIn(Object[] theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

notIn

public Expression notIn(ReportQuery subQuery)

notIn

public Expression notIn(short[] theShorts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

notIn

public Expression notIn(boolean[] theBooleans)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

notIn

public Expression notIn(Collection theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. The collection can be a collection of constants or expressions. This is equivalent to the SQL "IN" operator and Java "contains" operator.

Example:

     EclipseLink: employee.get("age").in(ages)
     Java: ages.contains(employee.getAge())
     SQL: AGE IN (55, 18, 30)
 

notIn

public Expression notIn(Expression arguments)

notLike

public Expression notLike(String aString)

PUBLIC: Return an expression that compares if the receivers value is not like the other value. Equivalent to like negated.

See Also:

• like(String)

notLike

public Expression notLike(Expression arguments)

PUBLIC: Return an expression that compares if the receivers value is not like the other value. Equivalent to like negated.

See Also:

• like(String)

notLike

public Expression notLike(String value,
 String escapeSequence)

PUBLIC: Return an expression that compares if the receivers value is not like the other value. Equivalent to like negated.

Parameters:

value - string to compare

escapeSequence - the escape character to use

See Also:

• like(String)

notLike

public Expression notLike(Expression value,
 Expression escapeSequence)

PUBLIC: Return an expression that compares if the receivers value is not like the other value. Equivalent to like negated.

Parameters:

value - string to compare

escapeSequence - the escape character to use

See Also:

• like(String)

notNull

public Expression notNull()

PUBLIC: Return an expression representing a comparison to null

Example:

     EclipseLink: employee.get("age").notNull()
     Java: employee.getAge() != null
     SQL: AGE IS NOT NULL
 

or

public Expression or(Expression theExpression)

PUBLIC: Return an expression that is the boolean logical combination of both expressions. This is equivalent to the SQL "OR" operator and the Java "||" operator.

Example:

     EclipseLink: employee.get("firstName").equal("Bob").OR(employee.get("lastName").equal("Smith"))
     Java: (employee.getFirstName().equals("Bob")) || (employee.getLastName().equals("Smith"))
     SQL: F_NAME = 'Bob' OR L_NAME = 'Smith'
 

performOperator

public Expression performOperator(ExpressionOperator anOperator,
 List args)

INTERNAL:

postCopyIn

protected void postCopyIn(Map alreadyDone)

postfixSQL

public Expression postfixSQL(String sqlString)

ADVANCED: Inserts the SQL as is directly into the expression. The sql will be printed immediately after (postfixed to) the sql for this. Warning: Allowing an unverified SQL string to be passed into this method makes your application vulnerable to SQL injection attacks.

prefixSQL

public Expression prefixSQL(String sqlString)

ADVANCED: Insert the SQL as is directly into the expression. The sql will be printed immediately before (prefixed to) the sql for this. Warning: Allowing an unverified SQL string to be passed into this method makes your application vulnerable to SQL injection attacks.

printSQL

public abstract void printSQL(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer)

INTERNAL: Print SQL

printJava

public void printJava(org.eclipse.persistence.internal.expressions.ExpressionJavaPrinter printer)

INTERNAL: Print java for project class generation

rebuildOn

public abstract Expression rebuildOn(Expression newBase)

INTERNAL: This expression is built on a different base than the one we want. Rebuild it and return the root of the new tree If receiver is a complex expression, use cloneUsing(newBase) instead.

See Also:

• cloneUsing(Expression newBase)

resetPlaceHolderBuilder

public abstract void resetPlaceHolderBuilder(ExpressionBuilder queryBuilder)

INTERNAL: Search the tree for any expressions (like SubSelectExpressions) that have been built using a builder that is not attached to the query. This happens in case of an Exists call using a new ExpressionBuilder(). This builder needs to be replaced with one from the query.

ref

public Expression ref()

ADVANCED: For Object-relational support.

registerIn

protected Expression registerIn(Map alreadyDone)

replace

public Expression replace(Object stringToReplace,
 Object stringToReplaceWith)

PUBLIC: Function, returns the string with occurances of the first substring replaced with the second substring.

