org.eclipse.persistence.platform.database.oracle
Class OraclePlatform

java.lang.Object
  org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform
      org.eclipse.persistence.internal.databaseaccess.DatabasePlatform
          org.eclipse.persistence.platform.database.DatabasePlatform
              org.eclipse.persistence.platform.database.oracle.OraclePlatform

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, org.eclipse.persistence.internal.databaseaccess.Platform

public class OraclePlatform
extends DatabasePlatform

Purpose: Provides Oracle specific behavior.

Responsibilities:

• Native SQL for byte[], Date, Time, & Timestamp.
• Native sequencing named sequences.
• Native SQL/ROWNUM support for MaxRows and FirstResult filtering.

See Also:

Serialized Form

Since:

TOPLink/Java 1.0

Field Summary

protected boolean	supportsIdentity Advanced attribute indicating whether identity is supported, see comment to setSupportsIdentity method.
protected boolean	useRownumFiltering Oracle's Rownum can be used to limit results and for pagination, using the query's maxRows and FirstResult settings

Fields inherited from class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

classTypes, cursorCode, DEFAULT_MAX_BATCH_WRITING_SIZE, DEFAULT_PARAMETERIZED_MAX_BATCH_WRITING_SIZE, fieldTypes, maxBatchWritingSize, pingSQL, shouldBindAllParameters, shouldCacheAllStatements, shouldForceFieldNamesToUpperCase, shouldIgnoreCaseOnFieldComparisons, shouldOptimizeDataConversion, shouldTrimStrings, statementCacheSize, stringBindingSize, structConverters, supportsAutoCommit, transactionIsolation, typeConverters, usesBatchWriting, usesByteArrayBinding, usesJDBCBatchWriting, usesNativeBatchWriting, usesNativeSQL, usesStreamsForBinding, usesStringBinding

Fields inherited from class org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform

conversionManager, dataTypesConvertedFromAClass, dataTypesConvertedToAClass, defaultSequence, platformOperators, sequences, tableQualifier, timestampQuery

Constructor Summary

OraclePlatform()