replicate

public Expression replicate(int constant)

PUBLIC: return the result of this query repeated a given number of times. Equivalent of the Sybase REPLICATE function

Example:

 EclipseLink: employee.get("name").replicate(2)
 Java: NA
 SQL: REPLICATE(name, 2)
 

replicate

public Expression replicate(Object theValue)

PUBLIC: return the result of this query repeated a given number of times. Equivalent of the Sybase REPLICATE function

Example:

 EclipseLink: employee.get("name").replicate(2)
 Java: NA
 SQL: REPLICATE(name, 2)
 

resetCache

protected void resetCache()

Reset cached information here so that we can be sure we're accurate.

reverse

public Expression reverse()

PUBLIC: Function return the reverse of the query result. Equivalent of the Sybase REVERSE function

Example:

 EclipseLink: employee.get("name").reverse()
 Java: NA
 SQL: REVERSE(name)
 

right

public Expression right(int characters)

PUBLIC: Function return a given number of characters starting at the right of a string. Equivalent to the Sybase RIGHT function

Example:

 EclipseLink: employee.get("name").right(2)
 Java: NA
 SQL: RIGHT(name, 2)
 

right

public Expression right(Object characters)

PUBLIC: Function return a given number of characters starting at the right of a string. Equivalent to the Sybase RIGHT function

Example:

 EclipseLink: employee.get("name").right(2)
 Java: NA
 SQL: RIGHT(name, 2)
 

rightPad

public Expression rightPad(int size,
 Object substring)

PUBLIC: Function, returns the string padded with the substring to the size.

rightPad

public Expression rightPad(Object size,
 Object substring)

PUBLIC: Function, returns the string padded with the substring to the size.

rightTrim

public Expression rightTrim()

PUBLIC: Function, returns the string right trimmed for white space.

rightTrim

public Expression rightTrim(Object substring)

PUBLIC: Function, returns the string with the substring trimed from the right.

roundDate

public Expression roundDate(Object yearOrMonthOrDayRoundToken)

PUBLIC: Function, returns the date rounded to the year, month or day.

selectIfOrderedBy

public boolean selectIfOrderedBy()

PUBLIC: Return whether this expression should be included in the SELECT clause if it is used in an ORDER BY clause

setLocalBase

public void setLocalBase(Expression exp)

INTERNAL: Set the local base expression, ie the one on the other side of the operator Most types will ignore this, since they don't need it.

setSelectIfOrderedBy

public void setSelectIfOrderedBy(boolean selectIfOrderedBy)

PUBLIC: Set whether this expression should be included in the SELECT clause of a query that uses it in the ORDER BY clause.

Parameters:

selectIfOrderedBy -

shallowClone

public Expression shallowClone()

INTERNAL:

size

public Expression size(String attributeName)

PUBLIC: A logical expression for the size of collection attributeName.

Example:

     EclipseLink: employee.size("phoneNumbers")
     Java: employee.getPhoneNumbers().size()
     SQL: SELECT ... FROM EMP t0 WHERE  ...
      (SELECT COUNT(*) FROM PHONE t1 WHERE (t0.EMP_ID = t1.EMP_ID))
 

This is a case where a fast operation in java does not translate to an equally fast operation in SQL, requiring a correlated subselect.

size

public Expression size(Class returnType)

PUBLIC: A logical expression for the size of collection expression.

Example:

     EclipseLink: employee.size(Class returnType)
     Java: employee.getPhoneNumbers().size()
     SQL: SELECT ... FROM EMP t0 WHERE  ...
      (SELECT COUNT(*) FROM PHONE t1 WHERE (t0.EMP_ID = t1.EMP_ID))
 

This is a case where a fast operation in java does not translate to an equally fast operation in SQL, requiring a correlated subselect.

standardDeviation

public Expression standardDeviation()

PUBLIC: This represents the aggregate function StandardDeviation. Can be used only within Report Queries.

subQuery

public Expression subQuery(ReportQuery subQuery)

PUBLIC: Return a sub query expression. A sub query using a report query to define a subselect within another queries expression or select's where clause. The sub query (the report query) will use its own expression builder be can reference expressions from the base expression builder.

Example:

 ExpressionBuilder builder = new ExpressionBuilder();
 ReportQuery subQuery = new ReportQuery(Employee.class, new ExpressionBuilder());
 subQuery.addMaximum("salary");
 builder.get("salary").equal(builder.subQuery(subQuery));
 

substring

public Expression substring(int startPosition,
 int size)

PUBLIC: Function, returns the substring from the source string. EclipseLink: employee.get("firstName").substring(1, 2) Java: NA SQL: SUBSTR(FIRST_NAME, 1, 2)

substring

public Expression substring(Object startPosition,
 Object size)

PUBLIC: Function, returns the substring from the source string. EclipseLink: employee.get("firstName").substring(1, 2) Java: NA SQL: SUBSTR(FIRST_NAME, 1, 2)

substring

public Expression substring(int startPosition)

PUBLIC: Function, returns the substring from the source string. EclipseLink: employee.get("firstName").substring(1) Java: NA SQL: SUBSTR(FIRST_NAME, 1)

substring

public Expression substring(Object startPosition)

PUBLIC: Function, returns the substring from the source string. EclipseLink: employee.get("firstName").substring(1) Java: NA SQL: SUBSTR(FIRST_NAME, 1)

sum

public Expression sum()

PUBLIC: This represents the aggregate function Sum. Can be used only within Report Queries.

toCharacter

public Expression toCharacter()

PUBLIC: Function, returns the single character string with the ascii or character set value.

toDate

public Expression toDate()

PUBLIC: Function, returns date from the string using the default format.

toChar

public Expression toChar()

PUBLIC: Return an expression that represents the receiver value converted to a character string. This is equivalent to the SQL "TO_CHAR" operator and Java "toString" method.

Example:

     EclipseLink: employee.get("salary").toChar().equal("100000")
     Java: employee.getSalary().toString().equals("100000")
     SQL: TO_CHAR(SALARY) = '100000'
 

toChar

public Expression toChar(String format)

PUBLIC: Return an expression that represents the receiver value converted to a character string, with the database formating options (i.e. 'year', 'yyyy', 'day', etc.). This is equivalent to the SQL "TO_CHAR" operator and Java Date API.

Example:

     EclipseLink: employee.get("startDate").toChar("day").equal("monday")
     Java: employee.getStartDate().getDay().equals("monday")
     SQL: TO_CHAR(START_DATE, 'day') = 'monday'
 

toLowerCase

public Expression toLowerCase()

PUBLIC: Return an expression that represents the receiver value converted to lower case. This is equivalent to the SQL "LOWER" operator and Java "toLowerCase" method. This is only allowed for String attribute values.

Example:

     EclipseLink: employee.get("firstName").toLowerCase().equal("bob")
     Java: employee.getFirstName().toLowerCase().equals("bob")
     SQL: LOWER(F_NAME) = 'bob'
 

toNumber

public Expression toNumber()

PUBLIC: Function, returns the number converted from the string.

toString

public String toString()

PUBLIC: Print a debug form of the expression tree.

Overrides:

toString in class Object

toString

public void toString(BufferedWriter writer,
 int indent)
              throws IOException

INTERNAL: Print a debug form of the expression tree.

Throws:

IOException

toUpperCase

public Expression toUpperCase()

PUBLIC: Return an expression that represents the receiver value converted to upper case. This is equivalent to the SQL "UPPER" operator and Java "toUpperCase" method. This is only allowed for String attribute values.

Example:

     EclipseLink: employee.get("firstName").toUpperCase().equal("BOB")
     Java: employee.getFirstName().toUpperCase().equals("BOB")
     SQL: UPPER(F_NAME) = 'BOB'
 

toUppercaseCasedWords

public Expression toUppercaseCasedWords()

PUBLIC: Function, returns the string with the first letter of each word capitalized.

translate

public Expression translate(Object fromString,
 Object toString)

PUBLIC: Function, returns the string with each char from the from string converted to the char in the to string.

trim

public Expression trim()

PUBLIC: Function, returns the string trimmed for white space.

trim

public Expression trim(Object substring)

PUBLIC: Function, returns the string right and left trimmed for the substring.

extractXml

public Expression extractXml(String xpath)

PUBLIC: XMLType Function, extracts a secton of XML from a larget XML document

Parameters:

xpath - XPath expression representing the node to be returned

extract

public Expression extract(String part)

PUBLIC: Extract the date part from the date/time value. EXTRACT is part of the SQL standard, so should be supported by most databases.