Method Summary

boolean	allowsSizeInProcedureArguments()
protected void	appendByteArray(byte[] bytes, java.io.Writer writer) INTERNAL: If using native SQL then print a byte[] literally as a hex string otherwise use ODBC format as provided in DatabasePlatform.
protected void	appendCalendar(java.util.Calendar calendar, java.io.Writer writer) INTERNAL: Appends an Oracle specific Timestamp, if usesNativeSQL is true otherwise use the ODBC format.
protected void	appendDate(java.sql.Date date, java.io.Writer writer) INTERNAL: Appends an Oracle specific date if usesNativeSQL is true otherwise use the ODBC format.
protected void	appendTime(java.sql.Time time, java.io.Writer writer) INTERNAL: Appends an Oracle specific time if usesNativeSQL is true otherwise use the ODBC format.
protected void	appendTimestamp(java.sql.Timestamp timestamp, java.io.Writer writer) INTERNAL: Appends an Oracle specific Timestamp, if usesNativeSQL is true otherwise use the ODBC format.
ExpressionOperator	atan2Operator() INTERNAL: Build operator.
org.eclipse.persistence.internal.databaseaccess.DatabaseCall	buildCallWithReturning(SQLCall sqlCall, java.util.Vector returnFields) INTERNAL: Returns null unless the platform supports call with returning
protected java.util.Hashtable	buildFieldTypes() INTERNAL:
ValueReadQuery	buildSelectQueryForIdentity(java.lang.String seqName, java.lang.Integer size) INTERNAL: Though Oracle doesn't support identity it could be immitated, see comment to setSupportsIdentity method.
ValueReadQuery	buildSelectQueryForSequenceObject(java.lang.String seqName, java.lang.Integer size) INTERNAL: Produce a DataReadQuery which updates(!)
java.io.Writer	buildSequenceObjectAlterIncrementWriter(java.io.Writer writer, java.lang.String fullSeqName, int increment) INTERNAL: Override this method if the platform supports sequence objects and isAlterSequenceObjectSupported returns true.
java.io.Writer	buildSequenceObjectCreationWriter(java.io.Writer writer, java.lang.String fullSeqName, int increment, int start) INTERNAL: Override this method if the platform supports sequence objects.
java.io.Writer	buildSequenceObjectDeletionWriter(java.io.Writer writer, java.lang.String fullSeqName) INTERNAL: Override this method if the platform supports sequence objects.
boolean	canBuildCallWithReturning() INTERNAL: Indicates whether the platform can build call with returning.
boolean	canUnwrapOracleConnection() INTERNAL: Indicates whether this Oracle platform can unwrap Oracle connection.
protected ExpressionOperator	currentDateOperator()
protected ExpressionOperator	currentTimeOperator()
java.lang.String	getAssignmentString() INTERNAL: Used for stored function calls.
java.lang.String	getBatchBeginString() Used for batch writing and sp defs.
java.lang.String	getBatchEndString() Used for batch writing and sp defs.
java.lang.String	getDeclareBeginString() INTERNAL: DECLARE stanza header for Anonymous PL/SQL block
int	getMaxFieldNameSize() INTERNAL: returns the maximum number of characters that can be used in a field name on this platform.
java.util.Vector	getNativeTableInfo(java.lang.String table, java.lang.String creator, org.eclipse.persistence.internal.sessions.AbstractSession session) Return the catalog information through using the native SQL catalog selects.
java.lang.Object	getObjectFromResultSet(java.sql.ResultSet resultSet, int columnNumber, int type, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: Get a timestamp value from a result set.
java.lang.String	getProcedureArgumentSetter() Used for sp calls.
java.lang.String	getProcedureCallHeader() Used for sp calls.
java.lang.String	getProcedureCallTail() Used for sp calls.
java.lang.String	getSelectForUpdateString()
java.lang.String	getStoredProcedureParameterPrefix()
java.lang.String	getStoredProcedureTerminationToken()
ValueReadQuery	getSystemChangeNumberQuery() PUBLIC: The query to select the current system change number from Oracle.
ValueReadQuery	getTimestampQuery() PUBLIC: This method returns the query to select the timestamp from the server for Oracle.
protected void	initializePlatformOperators() Initialize any platform-specific operators
boolean	isAlterSequenceObjectSupported() INTERNAL: Override this method if the platform supports sequence objects and it's possible to alter sequence object's increment in the database.
boolean	isOracle()
protected ExpressionOperator	logOperator() Create the log operator for this platform
java.util.Hashtable	maximumNumericValues() Builds a table of maximum numeric values keyed on java class.
java.util.Hashtable	minimumNumericValues() Builds a table of minimum numeric values keyed on java class.
protected ExpressionOperator	operatorLocate() INTERNAL: Override the default locate operator
protected ExpressionOperator	operatorLocate2() INTERNAL: Override the default locate operator
protected ExpressionOperator	operatorOuterJoin() Create the outer join operator for this platform
void	printFieldNullClause(java.io.Writer writer) INTERNAL: Append the receiver's field 'NULL' constraint clause to a writer.
void	printSQLSelectStatement(org.eclipse.persistence.internal.databaseaccess.DatabaseCall call, org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer, org.eclipse.persistence.internal.expressions.SQLSelectStatement statement) INTERNAL: Print the SQL representation of the statement on a stream, storing the fields in the DatabaseCall.
java.lang.String	serverTimestampString() Return the current date and time from the server.
void	setShouldUseRownumFiltering(boolean useRownumFiltering) PUBLIC: Set if Oracle ROWNUM pagination should be used for FirstResult and MaxRows settings.
void	setSupportsIdentity(boolean supportsIdentity) ADVANCED: Oracle db doesn't support identity.
boolean	shouldPrintOuterJoinInWhereClause() Some database require outer joins to be given in the where clause, others require it in the from clause.
boolean	shouldUseJDBCOuterJoinSyntax() JDBC defines and outer join syntax, many drivers do not support this.
boolean	shouldUseRownumFiltering() PUBLIC: Return if Oracle ROWNUM pagination should be used for FirstResult and MaxRows settings.
boolean	supportsIdentity() INTERNAL: Indicates whether the platform supports identity.
boolean	supportsSelectForUpdateNoWait() Returns true if the database supports SQL syntax not to wait on a SELECT..FOR UPADTE (i.e.
boolean	supportsSequenceObjects() INTERNAL: Indicates whether the platform supports sequence objects.
boolean	supportsStoredFunctions() INTERNAL: Return if database stored functions are supported.
protected ExpressionOperator	todayOperator() Create the sysdate operator for this platform
java.sql.Connection	unwrapOracleConnection(java.sql.Connection connection) INTERNAL: If can unwrap returns unwrapped Oracle connection, otherwise original connection.
boolean	wasFailureCommunicationBased(java.sql.SQLException exception, java.sql.Connection connection, org.eclipse.persistence.internal.sessions.AbstractSession sessionForProfile) INTERNAL: A call to this method will perform a platform based check on the connection and exception error code to determine if the connection is still valid or if a communication error has occurred.