Parameters:

part - is the date part to extract, "YEAR", "MONTH", "DAY", "HOUR", "MINUTE", "SECOND", "TIMEZONE_HOUR", "TIMEZONE_MINUTE".

cast

public Expression cast(String type)

PUBLIC: Cast the value to the database type. CAST is part of the SQL standard, so should be supported by most databases.

Parameters:

type - is the database type name, this is database specific but should include, "CHAR", "VARCHAR", "NUMERIC", "INTEGER", "DATE", "TIME", "TIMESTAMP", the type may include a size and scale.

extractValue

public Expression extractValue(String xpath)

PUBLIC: XMLType Function, extracts a value from an XMLType field

Parameters:

xpath - XPath expression

existsNode

public Expression existsNode(String xpath)

PUBLIC: XMLType Function, gets the number of nodes returned by the given xpath expression returns 0 if there are none

Parameters:

xpath - Xpath expression

isFragment

public Expression isFragment()

PUBLIC: XMLType Function - evaluates to 0 if the xml is a well formed document and 1 if the document is a fragment

getStringVal

public Expression getStringVal()

PUBLIC: XMLType Function - gets a string value from an XMLType

getNumberVal

public Expression getNumberVal()

PUBLIC: XMLType Function - gets a number value from an XMLType

truncateDate

public Expression truncateDate(String datePart)

PUBLIC: return the date truncated to the indicated datePart. Equivalent to the Sybase TRUNC function for dates

Example:

 EclipseLink: employee.get("date").truncDate(year)
 Java: NA
 SQL: TRUNC(date, year)
 

twist

public Expression twist(Expression expression,
 Expression newBase)

INTERNAL: We are given an expression that comes from a different context than the one in which this was built, e.g. it is the selection criteria of a mapping, or the criteria on which multiple tables are joined in a descriptor. We need to transform it so it refers to the objects we are dealing with, and AND it into the rest of our expression. We want to replace the original base expression with (newBase), and any parameters will be given values based on the context which (this) provides. For example, suppose that the main expression is emp.address.streetName = 'something' and we are trying to twist the selection criteria for the mapping 'address' in Employee. Because that mapping selects addresses, we will use the 'address' node as the base. Values for any parameters will come from the 'emp' node, which was the base of the original expression. Note that the values need not be constants, they can be fields. We do this by taking the tree we're trying to merge and traverse it more or less re-executing it it with the appropriate initial receiver and context. Return the root of the new expression tree. This will probably need to be AND'ed with the root of the old tree.

twistedForBaseAndContext

public Expression twistedForBaseAndContext(Expression newBase,
 Expression context,
 Expression oldBase)

INTERNAL: Rebuild myself against the base, with the values of parameters supplied by the context expression. This is used for transforming a standalone expression (e.g. the join criteria of a mapping) into part of some larger expression. You normally would not call this directly, instead calling twist See the comment there for more details"

validateNode

public void validateNode()

INTERNAL: Do any required validation for this node. Throw an exception for any incorrect constructs.

value

public Expression value()

PUBLIC: Function, this represents the value function, used in nestedtable

value

public Expression value(byte constant)

PUBLIC: Return an expression on the constant.

Example:

 reportQuery.addItem("a constant", builder.value("a constant"));
 

value

public Expression value(char constant)

PUBLIC: Return an expression on the constant.

Example:

 reportQuery.addItem("a constant", builder.value("a constant"));
 

value

public Expression value(double constant)

PUBLIC: Return an expression on the constant.