Methods inherited from class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

addBatch, addStructConverter, appendBoolean, appendLiteralToCall, appendLiteralToCallWithBinding, appendNumber, appendParameter, appendParameterInternal, appendString, autoCommit, beginTransaction, buildClassTypes, buildProcedureCallString, buildSelectQueryForIdentity, buildSelectQueryForSequenceObject, commitTransaction, convertToDatabaseType, copyInto, createArray, createArray, createPlatformDefaultSequence, createStruct, createStruct, dontBindUpdateAllQueryUsingTempTables, executeBatch, executeStoredProcedure, getBatchDelimiterString, getClassTypes, getConnection, getConstraintDeletionString, getCreateTempTableSqlBodyForTable, getCreateTempTableSqlPrefix, getCreateTempTableSqlSuffix, getCreateViewString, getCreationInOutputProcedureToken, getCreationOutputProcedureToken, getCursorCode, getCustomModifyValueForCall, getFieldTypeDefinition, getFieldTypes, getFunctionCallHeader, getIdentifierQuoteCharacter, getInOutputProcedureToken, getJDBCOuterJoinString, getJDBCType, getJDBCType, getJdbcTypeName, getMaxBatchWritingSize, getMaxForeignKeyNameSize, getMaxUniqueKeyNameSize, getNoWaitString, getOutputProcedureToken, getPingSQL, getProcedureArgumentString, getProcedureAsString, getProcedureBeginString, getProcedureEndString, getQualifiedName, getQualifiedSequenceTableName, getRefValue, getRefValue, getSelectForUpdateNoWaitString, getSelectForUpdateOfString, getSequenceCounterFieldName, getSequenceNameFieldName, getSequencePreallocationSize, getSequenceTableName, getStatementCacheSize, getStringBindingSize, getStructConverters, getTempTableForTable, getTransactionIsolation, getTypeConverters, isInformixOuterJoin, isNullAllowedInSelectClause, isXDBDocument, prepareBatchStatement, printFieldIdentityClause, printFieldNotNullClause, printFieldTypeSize, printFieldTypeSize, printFieldUnique, printFieldUnique, printValuelist, printValuelist, processResultSet, registerOutputParameter, requiresNamedPrimaryKeyConstraints, requiresProcedureCallBrackets, requiresProcedureCallOuputToken, requiresTypeNameToRegisterOutputParameter, rollbackTransaction, setClassTypes, setCursorCode, setFieldTypes, setMaxBatchWritingSize, setParameterValueInDatabaseCall, setPingSQL, setSequenceCounterFieldName, setSequenceNameFieldName, setSequenceTableName, setShouldBindAllParameters, setShouldCacheAllStatements, setShouldForceFieldNamesToUpperCase, setShouldIgnoreCaseOnFieldComparisons, setShouldOptimizeDataConversion, setShouldTrimStrings, setStatementCacheSize, setStringBindingSize, setSupportsAutoCommit, setTransactionIsolation, setUsesBatchWriting, setUsesByteArrayBinding, setUsesJDBCBatchWriting, setUsesNativeBatchWriting, setUsesNativeSQL, setUsesStreamsForBinding, setUsesStringBinding, shouldAlwaysUseTempStorageForModifyAll, shouldBindAllParameters, shouldBindLiterals, shouldCacheAllStatements, shouldForceFieldNamesToUpperCase, shouldIgnoreCaseOnFieldComparisons, shouldIgnoreException, shouldNativeSequenceUseTransaction, shouldOptimizeDataConversion, shouldPrintConstraintNameAfter, shouldPrintFieldIdentityClause, shouldPrintInOutputTokenBeforeType, shouldPrintLockingClauseAfterWhereClause, shouldPrintOutputTokenAtStart, shouldPrintOutputTokenBeforeType, shouldPrintStoredProcedureArgumentNameInCall, shouldTempTableSpecifyPrimaryKeys, shouldTrimStrings, shouldUseCustomModifyForCall, supportsAutoCommit, supportsForeignKeyConstraints, supportsGlobalTempTables, supportsLocalTempTables, supportsNativeSequenceNumbers, supportsPrimaryKeyConstraint, supportsTempTables, supportsUniqueKeyConstraints, usesBatchWriting, usesByteArrayBinding, usesJDBCBatchWriting, usesNativeBatchWriting, usesNativeSQL, usesSequenceTable, usesStreamsForBinding, usesStringBinding, writeAutoAssignmentSetClause, writeAutoJoinWhereClause, writeCleanUpTempTableSql, writeCreateTempTableSql, writeDeleteFromTargetTableUsingTempTableSql, writeFields, writeFieldsAutoClause, writeFieldsList, writeInsertIntoTableSql, writeJoinWhereClause, writeLOB, writeParameterMarker, writeUpdateOriginalFromTempTableSql

Methods inherited from class org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform

addOperator, addSequence, clone, convertObject, createConnectionCustomizer, createSequences, getConversionManager, getDataTypesConvertedFrom, getDataTypesConvertedTo, getDefaultSequence, getDefaultSequenceToWrite, getOperator, getPlatformOperators, getSelectSequenceQuery, getSequence, getSequences, getSequencesToWrite, getTableQualifier, getTimestampFromServer, getUpdateSequenceQuery, hasDefaultSequence, isAccess, isAttunity, isCloudscape, isDB2, isDBase, isDerby, isHSQL, isInformix, isMySQL, isODBC, isOracle9, isPointBase, isPostgreSQL, isSQLAnywhere, isSQLServer, isSybase, isTimesTen, isTimesTen7, removeAllSequences, removeSequence, sequencesAfterCloneCleanup, setConversionManager, setDefaultSequence, setSelectSequenceNumberQuery, setSequencePreallocationSize, setSequences, setTableQualifier, setTimestampQuery, setUpdateSequenceQuery, toString, usesPlatformDefaultSequence

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

useRownumFiltering

protected boolean useRownumFiltering

Oracle's Rownum can be used to limit results and for pagination, using the query's maxRows and FirstResult settings

supportsIdentity

protected boolean supportsIdentity

Advanced attribute indicating whether identity is supported, see comment to setSupportsIdentity method.

Constructor Detail

OraclePlatform

public OraclePlatform()

Method Detail

allowsSizeInProcedureArguments

public boolean allowsSizeInProcedureArguments()

Overrides:

allowsSizeInProcedureArguments in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

appendByteArray

protected void appendByteArray(byte[] bytes,
                               java.io.Writer writer)
                        throws java.io.IOException

INTERNAL: If using native SQL then print a byte[] literally as a hex string otherwise use ODBC format as provided in DatabasePlatform.

Overrides:

appendByteArray in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

java.io.IOException

appendDate

protected void appendDate(java.sql.Date date,
                          java.io.Writer writer)
                   throws java.io.IOException

INTERNAL: Appends an Oracle specific date if usesNativeSQL is true otherwise use the ODBC format. Native FORMAT: to_date('1997-11-06','yyyy-mm-dd')

Overrides:

appendDate in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

java.io.IOException

appendTime

protected void appendTime(java.sql.Time time,
                          java.io.Writer writer)
                   throws java.io.IOException

INTERNAL: Appends an Oracle specific time if usesNativeSQL is true otherwise use the ODBC format. Native FORMAT: to_date(#####, 'sssss').