Example:

 reportQuery.addItem("a constant", builder.value("a constant"));
 

value

public Expression value(float constant)

PUBLIC: Return an expression on the constant.

Example:

 reportQuery.addItem("a constant", builder.value("a constant"));
 

value

public Expression value(int constant)

PUBLIC: Return an expression on the constant.

Example:

 reportQuery.addItem("a constant", builder.value("a constant"));
 

value

public Expression value(long constant)

PUBLIC: Return an expression on the constant.

Example:

 reportQuery.addItem("a constant", builder.value("a constant"));
 

value

public Expression value(Object constant)

PUBLIC: Return an expression on the constant.

Example:

 reportQuery.addItem("a constant", builder.value("a constant"));
 

value

public Expression value(short constant)

PUBLIC: Return an expression on the constant.

Example:

 reportQuery.addItem("a constant", builder.value("a constant"));
 

value

public Expression value(boolean constant)

PUBLIC: Return an expression on the constant.

Example:

 reportQuery.addItem("a constant", builder.value("a constant"));
 

literal

public Expression literal(String literal)

ADVANCED: Return an expression on the literal. A literal is a specific SQL syntax string that will be printed as is without quotes in the SQL. It can be useful for printing database key words or global variables.

Example:

 reportQuery.addItem("currentTime", builder.literal("SYSDATE"));
 

alias

public Expression alias(String alias)

ADVANCED: Return an expression for the alias. This allows an alias used in the select clause to be used in other clauses.

valueFromObject

public Object valueFromObject(Object object,
 org.eclipse.persistence.internal.sessions.AbstractSession session,
 org.eclipse.persistence.internal.sessions.AbstractRecord translationRow,
 int valueHolderPolicy,
 boolean isObjectUnregistered)

INTERNAL: Return the value for in memory comparison. This is only valid for valueable expressions. New parameter added for feature 2612601

Parameters:

isObjectUnregistered - true if object possibly not a clone, but is being conformed against the unit of work cache.

valueFromObject

public Object valueFromObject(Object object,
 org.eclipse.persistence.internal.sessions.AbstractSession session,
 org.eclipse.persistence.internal.sessions.AbstractRecord translationRow,
 int valueHolderPolicy)

INTERNAL: Return the value for in memory comparison. This is only valid for valueable expressions.

variance

public Expression variance()

PUBLIC: Function, this represents the aggregate function Variance. Can be used only within Report Queries.

writeDescriptionOn

public void writeDescriptionOn(BufferedWriter writer)
                        throws IOException

INTERNAL: Used to print a debug form of the expression tree.

Throws:

IOException

writeField

protected void writeField(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer,
 org.eclipse.persistence.internal.helper.DatabaseField field,
 org.eclipse.persistence.internal.expressions.SQLSelectStatement statement)

INTERNAL: Append the field name to the writer. Should be overridden for special operators such as functions.

writeAlias

protected void writeAlias(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer,
 org.eclipse.persistence.internal.helper.DatabaseField field,
 org.eclipse.persistence.internal.expressions.SQLSelectStatement statement)

INTERNAL: Append the field's alias to the writer. This is used for pessimistic locking.

writeFields

public void writeFields(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer,
 List<org.eclipse.persistence.internal.helper.DatabaseField> newFields,
 org.eclipse.persistence.internal.expressions.SQLSelectStatement statement)

INTERNAL: called from SQLSelectStatement.writeFieldsFromExpression(...)

writeSubexpressionsTo

public void writeSubexpressionsTo(BufferedWriter writer,
 int indent)
                           throws IOException

INTERNAL: Used in SQL printing.