Overrides:

appendTime in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

java.io.IOException

appendTimestamp

protected void appendTimestamp(java.sql.Timestamp timestamp,
                               java.io.Writer writer)
                        throws java.io.IOException

INTERNAL: Appends an Oracle specific Timestamp, if usesNativeSQL is true otherwise use the ODBC format. Native Format: to_date ('1997-11-06 10:35:45.0' , 'yyyy-mm-dd hh:mm:ss.n')

Overrides:

appendTimestamp in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

java.io.IOException

appendCalendar

protected void appendCalendar(java.util.Calendar calendar,
                              java.io.Writer writer)
                       throws java.io.IOException

INTERNAL: Appends an Oracle specific Timestamp, if usesNativeSQL is true otherwise use the ODBC format. Native Format: to_date ('1997-11-06 10:35:45.0' , 'yyyy-mm-dd hh:mm:ss.n')

Overrides:

appendCalendar in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

java.io.IOException

atan2Operator

public ExpressionOperator atan2Operator()

INTERNAL: Build operator.

buildFieldTypes

protected java.util.Hashtable buildFieldTypes()

INTERNAL:

Overrides:

buildFieldTypes in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

buildCallWithReturning

public org.eclipse.persistence.internal.databaseaccess.DatabaseCall buildCallWithReturning(SQLCall sqlCall,
                                                                                           java.util.Vector returnFields)

INTERNAL: Returns null unless the platform supports call with returning

Overrides:

buildCallWithReturning in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

canBuildCallWithReturning

public boolean canBuildCallWithReturning()

INTERNAL: Indicates whether the platform can build call with returning. In case this method returns true, buildCallWithReturning method may be called.

Overrides:

canBuildCallWithReturning in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getAssignmentString

public java.lang.String getAssignmentString()

INTERNAL: Used for stored function calls.

Overrides:

getAssignmentString in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getDeclareBeginString

public java.lang.String getDeclareBeginString()

INTERNAL: DECLARE stanza header for Anonymous PL/SQL block

getBatchBeginString

public java.lang.String getBatchBeginString()

Used for batch writing and sp defs.

Overrides:

getBatchBeginString in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getBatchEndString

public java.lang.String getBatchEndString()

Used for batch writing and sp defs.

Overrides:

getBatchEndString in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getMaxFieldNameSize

public int getMaxFieldNameSize()

INTERNAL: returns the maximum number of characters that can be used in a field name on this platform.

Overrides:

getMaxFieldNameSize in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getNativeTableInfo

public java.util.Vector getNativeTableInfo(java.lang.String table,
                                           java.lang.String creator,
                                           org.eclipse.persistence.internal.sessions.AbstractSession session)

Return the catalog information through using the native SQL catalog selects. This is required because many JDBC driver do not support meta-data. Willcards can be passed as arguments.

getProcedureArgumentSetter

public java.lang.String getProcedureArgumentSetter()

Used for sp calls.

Overrides:

getProcedureArgumentSetter in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getProcedureCallHeader

public java.lang.String getProcedureCallHeader()

Used for sp calls.

Overrides:

getProcedureCallHeader in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getProcedureCallTail

public java.lang.String getProcedureCallTail()

Used for sp calls.

Overrides:

getProcedureCallTail in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getSelectForUpdateString

public java.lang.String getSelectForUpdateString()

Overrides:

getSelectForUpdateString in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getStoredProcedureParameterPrefix

public java.lang.String getStoredProcedureParameterPrefix()

Overrides:

getStoredProcedureParameterPrefix in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getStoredProcedureTerminationToken

public java.lang.String getStoredProcedureTerminationToken()

Overrides:

getStoredProcedureTerminationToken in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getSystemChangeNumberQuery

public ValueReadQuery getSystemChangeNumberQuery()

PUBLIC: The query to select the current system change number from Oracle. In order to execute this query a database administrator may need to grant execute permission on pl/sql package DBMS_FLASHBACK.

getTimestampQuery

public ValueReadQuery getTimestampQuery()

PUBLIC: This method returns the query to select the timestamp from the server for Oracle.

Specified by:

getTimestampQuery in interface org.eclipse.persistence.internal.databaseaccess.Platform

Overrides:

getTimestampQuery in class org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform

getObjectFromResultSet

public java.lang.Object getObjectFromResultSet(java.sql.ResultSet resultSet,
                                               int columnNumber,
                                               int type,
                                               org.eclipse.persistence.internal.sessions.AbstractSession session)
                                        throws java.sql.SQLException

INTERNAL: Get a timestamp value from a result set. Overrides the default behavior to specifically return a timestamp. Added to overcome an issue with the oracle 9.0.1.4 JDBC driver.