Throws:

IOException

any

public Expression any(byte[] theBytes)

PUBLIC: Return an expression that is used with a comparison expression. The ANY keyword denotes that the search condition is TRUE if the comparison is TRUE for at least one of the values that is returned. If the subquery returns no value, the search condition is FALSE

any

public Expression any(char[] theChars)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

any

public Expression any(double[] theDoubles)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

any

public Expression any(float[] theFloats)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

any

public Expression any(int[] theInts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

any

public Expression any(long[] theLongs)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

any

public Expression any(Object[] theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

any

public Expression any(short[] theShorts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

any

public Expression any(boolean[] theBooleans)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

any

public Expression any(List theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

Example:

     EclipseLink: employee.get("age").in(ages)
     Java: ages.contains(employee.getAge())
     SQL: AGE IN (55, 18, 30)
 

any

public Expression any(Expression arguments)

union

public Expression union(Expression arguments)

PUBLIC: Return a union expression with the subquery.

intersect

public Expression intersect(ReportQuery query)

PUBLIC: Return a intersect expression with the subquery.

intersectAll

public Expression intersectAll(ReportQuery query)

PUBLIC: Return a intersect all expression with the subquery.

intersect

public Expression intersect(Expression arguments)

PUBLIC: Return a intersect expression with the subquery.

except

public Expression except(ReportQuery query)

PUBLIC: Return a except expression with the subquery.

exceptAll

public Expression exceptAll(ReportQuery query)

PUBLIC: Return a except all expression with the subquery.

except

public Expression except(Expression arguments)

PUBLIC: Return a except expression with the subquery.

union

public Expression union(ReportQuery query)

PUBLIC: Return a union expression with the subquery.

unionAll

public Expression unionAll(ReportQuery query)

PUBLIC: Return a union all expression with the subquery.

unionAll

public Expression unionAll(Expression arguments)

PUBLIC: Return a union all expression with the subquery.

intersectAll

public Expression intersectAll(Expression arguments)

PUBLIC: Return a intersect all expression with the subquery.

exceptAll

public Expression exceptAll(Expression arguments)

PUBLIC: Return a except all expression with the subquery.

any

public Expression any(ReportQuery subQuery)

some

public Expression some(byte[] theBytes)

PUBLIC: Return an expression that is used with a comparison expression. The SOME keyword denotes that the search condition is TRUE if the comparison is TRUE for at least one of the values that is returned. If the subquery returns no value, the search condition is FALSE

some

public Expression some(char[] theChars)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

some

public Expression some(double[] theDoubles)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

some

public Expression some(float[] theFloats)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

some

public Expression some(int[] theInts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

some

public Expression some(long[] theLongs)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

some

public Expression some(Object[] theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

some

public Expression some(short[] theShorts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

some

public Expression some(boolean[] theBooleans)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

some

public Expression some(List theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

Example:

     EclipseLink: employee.get("age").in(ages)
     Java: ages.contains(employee.getAge())
     SQL: AGE IN (55, 18, 30)
 

some

public Expression some(Expression arguments)

some

public Expression some(ReportQuery subQuery)

all

public Expression all(byte[] theBytes)

PUBLIC: Return an expression that is used with a comparison expression. The SOME keyword denotes that the search condition is TRUE if the comparison is TRUE for at least one of the values that is returned. If the subquery returns no value, the search condition is FALSE

all

public Expression all(char[] theChars)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

all

public Expression all(double[] theDoubles)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

all

public Expression all(float[] theFloats)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

all

public Expression all(int[] theInts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

all

public Expression all(long[] theLongs)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

all

public Expression all(Object[] theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

all

public Expression all(short[] theShorts)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

all

public Expression all(boolean[] theBooleans)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

all

public Expression all(List theObjects)

PUBLIC: Return an expression that checks if the receivers value is contained in the collection. This is equivalent to the SQL "IN" operator and Java "contains" operator.

Example:

     EclipseLink: employee.get("age").in(ages)
     Java: ages.contains(employee.getAge())
     SQL: AGE IN (55, 18, 30)
 

all

public Expression all(Expression arguments)

all

public Expression all(ReportQuery subQuery)

getLeafDescriptor

public ClassDescriptor getLeafDescriptor(DatabaseQuery query,
 ClassDescriptor rootDescriptor,
 org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: Lookup the descriptor for this item by traversing its expression recursively.

getLeafMapping

public DatabaseMapping getLeafMapping(DatabaseQuery query,
 ClassDescriptor rootDescriptor,
 org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: Lookup the mapping for this item by traversing its expression recursively. If an aggregate of foreign mapping is found it is traversed.