Overrides:

getObjectFromResultSet in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

java.sql.SQLException

initializePlatformOperators

protected void initializePlatformOperators()

Initialize any platform-specific operators

Overrides:

initializePlatformOperators in class org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform

isOracle

public boolean isOracle()

Specified by:

isOracle in interface org.eclipse.persistence.internal.databaseaccess.Platform

Overrides:

isOracle in class org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform

logOperator

protected ExpressionOperator logOperator()

Create the log operator for this platform

maximumNumericValues

public java.util.Hashtable maximumNumericValues()

Builds a table of maximum numeric values keyed on java class. This is used for type testing but might also be useful to end users attempting to sanitize values.

NOTE: BigInteger & BigDecimal maximums are dependent upon their precision & Scale

Overrides:

maximumNumericValues in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

minimumNumericValues

public java.util.Hashtable minimumNumericValues()

Builds a table of minimum numeric values keyed on java class. This is used for type testing but might also be useful to end users attempting to sanitize values.

NOTE: BigInteger & BigDecimal minimums are dependent upon their precision & Scale

Overrides:

minimumNumericValues in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

buildSelectQueryForSequenceObject

public ValueReadQuery buildSelectQueryForSequenceObject(java.lang.String seqName,
                                                        java.lang.Integer size)

INTERNAL: Produce a DataReadQuery which updates(!) the sequence number in the db and returns it. Currently implemented on Oracle only.

Overrides:

buildSelectQueryForSequenceObject in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Parameters:

sequenceName - Name known by Oracle to be a defined sequence

buildSelectQueryForIdentity

public ValueReadQuery buildSelectQueryForIdentity(java.lang.String seqName,
                                                  java.lang.Integer size)

INTERNAL: Though Oracle doesn't support identity it could be immitated, see comment to setSupportsIdentity method.

Overrides:

buildSelectQueryForIdentity in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Parameters:

sequenceName - Name known by Oracle to be a defined sequence

operatorOuterJoin

protected ExpressionOperator operatorOuterJoin()

Create the outer join operator for this platform

operatorLocate

protected ExpressionOperator operatorLocate()

INTERNAL: Override the default locate operator

operatorLocate2

protected ExpressionOperator operatorLocate2()

INTERNAL: Override the default locate operator

printFieldNullClause

public void printFieldNullClause(java.io.Writer writer)
                          throws ValidationException

INTERNAL: Append the receiver's field 'NULL' constraint clause to a writer.

Overrides:

printFieldNullClause in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

ValidationException

serverTimestampString

public java.lang.String serverTimestampString()

Return the current date and time from the server.

setShouldUseRownumFiltering

public void setShouldUseRownumFiltering(boolean useRownumFiltering)

PUBLIC: Set if Oracle ROWNUM pagination should be used for FirstResult and MaxRows settings. Default is false.

shouldPrintOuterJoinInWhereClause

public boolean shouldPrintOuterJoinInWhereClause()

Some database require outer joins to be given in the where clause, others require it in the from clause.

Overrides:

shouldPrintOuterJoinInWhereClause in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

shouldUseJDBCOuterJoinSyntax

public boolean shouldUseJDBCOuterJoinSyntax()

JDBC defines and outer join syntax, many drivers do not support this. So we normally avoid it.

Overrides:

shouldUseJDBCOuterJoinSyntax in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

shouldUseRownumFiltering

public boolean shouldUseRownumFiltering()

PUBLIC: Return if Oracle ROWNUM pagination should be used for FirstResult and MaxRows settings. Default is false.

supportsSequenceObjects

public boolean supportsSequenceObjects()

INTERNAL: Indicates whether the platform supports sequence objects. This method is to be used *ONLY* by sequencing classes

Overrides:

supportsSequenceObjects in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

supportsIdentity

public boolean supportsIdentity()

INTERNAL: Indicates whether the platform supports identity. This method is to be used *ONLY* by sequencing classes

Overrides:

supportsIdentity in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

setSupportsIdentity

public void setSupportsIdentity(boolean supportsIdentity)

ADVANCED: Oracle db doesn't support identity. However it's possible to get identity-like behavior using sequence in an insert trigger - that's the only case when supportsIdentity should be set to true: in this case all the sequences that have shouldAcquireValueAfterInsert set to true will keep this setting (it would've been reversed in case identity is not supported). Note that with supportsIdentity==true attempt to create tables that have identity fields will fail - Oracle doesn't support identity. Therefore if there's table creation reqiured it should be done with supportsIdentity==false, then set the flag to true and reset sequencing (or logout and login the session).

supportsStoredFunctions

public boolean supportsStoredFunctions()

INTERNAL: Return if database stored functions are supported.

Overrides:

supportsStoredFunctions in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

supportsSelectForUpdateNoWait

public boolean supportsSelectForUpdateNoWait()

Returns true if the database supports SQL syntax not to wait on a SELECT..FOR UPADTE (i.e. In Oracle adding NOWAIT to the end will accomplish this)

todayOperator

protected ExpressionOperator todayOperator()

Create the sysdate operator for this platform

currentDateOperator

protected ExpressionOperator currentDateOperator()

currentTimeOperator

protected ExpressionOperator currentTimeOperator()

canUnwrapOracleConnection

public boolean canUnwrapOracleConnection()

INTERNAL: Indicates whether this Oracle platform can unwrap Oracle connection.

unwrapOracleConnection

public java.sql.Connection unwrapOracleConnection(java.sql.Connection connection)

INTERNAL: If can unwrap returns unwrapped Oracle connection, otherwise original connection.

printSQLSelectStatement

public void printSQLSelectStatement(org.eclipse.persistence.internal.databaseaccess.DatabaseCall call,
                                    org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer,
                                    org.eclipse.persistence.internal.expressions.SQLSelectStatement statement)

INTERNAL: Print the SQL representation of the statement on a stream, storing the fields in the DatabaseCall. This implementation works MaxRows and FirstResult into the SQL using Oracle's ROWNUM to filter values if shouldUseRownumFiltering is true.

Overrides:

printSQLSelectStatement in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

buildSequenceObjectCreationWriter

public java.io.Writer buildSequenceObjectCreationWriter(java.io.Writer writer,
                                                        java.lang.String fullSeqName,
                                                        int increment,
                                                        int start)
                                                 throws java.io.IOException

INTERNAL: Override this method if the platform supports sequence objects. Returns sql used to create sequence object in the database.

Overrides:

buildSequenceObjectCreationWriter in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

java.io.IOException

buildSequenceObjectDeletionWriter

public java.io.Writer buildSequenceObjectDeletionWriter(java.io.Writer writer,
                                                        java.lang.String fullSeqName)
                                                 throws java.io.IOException

INTERNAL: Override this method if the platform supports sequence objects. Returns sql used to delete sequence object from the database.

Overrides:

buildSequenceObjectDeletionWriter in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

java.io.IOException

buildSequenceObjectAlterIncrementWriter

public java.io.Writer buildSequenceObjectAlterIncrementWriter(java.io.Writer writer,
                                                              java.lang.String fullSeqName,
                                                              int increment)
                                                       throws java.io.IOException

INTERNAL: Override this method if the platform supports sequence objects and isAlterSequenceObjectSupported returns true. Returns sql used to alter sequence object's increment in the database.

Overrides:

buildSequenceObjectAlterIncrementWriter in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

java.io.IOException

isAlterSequenceObjectSupported

public boolean isAlterSequenceObjectSupported()

INTERNAL: Override this method if the platform supports sequence objects and it's possible to alter sequence object's increment in the database.

Overrides:

isAlterSequenceObjectSupported in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

wasFailureCommunicationBased

public boolean wasFailureCommunicationBased(java.sql.SQLException exception,
                                            java.sql.Connection connection,
                                            org.eclipse.persistence.internal.sessions.AbstractSession sessionForProfile)

INTERNAL: A call to this method will perform a platform based check on the connection and exception error code to determine if the connection is still valid or if a communication error has occurred. If a communication error has occurred then the query may be retried. If this platform is unable to determine if the error was communication based it will return false forcing the error to be thrown to the user.

Overrides:

wasFailureCommunicationBased in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform