Package org.eclipse.persistence.queries

Class ObjectLevelReadQuery

java.lang.Object
org.eclipse.persistence.queries.DatabaseQuery
org.eclipse.persistence.queries.ReadQuery
org.eclipse.persistence.queries.ObjectBuildingQuery
org.eclipse.persistence.queries.ObjectLevelReadQuery
All Implemented Interfaces:
Serializable, Cloneable
Direct Known Subclasses:
ReadAllQuery, ReadObjectQuery
public abstract class ObjectLevelReadQuery extends ObjectBuildingQuery

Purpose: Abstract class for all read queries using objects.

Description: Contains common behavior for all read queries using objects.

See Also:
Author:
Yvon Lavoie

  • Field Details

    • READ

      public static final String READ
      Names of the possible lock mode types, JPA 1.0 and 2.0
      See Also:

    • WRITE

      public static final String WRITE
      See Also:

    • NONE

      public static final String NONE
      Names of the possible lock mode types, JPA 2.0 only
      See Also:

    • PESSIMISTIC_

      public static final String PESSIMISTIC_
      See Also:

    • PESSIMISTIC_READ

      public static final String PESSIMISTIC_READ
      See Also:

    • PESSIMISTIC_WRITE

      public static final String PESSIMISTIC_WRITE
      See Also:

    • PESSIMISTIC_FORCE_INCREMENT

      public static final String PESSIMISTIC_FORCE_INCREMENT
      See Also:

    • OPTIMISTIC

      public static final String OPTIMISTIC
      See Also:

    • OPTIMISTIC_FORCE_INCREMENT

      public static final String OPTIMISTIC_FORCE_INCREMENT
      See Also:

    • defaultBuilder

      protected ExpressionBuilder defaultBuilder
      Provide a default builder so that it's easier to be consistent

    • cacheUsage

      protected int cacheUsage
      Allow for the cache usage to be specified to enable in-memory querying.

    • UseDescriptorSetting

      public static final int UseDescriptorSetting
      See Also:

    • DoNotCheckCache

      public static final int DoNotCheckCache
      See Also:

    • CheckCacheByExactPrimaryKey

      public static final int CheckCacheByExactPrimaryKey
      See Also:

    • CheckCacheByPrimaryKey

      public static final int CheckCacheByPrimaryKey
      See Also:

    • CheckCacheThenDatabase

      public static final int CheckCacheThenDatabase
      See Also:

    • CheckCacheOnly

      public static final int CheckCacheOnly
      See Also:

    • ConformResultsInUnitOfWork

      public static final int ConformResultsInUnitOfWork
      See Also:

    • additionalFields

      protected List<Object> additionalFields
      Allow for additional fields to be selected, used for m-m batch reading. Can contain DatabaseField or Expression.

    • shouldIncludeData

      protected boolean shouldIncludeData
      Allow for a complex result to be return including the rows and objects, used for m-m batch reading.

    • isPrePrepared

      protected boolean isPrePrepared
      Allow a prePrepare stage to build the expression for EJBQL and QBE and resolve joining.

    • distinctState

      protected short distinctState
      Indicates if distinct should be used or not.

    • UNCOMPUTED_DISTINCT

      public static final short UNCOMPUTED_DISTINCT
      See Also:

    • USE_DISTINCT

      public static final short USE_DISTINCT
      See Also:

    • DONT_USE_DISTINCT

      public static final short DONT_USE_DISTINCT
      See Also:

    • inMemoryQueryIndirectionPolicy

      protected int inMemoryQueryIndirectionPolicy
      Used to determine behavior of indirection in in-memory querying and conforming.

    • fetchGroup

      protected FetchGroup fetchGroup
      FetchGroup specified on this query. When set this FetchGroup will override the fetchGroupName and the use of the descriptor's FetchGroupManager.getDefaultFetchGroup()

    • fetchGroupName

      protected String fetchGroupName
      Name of FetchGroup stored in the FetchGroupManager of the reference class' descriptor or any of its parent descriptors.

    • shouldUseDefaultFetchGroup

      protected boolean shouldUseDefaultFetchGroup
      Flag to turn on/off the use of the default fetch group.

    • loadGroup

      protected LoadGroup loadGroup
      Specifies indirection that should be instantiated before returning result

    • nonFetchJoinAttributeExpressions

      protected List<Expression> nonFetchJoinAttributeExpressions
      Stores the non fetchjoin attributes, these are joins that will be represented in the where clause but not in the select.

    • partialAttributeExpressions

      protected List<Expression> partialAttributeExpressions
      Stores the partial attributes that have been added to this query

    • joinedAttributeManager

      protected org.eclipse.persistence.internal.queries.JoinedAttributeManager joinedAttributeManager
      Stores the helper object for dealing with joined attributes

    • batchFetchPolicy

      protected BatchFetchPolicy batchFetchPolicy
      Defines batch fetching configuration.

    • isReferenceClassLocked

      protected Boolean isReferenceClassLocked
      PERF: Caches locking policy isReferenceClassLocked setting.

    • isResultSetOptimizedQuery

      protected boolean isResultSetOptimizedQuery
      PERF: Allow queries to build directly from the database result-set.

    • isResultSetAccessOptimizedQuery

      protected Boolean isResultSetAccessOptimizedQuery
      PERF: Allow queries to build while accessing the database result-set. Skips accessing result set non-pk fields in case the cached object is found. If ResultSet optimization is used (isResultSetOptimizedQuery is set to true) then ResultSet Access optimization is ignored.

    • isResultSetAccessOptimizedQueryDefault

      public static boolean isResultSetAccessOptimizedQueryDefault
      If neither query specifies isResultSetOptimizedQuery nor session specifies shouldOptimizeResultSetAccess then this value is used to indicate whether optimization should be attempted

    • usesResultSetAccessOptimization

      protected transient Boolean usesResultSetAccessOptimization
      PERF: Indicates whether the query is actually using ResultSet optimization. If isResultSetOptimizedQuery==null set automatically before executing call.

    • isReadOnly

      protected boolean isReadOnly
      PERF: Allow queries to be defined as read-only in unit of work execution.

    • shouldOuterJoinSubclasses

      protected Boolean shouldOuterJoinSubclasses
      Define if an outer join should be used to read subclasses.

    • concreteSubclassCalls

      protected Map<Class,org.eclipse.persistence.internal.databaseaccess.DatabaseCall> concreteSubclassCalls
      Allow concrete subclasses calls to be prepared and cached for inheritance queries.

    • concreteSubclassQueries

      protected Map<Class,DatabaseQuery> concreteSubclassQueries
      Allow concrete subclasses queries to be prepared and cached for inheritance queries.

    • aggregateQueries

      protected Map<DatabaseMapping,ObjectLevelReadQuery> aggregateQueries
      Allow aggregate queries to be prepared and cached.

    • concreteSubclassJoinedMappingIndexes

      protected Map<Class,Map<DatabaseMapping,Object>> concreteSubclassJoinedMappingIndexes
      Allow concrete subclasses joined mapping indexes to be prepared and cached for inheritance queries.

    • lockModeType

      protected String lockModeType
      Used when specifying a lock mode for the query

    • waitTimeout

      protected Integer waitTimeout
      waitTimeout has three possible setting: null, 0 and 1..N null: use the session.getPessimisticLockTimeoutDefault() if available. 0: issue a LOCK_NOWAIT 1..N: use this value to set the WAIT clause.

    • waitTimeoutUnit

      protected TimeUnit waitTimeoutUnit

    • orderByExpressions

      protected List<Expression> orderByExpressions
      Used for ordering support.

    • shouldExtendPessimisticLockScope

      protected boolean shouldExtendPessimisticLockScope
      Indicates whether pessimistic lock should also be applied to relation tables (ManyToMany and OneToOne mappings), reference tables (DirectCollection and AggregateCollection mapping).

    • unionExpressions

      protected List<Expression> unionExpressions
      Allow a query's results to be unioned (UNION, INTERSECT, EXCEPT) with another query results.

    • isCachedExpressionQuery

      protected boolean isCachedExpressionQuery
      Indicates whether the query is cached as an expression query in descriptor's query manager.

    • shouldUseSerializedObjectPolicyDefault

      public static boolean shouldUseSerializedObjectPolicyDefault
      default value for shouldUseSerializedObjectPolicy

    • shouldUseSerializedObjectPolicy

      protected boolean shouldUseSerializedObjectPolicy
      Indicates whether the query should use SerializedObjectPolicy if descriptor has it.

  • Constructor Details

    • ObjectLevelReadQuery

      public ObjectLevelReadQuery()
      INTERNAL: Initialize the state of the query

  • Method Details

    • union

      public void union(ReportQuery query)
      PUBLIC: Union the query results with the other query.

    • intersect

      public void intersect(ReportQuery query)
      PUBLIC: Intersect the query results with the other query.

    • except

      public void except(ReportQuery query)
      PUBLIC: Except the query results with the other query.

    • addUnionExpression

      public void addUnionExpression(Expression union)
      PUBLIC: Add the union expression to the query. A union expression must be created with the query's expression builder and one of union/unionAll/intersect/intersectAll/except/exceptAll with a subquery expression.

    • getUnionExpressions

      public List<Expression> getUnionExpressions()
      Return any union expressions.

    • setUnionExpressions

      public void setUnionExpressions(List<Expression> unionExpressions)
      INTERNAL: Set any union expressions.

    • addDescendingOrdering

      public void addDescendingOrdering(String queryKeyName)
      PUBLIC: Order the query results by the object's attribute or query key name.

    • addOrdering

      public void addOrdering(Expression orderingExpression)
      PUBLIC: Add the ordering expression. This allows for ordering across relationships or functions. Example: readAllQuery.addOrdering(expBuilder.get("address").get("city").toUpperCase().descending())

    • equals

      public boolean equals(Object object)
      INTERNAL: Return if the query is equal to the other. This is used to allow dynamic expression query SQL to be cached.
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      INTERNAL: Compute a consistent hash-code for the expression. This is used to allow dynamic expression's SQL to be cached.
      Overrides:
      hashCode in class Object

    • isReadOnly

      public boolean isReadOnly()
      PUBLIC: Return if the query is read-only. This allows queries executed against a UnitOfWork to be read-only. This means the query will be executed against the Session, and the resulting objects will not be tracked for changes. The resulting objects are from the Session shared cache, and must not be modified.

    • setIsReadOnly

      public void setIsReadOnly(boolean isReadOnly)
      PUBLIC: Set the query to be read-only. This allows queries executed against a UnitOfWork to be read-only. This means the query will be executed against the Session, and the resulting objects will not be tracked for changes. The resulting objects are from the Session shared cache, and must not be modified.

    • setWaitTimeout

      public void setWaitTimeout(Integer waitTimeout)
      PUBLIC: Sets that this a pessimistic wait locking query.
      • ObjectBuildingQuery.LOCK: SELECT .... FOR UPDATE WAIT issued.

      Fine Grained Locking: On execution the reference class and those of all joined attributes will be checked. If any of these have a PessimisticLockingPolicy set on their descriptor, they will be locked in a SELECT ... FOR UPDATE OF ... {NO WAIT}. Issues fewer locks and avoids setting the lock mode on each query.

      Example: readAllQuery.setSelectionCriteria(employee.get("address").equal("Ottawa"));

      • LOCK: all employees in Ottawa and all referenced Ottawa addresses will be locked and the lock will wait only the specified amount of time.
      See Also:

    • setWaitTimeoutUnit

      public void setWaitTimeoutUnit(TimeUnit waitTimeoutUnit)

    • checkCustomQueryFlag

      protected abstract Boolean checkCustomQueryFlag(org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow)
      INTERNAL: Check and return custom query flag. Custom query flag value is initialized when stored value is null. Called from checkForCustomQuery(AbstractSession, AbstractRecord) to retrieve custom query flag.
      Parameters:
      session - Current session.
      translationRow - Database record.
      Returns:
      Current custom query flag. Value shall never be null.

    • getReadQuery

      protected abstract ObjectLevelReadQuery getReadQuery()
      INTERNAL: Get custom read query from query manager. Called from checkForCustomQuery(AbstractSession, AbstractRecord) to retrieve custom read query.
      Returns:
      Custom read query from query manager.

    • checkForCustomQuery

      protected DatabaseQuery checkForCustomQuery(org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow)
      INTERNAL: Check to see if a custom query should be used for this query. This is done before the query is copied and prepared/executed. Value of null means there is none.
      Overrides:
      checkForCustomQuery in class DatabaseQuery
      Parameters:
      session - Current session.
      translationRow - Database record.
      Returns:
      Custom database query or null when custom database query is not set.

    • clone

      public Object clone()
      INTERNAL: Creates and returns a copy of this query.
      Overrides:
      clone in class ObjectBuildingQuery
      Returns:
      A clone of this instance.

    • deepClone

      public Object deepClone()
      INTERNAL: Clone the query, including its selection criteria.

      Normally selection criteria are not cloned here as they are cloned later on during prepare.

      Overrides:
      deepClone in class ObjectBuildingQuery

    • acquireLocks

      public void acquireLocks()
      PUBLIC: Set the query to lock, this will also turn refreshCache on.

    • acquireLocksWithoutWaiting

      public void acquireLocksWithoutWaiting()
      PUBLIC: Set the query to lock without waiting (blocking), this will also turn refreshCache on.

    • addAdditionalField

      public void addAdditionalField(org.eclipse.persistence.internal.helper.DatabaseField field)
      INTERNAL: Additional fields can be added to a query. This is used in m-m batch reading to bring back the key from the join table.

    • addAdditionalField

      public void addAdditionalField(Expression fieldExpression)
      INTERNAL: Additional fields can be added to a query. This is used in m-m batch reading to bring back the key from the join table.

    • addJoinedAttribute

      public void addJoinedAttribute(String attributeName)
      PUBLIC: Specify the relationship attribute to be join fetched in this query. The query will join the object(s) being read with the attribute, this allows all of the data required for the object(s) to be read in a single query instead of (n) queries. This should be used when the application knows that it requires the part for all of the objects being read.

      Note: This cannot be used for objects where it is possible not to have a part, as these objects will be omitted from the result set, unless an outer join is used through passing and expression using "getAllowingNull". To join fetch collection relationships use the addJoinedAttribute(Expression) using "anyOf" to "anyOfAllowingNone".

      Example: query.addJoinedAttribute("address")

      See Also:

    • addJoinedAttribute

      public void addJoinedAttribute(Expression attributeExpression)
      PUBLIC: Specify the attribute to be join fetched in this query. The query will join the object(s) being read with the specified attribute, this allows all of the data required for the object(s) to be read in a single query instead of (n) queries. This should be used when the application knows that it requires the part for all of the objects being read.

      Note: This cannot be used for objects where it is possible not to have a part, as these objects will be omitted from the result set, unless an outer join is used through passing and expression using "getAllowingNull".

      Example: The following will fetch along with Employee(s) "Jones" all projects they participate in along with teamLeaders and their addresses, teamMembers and their phones. query.setSelectionCriteria(query.getExpressionBuilder().get("lastName").equal("Jones")); Expression projects = query.getExpressionBuilder().anyOf("projects"); query.addJoinedAttribute(projects); Expression teamLeader = projects.get("teamLeader"); query.addJoinedAttribute(teamLeader); Expression teamLeaderAddress = teamLeader.getAllowingNull("address"); query.addJoinedAttribute(teamLeaderAddress); Expression teamMembers = projects.anyOf("teamMembers"); query.addJoinedAttribute(teamMembers); Expression teamMembersPhones = teamMembers.anyOfAllowingNone("phoneNumbers"); query.addJoinedAttribute(teamMembersPhones); Note that: the order is essential: an expression should be added before any expression derived from it; the object is built once - it won't be rebuilt if it to be read again as a joined attribute: in the example the query won't get phones for "Jones" - even though they are among teamMembers (for whom phones are read).

    • addNonFetchJoinedAttribute

      public void addNonFetchJoinedAttribute(String attributeName)
      PUBLIC: Specify the relationship attribute to be join in this query. This allows the query results to be filtered based on the relationship join. The query will join the object(s) being read with the attribute. The difference between this and a joined fetched attribute is that it does not select the joined data nor populate the joined attribute, it is only used to filter the query results.

      Example: query.addNonFetchJoinedAttribute("address")

      See Also:

    • addNonFetchJoinedAttribute

      public void addNonFetchJoinedAttribute(Expression attributeExpression)
      PUBLIC: Specify the relationship attribute to be join in this query. This allows the query results to be filtered based on the relationship join. The query will join the object(s) being read with the attribute. The difference between this and a joined fetched attribute is that it does not select the joined data nor populate the joined attribute, it is only used to filter the query results.

      Example: query.addNonFetchJoinedAttribute(query.getExpressionBuilder().get("teamLeader").get("address"))

      See Also:

    • addNonFetchJoin

      public void addNonFetchJoin(Expression target)
      PUBLIC: Specify the object expression to be joined in this query. This allows the query results to be filtered based on the join to the object. The object should define an on clause that defines the join condition. This allows for two non-related objects to be joined.

      Example: (select all employees that are a team leader)

       ExpressionBuilder project = new ExpressionBuilder(Project.class);
 ExpressionBuilder employee = new ExpressionBuilder(Employee.class);
 ReadAllQuery query = new ReadAllQuery(Employee.class, employee);
 query.addJoin(project.on(project.get("teamLeader").equal(employee)))

    • addPartialAttribute

      @Deprecated public void addPartialAttribute(String attributeName)
      Deprecated.
      since EclipseLink 2.1, partial attributes replaced by fetch groups.
      PUBLIC: Specify that only a subset of the class' attributes be selected in this query.

      This allows for the query to be optimized through selecting less data.

      Partial objects will be returned from the query, where the unspecified attributes will be left null. The primary key will always be selected to allow re-querying of the whole object.

      Note: Because the object is not fully initialized it cannot be cached, and cannot be edited.

      Note: You cannot have 2 partial attributes of the same type. You also cannot add a partial attribute which is of the same type as the class being queried.

      Example: query.addPartialAttribute("firstName")

      See Also:

    • addSelectionFieldsForJoinedExpression

      protected void addSelectionFieldsForJoinedExpression(List fields, boolean isCustomSQL, Expression expression)
      INTERNAL: The method adds to the passed input vector the fields or expressions corresponding to the passed join expression.

    • setAsOfClause

      public void setAsOfClause(AsOfClause pastTime)
      ADVANCED: Sets the query to execute as of the past time. Both the query execution and result will conform to the database as it existed in the past.

      Equivalent to query.getSelectionCriteria().asOf(pastTime) called immediately before query execution.

      An as of clause at the query level will override any clauses set at the expression level. Useful in cases where the selection criteria is not known in advance, such as for query by example or primary key (selection object), or where you do not need to cache the result (report query).

      Ideally an as of clause at the session level is superior as query results can then be cached. You must set setShouldMaintainCache(false)

      To query all joined/batched attributes as of the same time set this.cascadeAllParts().

      Throws:
      QueryException - (at execution time) unless setShouldMaintainCache(false) is set. If some more recent data were in the cache, this would be returned instead, and both the cache and query result would become inconsistent.
      See Also:

    • addPartialAttribute

      @Deprecated public void addPartialAttribute(Expression attributeExpression)
      Deprecated.
      since EclipseLink 2.1, partial attributes replaced by fetch groups.
      PUBLIC: Specify that only a subset of the class' attributes be selected in this query.

      This allows for the query to be optimized through selecting less data.

      Partial objects will be returned from the query, where the unspecified attributes will be left null. The primary key will always be selected to allow re-querying of the whole object.

      Note: Because the object is not fully initialized it cannot be cached, and cannot be edited.

      Note: You cannot have 2 partial attributes of the same type. You also cannot add a partial attribute which is of the same type as the class being queried.

      Example: query.addPartialAttribute(query.getExpressionBuilder().get("address").get("city"))

      See Also:

    • buildObject

      public Object buildObject(org.eclipse.persistence.internal.sessions.AbstractRecord row)
      INTERNAL: Used to build the object, and register it if in the context of a unit of work.
      Overrides:
      buildObject in class ReadQuery

    • checkCacheOnly

      public void checkCacheOnly()
      PUBLIC: The cache will checked completely, if the object is not found null will be returned or an error if the query is too complex. Queries can be configured to use the cache at several levels. Other caching option are available.
      See Also:

    • checkDescriptor

      public void checkDescriptor(org.eclipse.persistence.internal.sessions.AbstractSession session) throws QueryException
      INTERNAL: Ensure that the descriptor has been set.
      Overrides:
      checkDescriptor in class DatabaseQuery
      Parameters:
      session - Current session.
      Throws:
      QueryException

    • checkEarlyReturnLocal

      protected abstract Object checkEarlyReturnLocal(org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow)
      INTERNAL: Contains the body of the check early return call, implemented by subclasses.

    • checkEarlyReturn

      public Object checkEarlyReturn(org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow)
      INTERNAL: Check to see if this query already knows the return value without performing any further work.
      Overrides:
      checkEarlyReturn in class DatabaseQuery

    • checkPrepare

      public void checkPrepare(org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow, boolean force)
      INTERNAL: Check to see if this query needs to be prepare and prepare it. The prepare is done on the original query to ensure that the work is not repeated.
      Overrides:
      checkPrepare in class DatabaseQuery

    • checkPrePrepare

      public void checkPrePrepare(org.eclipse.persistence.internal.sessions.AbstractSession session)
      INTERNAL: ObjectLevelReadQueries now have an explicit pre-prepare stage, which is for checking for pessimistic locking, and computing any joined attributes declared on the descriptor.

    • changeDescriptor

      public void changeDescriptor(org.eclipse.persistence.internal.sessions.AbstractSession theSession)
      INTERNAL: The reference class has been changed, need to reset the descriptor. Null out the current descriptor and call checkDescriptor Added Feb 27, 2001 JED for EJBQL feature

    • conformIndividualResult

      protected Object conformIndividualResult(Object clone, org.eclipse.persistence.internal.sessions.UnitOfWorkImpl unitOfWork, org.eclipse.persistence.internal.sessions.AbstractRecord arguments, Expression selectionCriteriaClone, Map alreadyReturned)
      INTERNAL: Conforms and registers an individual result. This instance could be one of the elements returned from a read all query, the result of a Read Object query, or an element read from a cursor.

      A result needs to be registered before it can be conformed, so registerIndividualResult is called here.

      Conforming on a result from the database is lenient. Since the object matched the query on the database we assume it matches here unless we can determine for sure that it was changed in this UnitOfWork not to conform.

      Parameters:
      clone - the clone to return
      arguments - the parameters this query was executed with
      selectionCriteriaClone - the expression to conform to. If was a selection object or key, null (which all conform to) is used
      alreadyReturned - a hashtable of objects already found by scanning the UnitOfWork cache for conforming instances. Prevents duplicates.
      unitOfWork - current UnitOfWork
      Returns:
      a clone, or null if result does not conform.

    • conformResultsInUnitOfWork

      public void conformResultsInUnitOfWork()
      PUBLIC: The cache will checked completely, if the object is not found the database will be queried, and the database result will be verified with what is in the cache and/or unit of work including new objects. This can lead to poor performance so it is recommended that only the database be queried in most cases. Queries can be configured to use the cache at several levels. Other caching option are available.
      See Also:

    • dontAcquireLocks

      public void dontAcquireLocks()
      PUBLIC: Set the query not to lock.

    • dontCheckCache

      public void dontCheckCache()
      PUBLIC: This can be used to explicitly disable the cache hit. The cache hit may not be desired in some cases, such as stored procedures that accept the primary key but do not query on it.

    • dontRefreshIdentityMapResult

      public void dontRefreshIdentityMapResult()
      PUBLIC: When unset means perform read normally and dont do refresh.
      Overrides:
      dontRefreshIdentityMapResult in class ObjectBuildingQuery

    • dontRefreshRemoteIdentityMapResult

      public void dontRefreshRemoteIdentityMapResult()
      PUBLIC: When unset means perform read normally and dont do refresh.
      Overrides:
      dontRefreshRemoteIdentityMapResult in class ObjectBuildingQuery

    • dontUseDistinct

      public void dontUseDistinct()
      ADVANCED: If a distinct has been set the DISTINCT clause will be printed. This is used internally by EclipseLink for batch reading but may also be used directly for advanced queries or report queries.

    • prepareOutsideUnitOfWork

      public DatabaseQuery prepareOutsideUnitOfWork(org.eclipse.persistence.internal.sessions.AbstractSession session)
      INTERNAL: There is a very special case where a query may be a bean-level pessimistic locking query.

      If that is so, only queries executed inside of a UnitOfWork should have a locking clause. In the extremely rare case that we execute a locking query outside of a UnitOfWork, must disable locking so that we do not get a fetch out of sequence error.

    • execute

      public Object execute(org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow) throws DatabaseException, OptimisticLockException
      INTERNAL: Execute the query. If there are objects in the cache return the results of the cache lookup.
      Overrides:
      execute in class DatabaseQuery
      Parameters:
      session - - the session in which the receiver will be executed.
      Returns:
      An object, the result of executing the query.
      Throws:
      DatabaseException - - an error has occurred on the database.
      OptimisticLockException - - an error has occurred using the optimistic lock feature.

    • executeDatabaseQuery

      public Object executeDatabaseQuery() throws DatabaseException
      INTERNAL: Executes the prepared query on the datastore.
      Specified by:
      executeDatabaseQuery in class DatabaseQuery
      Returns:
      - the result of executing the query.
      Throws:
      DatabaseException - - an error has occurred on the database.

    • executeObjectLevelReadQuery

      protected abstract Object executeObjectLevelReadQuery() throws DatabaseException
      Executes the prepared query on the datastore.
      Throws:
      DatabaseException

    • executeObjectLevelReadQueryFromResultSet

      protected abstract Object executeObjectLevelReadQueryFromResultSet() throws DatabaseException
      Executes the prepared query on the datastore.
      Throws:
      DatabaseException

    • executeInUnitOfWork

      public Object executeInUnitOfWork(org.eclipse.persistence.internal.sessions.UnitOfWorkImpl unitOfWork, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow) throws DatabaseException, OptimisticLockException
      INTERNAL: Execute the query in the unit of work. This allows any pre-execute checks to be done for unit of work queries.
      Overrides:
      executeInUnitOfWork in class DatabaseQuery
      Parameters:
      unitOfWork - - the session in which the receiver will be executed.
      translationRow - - the arguments
      Returns:
      An object, the result of executing the query.
      Throws:
      DatabaseException - - an error has occurred on the database.
      OptimisticLockException - - an error has occurred using the optimistic lock feature.

    • getAdditionalFields

      public List<Object> getAdditionalFields()
      INTERNAL: Additional fields can be added to a query. This is used in m-m batch reading to bring back the key from the join table.

    • getAsOfClause

      public AsOfClause getAsOfClause()
      ADVANCED: Answers the past time this query is 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:

    • getCacheUsage

      public int getCacheUsage()
      PUBLIC: Return the cache usage. By default only primary key read object queries will first check the cache before accessing the database. Any query can be configure to query against the cache completely, by key or ignore the cache check.

      Valid values are:

      • DoNotCheckCache
      • CheckCacheByExactPrimaryKey
      • CheckCacheByPrimaryKey
      • CheckCacheThenDatabase
      • CheckCacheOnly
      • ConformResultsInUnitOfWork
      • UseDescriptorSetting Note: UseDescriptorSetting functions like CheckCacheByPrimaryKey, except checks the appropriate descriptor's shouldDisableCacheHits setting when querying on the cache.

    • getDistinctState

      public short getDistinctState()
      ADVANCED: If a distinct has been set the DISTINCT clause will be printed. This is used internally by EclipseLink for batch reading but may also be used directly for advanced queries or report queries.

    • getExampleObject

      public Object getExampleObject()
      PUBLIC: This method returns the current example object. The "example" object is an actual domain object, provided by the client, from which an expression is generated. This expression is used for a query of all objects from the same class, that match the attribute values of the "example" object.

    • getExpressionBuilder

      public ExpressionBuilder getExpressionBuilder()
      REQUIRED: Get the expression builder which should be used for this query. This expression builder should be used to build all expressions used by this query.

    • setExpressionBuilder

      public void setExpressionBuilder(ExpressionBuilder builder)
      INTERNAL Sets the default expression builder for this query.

    • getInMemoryQueryIndirectionPolicyState

      public int getInMemoryQueryIndirectionPolicyState()
      PUBLIC: Returns the InMemoryQueryIndirectionPolicy for this query

    • getInMemoryQueryIndirectionPolicy

      public InMemoryQueryIndirectionPolicy getInMemoryQueryIndirectionPolicy()
      PUBLIC: Returns the InMemoryQueryIndirectionPolicy for this query

    • getJoinedAttributeManager

      public org.eclipse.persistence.internal.queries.JoinedAttributeManager getJoinedAttributeManager()
      INTERNAL: Return join manager responsible for managing all aspects of joining for the query. Queries without joining should not have a joinedAttributeManager.

    • setJoinedAttributeManager

      public void setJoinedAttributeManager(org.eclipse.persistence.internal.queries.JoinedAttributeManager joinedAttributeManager)
      INTERNAL: Set join manager responsible for managing all aspects of joining for the query.

    • hasJoining

      public boolean hasJoining()
      INTERNAL: Return if any attributes are joined. To avoid the initialization of the JoinedAttributeManager this should be first checked before accessing.

    • getJoinedAttributeExpressions

      public List getJoinedAttributeExpressions()
      INTERNAL: Convenience method for project mapping.

    • setJoinedAttributeExpressions

      public void setJoinedAttributeExpressions(List expressions)
      INTERNAL: Convenience method for project mapping.

    • getOrderByExpressions

      public List<Expression> getOrderByExpressions()
      INTERNAL: Return the order expressions for the query.

    • setOrderByExpressions

      public void setOrderByExpressions(List<Expression> orderByExpressions)
      INTERNAL: Set the order expressions for the query.

    • hasOrderByExpressions

      public boolean hasOrderByExpressions()
      INTERNAL: The order bys are lazy initialized to conserve space.

    • hasUnionExpressions

      public boolean hasUnionExpressions()
      INTERNAL: The unions are lazy initialized to conserve space.

    • shouldFilterDuplicates

      public boolean shouldFilterDuplicates()
      PUBLIC: Return if duplicate rows should be filter when using 1-m joining.

    • setShouldFilterDuplicates

      public void setShouldFilterDuplicates(boolean shouldFilterDuplicates)
      PUBLIC: Set if duplicate rows should be filter when using 1-m joining.

    • getLockingClause

      public org.eclipse.persistence.internal.expressions.ForUpdateClause getLockingClause()
      INTERNAL: It is not exactly as simple as a query being either locking or not. Any combination of the reference class object and joined attributes may be locked.

    • getNonFetchJoinAttributeExpressions

      public List<Expression> getNonFetchJoinAttributeExpressions()
      INTERNAL: Return the attributes that must be joined, but not fetched, that is, do not trigger the value holder.

    • getPartialAttributeExpressions

      public List<Expression> getPartialAttributeExpressions()
      INTERNAL: Return the partial attributes to select.

    • getQueryByExamplePolicy

      public QueryByExamplePolicy getQueryByExamplePolicy()
      PUBLIC: When using Query By Example, an instance of QueryByExamplePolicy is used to customize the query. The policy is useful when special operations are to be used for comparisons (notEqual, lessThan, greaterThan, like etc.), when a certain value is to be ignored, or when dealing with nulls.

    • getReferenceClass

      public Class getReferenceClass()
      PUBLIC: Return the reference class of the query.
      Overrides:
      getReferenceClass in class ObjectBuildingQuery

    • getReferenceClassName

      public String getReferenceClassName()
      INTERNAL: Return the reference class of the query.
      Overrides:
      getReferenceClassName in class ObjectBuildingQuery

    • hasAsOfClause

      public boolean hasAsOfClause()
      PUBLIC: Answers if the domain objects are to be read as of a past time.
      See Also:

    • hasNonFetchJoinedAttributeExpressions

      public boolean hasNonFetchJoinedAttributeExpressions()
      INTERNAL: Return the attributes that must be joined.

    • hasPartialAttributeExpressions

      public boolean hasPartialAttributeExpressions()
      INTERNAL: Return if partial attributes.
      Overrides:
      hasPartialAttributeExpressions in class ObjectBuildingQuery

    • hasAdditionalFields

      public boolean hasAdditionalFields()
      INTERNAL: Return if additional field.

    • getPartialAttributeSelectionFields

      public Vector getPartialAttributeSelectionFields(boolean isCustomSQL)
      INTERNAL: Return the fields required in the select clause, for patial attribute reading.

    • getFetchGroupNonNestedFieldsSet

      public Set<org.eclipse.persistence.internal.helper.DatabaseField> getFetchGroupNonNestedFieldsSet()
      INTERNAL: Return the set of fields required in the select clause, for fetch group reading.

    • getFetchGroupNonNestedFieldsSet

      public Set<org.eclipse.persistence.internal.helper.DatabaseField> getFetchGroupNonNestedFieldsSet(DatabaseMapping nestedMapping)
      INTERNAL: Return the set of fields required in the select clause, for fetch group reading.

    • getFetchGroupSelectionFields

      public List<org.eclipse.persistence.internal.helper.DatabaseField> getFetchGroupSelectionFields()
      INTERNAL: Return the fields required in the select clause, for fetch group reading.

    • getFetchGroupSelectionFields

      protected List<org.eclipse.persistence.internal.helper.DatabaseField> getFetchGroupSelectionFields(DatabaseMapping nestedMapping)
      INTERNAL: Return the fields required in the select clause, for fetch group reading. Top level (not nested) passes null instead of nestedMapping.

    • addJoinSelectionFields

      public void addJoinSelectionFields(Vector fields, boolean isCustomSQL)
      INTERNAL: The method adds to the passed input vector the fields or expressions corresponding to the joins.

    • getSelectionFields

      public Vector getSelectionFields()
      INTERNAL: Return the fields selected by the query. This includes the partial or joined fields. This is only used for custom SQL executions.

    • getWaitTimeout

      public Integer getWaitTimeout()
      PUBLIC: Return the WAIT timeout value of pessimistic locking query.

    • getWaitTimeoutUnit

      public TimeUnit getWaitTimeoutUnit()

    • initializeDefaultBuilder

      protected void initializeDefaultBuilder()
      Initialize the expression builder which should be used for this query. If there is a where clause, use its expression builder, otherwise generate one and cache it. This helps avoid unnecessary rebuilds.

    • isDistinctComputed

      public boolean isDistinctComputed()
      INTERNAL: return true if this query has computed its distinct value already

    • isLockQuery

      public boolean isLockQuery()
      PUBLIC: Answers if the query lock mode is known to be LOCK or LOCK_NOWAIT. In the case of DEFAULT_LOCK_MODE and the query reference class being a CMP entity bean, at execution time LOCK, LOCK_NOWAIT, or NO_LOCK will be decided.

      If a single joined attribute was configured for pessimistic locking then this will return true (after first execution) as the SQL contained a FOR UPDATE OF clause.

      Overrides:
      isLockQuery in class ObjectBuildingQuery

    • isLockQuery

      public boolean isLockQuery(Session session)
      ADVANCED: Answers if this query will issue any pessimistic locks.

      If the lock mode is not known (DEFAULT_LOCK_MODE / descriptor specified fine-grained locking) the lock mode will be determined now, to be either LOCK, LOCK_NOWAIT, or NO_LOCK.

      See Also:

    • isObjectLevelReadQuery

      public boolean isObjectLevelReadQuery()
      PUBLIC: Return if this is an object level read query.
      Overrides:
      isObjectLevelReadQuery in class DatabaseQuery

    • isPartialAttribute

      public boolean isPartialAttribute(String attributeName)
      INTERNAL: Return if partial attribute.

    • shouldExtendPessimisticLockScope

      public boolean shouldExtendPessimisticLockScope()
      INTERNAL: Indicates whether pessimistic lock should also be applied to relation tables (ManyToMany and OneToOne mappings), reference tables (DirectCollection and AggregateCollection mapping).

    • isPrePrepared

      protected boolean isPrePrepared()
      PUBLIC: Queries prepare common stated in themselves.

    • setIsPrePrepared

      public void setIsPrePrepared(boolean isPrePrepared)
      INTERNAL: If changes are made to the query that affect the derived SQL or Call parameters the query needs to be prepared again.

      Automatically called internally.

      The early phase of preparation is to check if this is a pessimistic locking query.

    • setShouldExtendPessimisticLockScope

      public void setShouldExtendPessimisticLockScope(boolean isExtended)
      INTERNAL: Indicates whether pessimistic lock should also be applied to relation tables (ManyToMany and OneToOne mappings), reference tables (DirectCollection and AggregateCollection mapping).

    • setIsPrepared

      public void setIsPrepared(boolean isPrepared)
      INTERNAL: Clear cached flags when un-preparing.
      Overrides:
      setIsPrepared in class DatabaseQuery

    • setIsPreparedKeepingSubclassData

      protected void setIsPreparedKeepingSubclassData(boolean isPrepared)
      INTERNAL: Clear cached flags when un-preparing. The method always keeps concrete subclass data (unlike setIsPrepared(false)).

    • prepare

      protected void prepare() throws QueryException
      INTERNAL: Prepare the receiver for execution in a session.
      Overrides:
      prepare in class ReadQuery
      Throws:
      QueryException

    • prepareFromCachedQuery

      protected boolean prepareFromCachedQuery()
      INTERNAL: Check if the query is cached and prepare from it. Return true if the query was cached.

    • copyFromQuery

      public void copyFromQuery(DatabaseQuery query)
      INTERNAL: Copy all setting from the query. This is used to morph queries from one type to the other. By default this calls prepareFromQuery, but additional properties may be required to be copied as prepareFromQuery only copies properties that affect the SQL.
      Overrides:
      copyFromQuery in class ObjectBuildingQuery

    • prepareFromQuery

      public void prepareFromQuery(DatabaseQuery query)
      INTERNAL: Prepare the query from the prepared query. This allows a dynamic query to prepare itself directly from a prepared query instance. This is used in the EJBQL parse cache to allow preparsed queries to be used to prepare dynamic queries. This only copies over properties that are configured through EJBQL.
      Overrides:
      prepareFromQuery in class ObjectBuildingQuery

    • prepareFetchGroup

      public void prepareFetchGroup() throws QueryException
      INTERNAL: Add mandatory attributes to fetch group, create entityFetchGroup.
      Throws:
      QueryException

    • prePrepare

      protected void prePrepare() throws QueryException
      INTERNAL: Prepare the receiver for execution in a session.
      Throws:
      QueryException

    • prepareQuery

      protected void prepareQuery() throws QueryException
      INTERNAL: Prepare the receiver for execution in a session.
      Throws:
      QueryException

    • prepareForRemoteExecution

      protected void prepareForRemoteExecution() throws QueryException
      INTERNAL: Prepare the receiver for execution in a session.
      Overrides:
      prepareForRemoteExecution in class DatabaseQuery
      Throws:
      QueryException

    • refreshIdentityMapResult

      public void refreshIdentityMapResult()
      PUBLIC: Refresh the attributes of the object(s) resulting from the query. If cascading is used the private parts of the objects will also be refreshed.
      Overrides:
      refreshIdentityMapResult in class ObjectBuildingQuery

    • refreshRemoteIdentityMapResult

      public void refreshRemoteIdentityMapResult()
      PUBLIC: Refresh the attributes of the object(s) resulting from the query. If cascading is used the private parts of the objects will also be refreshed.
      Overrides:
      refreshRemoteIdentityMapResult in class ObjectBuildingQuery

    • registerResultInUnitOfWork

      public abstract Object registerResultInUnitOfWork(Object result, org.eclipse.persistence.internal.sessions.UnitOfWorkImpl unitOfWork, org.eclipse.persistence.internal.sessions.AbstractRecord arguments, boolean buildDirectlyFromRows)
      INTERNAL: All objects queried via a UnitOfWork get registered here. If the query went to the database.

      Involves registering the query result individually and in totality, and hence refreshing / conforming is done here.

      Parameters:
      result - may be collection (read all) or an object (read one), or even a cursor. If in transaction the shared cache will be bypassed, meaning the result may not be originals from the parent but raw database rows.
      unitOfWork - the unitOfWork the result is being registered in.
      arguments - the original arguments/parameters passed to the query execution. Used by conforming
      buildDirectlyFromRows - If in transaction must construct a registered result from raw database rows.
      Returns:
      the final (conformed, refreshed, wrapped) UnitOfWork query result

    • resetDistinct

      public void resetDistinct()
      ADVANCED: If a distinct has been set the DISTINCT clause will be printed. This is used internally by TopLink for batch reading but may also be used directly for advanced queries or report queries.

    • setAdditionalFields

      public void setAdditionalFields(List<Object> additionalFields)
      INTERNAL: Additional fields can be added to a query. This is used in m-m batch reading to bring back the key from the join table.

    • shouldCheckCache

      public boolean shouldCheckCache()
      PUBLIC: Return if the cache should be checked.

    • setCacheUsage

      public void setCacheUsage(int cacheUsage)
      PUBLIC: Set the cache usage. By default only primary key read object queries will first check the cache before accessing the database. Any query can be configure to query against the cache completely, by key or ignore the cache check.

      Valid values are:

      • DoNotCheckCache - The query does not check the cache but accesses the database, the cache will still be maintain.
      • CheckCacheByExactPrimaryKey - If the query is exactly and only on the object's primary key the cache will be checked.
      • CheckCacheByPrimaryKey - If the query contains the primary key and possible other values the cache will be checked.
      • CheckCacheThenDatabase - The whole cache will be checked to see if there is any object matching the query, if not the database will be accessed.
      • CheckCacheOnly - The whole cache will be checked to see if there is any object matching the query, if not null or an empty collection is returned.
      • ConformResultsAgainstUnitOfWork - The results will be checked against the changes within the unit of work and object no longer matching or deleted will be remove, matching new objects will also be added.
      • shouldCheckDescriptorForCacheUsage - This setting functions like CheckCacheByPrimaryKey, except checks the appropriate descriptor's shouldDisableCacheHits setting when querying on the cache.

    • setDescriptor

      public void setDescriptor(ClassDescriptor descriptor)
      INTERNAL: Set the descriptor for the query.
      Overrides:
      setDescriptor in class DatabaseQuery

    • setDistinctState

      public void setDistinctState(short distinctState)
      ADVANCED: If a distinct has been set the DISTINCT clause will be printed. This is used internally by TopLink for batch reading but may also be used directly for advanced queries or report queries.

    • setExampleObject

      public void setExampleObject(Object newExampleObject)
      PUBLIC: Set the example object of the query to be the newExampleObject. The example object is used for Query By Example. When doing a Query By Example, an instance of the desired object is created, and the fields are filled with the values that are required in the result set. From these values the corresponding expression is built by EclipseLink, and the query is executed, returning the set of results.

      If a query already has a selection criteria this criteria and the generated query by example criteria will be conjuncted.

      Once a query is executed you must make an explicit call to setExampleObject if the example object is changed, so the query will know to prepare itself again.

      There is a caution to setting both a selection criteria and an example object: Only in this case if you set the example object again after execution you must then also reset the selection criteria. (This is because after execution the original criteria and Query By Example criteria were fused together, and the former cannot be easily recovered from the now invalid result).

      Restrictions:

      • Only attributes whose mappings are DirectToField, Aggregate (Embeddable), ObjectReference (OneToOne) or Collection type OneToMany/ManyToMany are considered in a Query By Example object. The behaviour when an example object has attribute values for other mappings types is undefined.
        • To ensure the example does not include any unsupported mappings the flag QueryByExamplePolicy.setValidateExample(boolean) should be set to true on the corresponding QueryByExamplePolicy to ensure no unsupported relationship types are used in the example.
        • For OneToMany and ManyToMany mappings the elements within the collections and the references attribute values will be added to the expression as disjuncts (OR)

    • setInMemoryQueryIndirectionPolicy

      public void setInMemoryQueryIndirectionPolicy(InMemoryQueryIndirectionPolicy inMemoryQueryIndirectionPolicy)
      PUBLIC: Set the InMemoryQueryIndirectionPolicy for this query.

    • setInMemoryQueryIndirectionPolicyState

      public void setInMemoryQueryIndirectionPolicyState(int inMemoryQueryIndirectionPolicy)
      PUBLIC: Set the InMemoryQueryIndirectionPolicy for this query.

    • setLockMode

      public void setLockMode(short lockMode)
      PUBLIC: Sets whether this is a pessimistically locking query.
      • ObjectBuildingQuery.LOCK: SELECT .... FOR UPDATE issued.
      • ObjectBuildingQuery.LOCK_NOWAIT: SELECT .... FOR UPDATE NO WAIT issued.
      • ObjectBuildingQuery.NO_LOCK: no pessimistic locking.
      • ObjectBuildingQuery.DEFAULT_LOCK_MODE (default) and you have a CMP descriptor: fine grained locking will occur.

      Fine Grained Locking: On execution the reference class and those of all joined attributes will be checked. If any of these have a PessimisticLockingPolicy set on their descriptor, they will be locked in a SELECT ... FOR UPDATE OF ... {NO WAIT}. Issues fewer locks and avoids setting the lock mode on each query.

      Example:readAllQuery.setSelectionCriteria(employee.get("address").equal("Ottawa"));

      • LOCK: all employees in Ottawa and all referenced Ottawa addresses will be locked.
      • DEFAULT_LOCK_MODE: if address is a joined attribute, and only address has a pessimistic locking policy, only referenced Ottawa addresses will be locked.
      Overrides:
      setLockMode in class ObjectBuildingQuery
      See Also:

    • getLockModeType

      public String getLockModeType()
      INTERNAL: returns the jakarta.persistence.LockModeType string value set on this query.

    • setLockModeType

      public boolean setLockModeType(String lockModeType, org.eclipse.persistence.internal.sessions.AbstractSession session)
      INTERNAL: Sets a jakarta.persistence.LockModeType to used with this queries execution. The valid types are: - WRITE - READ - OPTIMISTIC - OPTIMISTIC_FORCE_INCREMENT - PESSIMISTIC_READ - PESSIMISTIC_WRITE - PESSIMISTIC_FORCE_INCREMENT - NONE Setting a null type will do nothing.
      Returns:
      returns a failure flag indicating that we were UNABLE to set the lock mode because of validation. Callers to this method should check the return value and throw the necessary exception.

    • setNonFetchJoinAttributeExpressions

      public void setNonFetchJoinAttributeExpressions(List<Expression> nonFetchJoinExpressions)
      INTERNAL: Return the attributes that must be joined, but not fetched, that is, do not trigger the value holder.

    • setLockingClause

      public void setLockingClause(org.eclipse.persistence.internal.expressions.ForUpdateClause clause)
      INTERNAL: The locking clause contains a list of expressions representing which objects are to be locked by the query.

      Use for even finer grained control over what is and is not locked by a particular query.

    • setPartialAttributeExpressions

      public void setPartialAttributeExpressions(List<Expression> partialAttributeExpressions)
      INTERNAL: Set the partial attributes to select.

    • setEJBQLString

      public void setEJBQLString(String ejbqlString)
      Description copied from class: DatabaseQuery
      PUBLIC: Set the EJBQL string of the query. If arguments are required in the string they will be preceded by "?" then the argument number.
      Overrides:
      setEJBQLString in class DatabaseQuery

    • setQueryByExamplePolicy

      public void setQueryByExamplePolicy(QueryByExamplePolicy queryByExamplePolicy)
      PUBLIC: The QueryByExamplePolicy, is a useful to customize the query when Query By Example is used. The policy will control what attributes should, or should not be included in the query. When dealing with nulls, using special operations (notEqual, lessThan, like, etc.) for comparison, or choosing to include certain attributes at all times, it is useful to modify the policy accordingly.

      Once a query is executed you must make an explicit call to setQueryByExamplePolicy when changing the policy, so the query will know to prepare itself again.

      There is a caution to setting both a selection criteria and an example object: If you set the policy after execution you must also reset the selection criteria. (This is because after execution the original criteria and Query By Example criteria are fused together, and the former cannot be easily recovered).

    • setReferenceClass

      public void setReferenceClass(Class aClass)
      REQUIRED: Set the reference class for the query.
      Overrides:
      setReferenceClass in class ObjectBuildingQuery

    • setReferenceClassName

      public void setReferenceClassName(String aClass)
      INTERNAL: Set the reference class for the query.
      Overrides:
      setReferenceClassName in class ObjectBuildingQuery

    • setSelectionCriteria

      public void setSelectionCriteria(Expression expression)
      PUBLIC: Set the Expression/where clause of the query. The expression should be defined using the query's ExpressionBuilder.
      Overrides:
      setSelectionCriteria in class DatabaseQuery

    • setShouldIncludeData

      public void setShouldIncludeData(boolean shouldIncludeData)
      INTERNAL: Set if the rows for the result of the query should also be returned using a complex query result.
      See Also:

    • shouldCheckCacheOnly

      public boolean shouldCheckCacheOnly()
      PUBLIC: Return if cache should be checked.

    • shouldCheckDescriptorForCacheUsage

      public boolean shouldCheckDescriptorForCacheUsage()
      PUBLIC: Return whether the descriptor's disableCacheHits setting should be checked prior to querying the cache.

    • shouldConformResultsInUnitOfWork

      public boolean shouldConformResultsInUnitOfWork()
      PUBLIC: Should the results will be checked against the changes within the unit of work and object no longer matching or deleted will be remove, matching new objects will also be added..

    • shouldDistinctBeUsed

      public boolean shouldDistinctBeUsed()
      INTERNAL: return true if this query should use a distinct

    • shouldIncludeData

      public boolean shouldIncludeData()
      INTERNAL: Return if the rows for the result of the query should also be returned using a complex query result.
      See Also:

    • shouldOuterJoinSubclasses

      public boolean shouldOuterJoinSubclasses()
      PUBLIC: Return if an outer join should be used to read subclasses. By default a separate query is done for each subclass when querying for a root or branch inheritance class that has subclasses that span multiple tables.

    • setShouldOuterJoinSubclasses

      public void setShouldOuterJoinSubclasses(boolean shouldOuterJoinSubclasses)
      PUBLIC: Set if an outer join should be used to read subclasses. By default a separate query is done for each subclass when querying for a root or branch inheritance class that has subclasses that span multiple tables.

    • shouldReadAllMappings

      public boolean shouldReadAllMappings()
      INTERNAL: Return if this is a full object query, not partial nor fetch group.
      Overrides:
      shouldReadAllMappings in class ObjectBuildingQuery

    • shouldReadMapping

      public boolean shouldReadMapping(DatabaseMapping mapping, FetchGroup fetchGroup)
      INTERNAL: Check if the mapping is part of the partial attributes.
      Overrides:
      shouldReadMapping in class ObjectBuildingQuery

    • useDistinct

      public void useDistinct()
      ADVANCED: If a distinct has been set the DISTINCT clause will be printed. This is used internally by EclipseLink for batch reading but may also be used directly for advanced queries or report queries.

    • isCachedExpressionQuery

      public boolean isCachedExpressionQuery()
      INTERNAL: Indicates whether the query is cached as an expression query in descriptor's query manager.

    • isClonePessimisticLocked

      public boolean isClonePessimisticLocked(Object clone, org.eclipse.persistence.internal.sessions.UnitOfWorkImpl uow)
      INTERNAL: Helper method that checks if clone has been locked with uow.
      Overrides:
      isClonePessimisticLocked in class ObjectBuildingQuery

    • isReferenceClassLocked

      protected boolean isReferenceClassLocked()
      INTERNAL: Cache the locking policy isReferenceClassLocked check.

    • recordCloneForPessimisticLocking

      public void recordCloneForPessimisticLocking(Object clone, org.eclipse.persistence.internal.sessions.UnitOfWorkImpl uow)
      INTERNAL: Helper method that records clone with uow if query is pessimistic locking.
      Overrides:
      recordCloneForPessimisticLocking in class ObjectBuildingQuery

    • isResultSetOptimizedQuery

      public boolean isResultSetOptimizedQuery()
      ADVANCED: Return if the query should be optimized to build directly from the result set. This optimization follows an optimized path and can only be used for, singleton primary key, direct mapped, simple type, no inheritance, uow isolated objects.

    • isResultSetAccessOptimizedQuery

      public Boolean isResultSetAccessOptimizedQuery()
      ADVANCED: Return if the query result set access should be optimized.

    • usesResultSetAccessOptimization

      public boolean usesResultSetAccessOptimization()
      INTERNAL: Return if the query uses ResultSet optimization. Note that to be accurate it's required to be set by prepareResultSetAccessOptimization or checkResultSetAccessOptimization method. It's always returns the same value as this.isResultSetOptimizedQuery.booleanValue (if not null). Note that in this case if optimization is incompatible with other query settings then exception is thrown. Otherwise - if the session demand optimization and it is possible - optimizes (returns true), otherwise false.
      Overrides:
      usesResultSetAccessOptimization in class ObjectBuildingQuery

    • prepareResultSetAccessOptimization

      protected void prepareResultSetAccessOptimization()
      INTERNAL: Sets usesResultSetAccessOptimization based on isResultSetAccessOptimizedQuery, session default and query settings that could not be altered without re-preparing the query. Called when the query is prepared or in case usesResultSetAccessOptimization hasn't been set yet. Throws exception if isResultSetAccessOptimizedQuery==true cannot be accommodated because of a conflict with the query settings. In case of isResultSetAccessOptimizedQuery hasn't been set and session default conflicting with the the query settings the optimization is turned off.

    • clearUsesResultSetAccessOptimization

      public void clearUsesResultSetAccessOptimization()
      INTERNAL:

    • setIsResultSetOptimizedQuery

      public void setIsResultSetOptimizedQuery(boolean isResultSetOptimizedQuery)
      ADVANCED: Set if the query should be optimized to build directly from the result set. This optimization follows an optimized path and can only be used for, singleton primary key, direct mapped, simple type, no inheritance, uow isolated objects.

    • setIsResultSetAccessOptimizedQuery

      public void setIsResultSetAccessOptimizedQuery(boolean isResultSetAccessOptimizedQuery)
      ADVANCED: Set if the query should be optimized to build directly from the result set.

    • clearIsResultSetOptimizedQuery

      public void clearIsResultSetOptimizedQuery()
      ADVANCED: Clear the flag set by setIsResultSetOptimizedQuery method, allow to use default set on the session instead.

    • isDefaultLock

      public boolean isDefaultLock()
      INTERNAL: Helper method to determine the default mode. If true and query has a pessimistic locking policy, locking will be configured according to the pessimistic locking policy.
      Overrides:
      isDefaultLock in class ObjectBuildingQuery

    • isDefaultPropertiesQuery

      public boolean isDefaultPropertiesQuery()
      INTERNAL: Return true if the query uses default properties. This is used to determine if this query is cacheable. i.e. does not use any properties that may conflict with another query with the same JPQL or selection criteria.
      Overrides:
      isDefaultPropertiesQuery in class ReadQuery

    • hasDefaultBuilder

      public boolean hasDefaultBuilder()
      INTERNAL: Checks to see if a builder has been set on the query.

    • hasFetchGroup

      public boolean hasFetchGroup()
      Return if a fetch group is set in the query.

    • getFetchGroup

      public FetchGroup getFetchGroup()
      Return the fetch group set in the query. If a fetch group is not explicitly set in the query, default fetch group optionally defined in the descriptor would be used, unless the user explicitly calls query.setShouldUseDefaultFetchGroup(false). Note that the returned fetchGroup may be updated during preProcess.

    • getLoadGroup

      public LoadGroup getLoadGroup()
      Return the load group set in the query.
      Overrides:
      getLoadGroup in class ObjectBuildingQuery

    • getExecutionFetchGroup

      public FetchGroup getExecutionFetchGroup()
      INTERNAL: Returns FetchGroup that will be applied to the query. Note that the returned fetchGroup may be updated during preProcess.
      Overrides:
      getExecutionFetchGroup in class ObjectBuildingQuery

    • getExecutionFetchGroup

      public FetchGroup getExecutionFetchGroup(ClassDescriptor descriptor)
      INTERNAL: Returns FetchGroup that will be applied to the query. Note that the returned fetchGroup may be updated during preProcess.
      Overrides:
      getExecutionFetchGroup in class ObjectBuildingQuery

    • hasExecutionFetchGroup

      public boolean hasExecutionFetchGroup()
      INTERNAL: Indicates whether a FetchGroup will be applied to the query.
      Overrides:
      hasExecutionFetchGroup in class ObjectBuildingQuery

    • setFetchGroup

      public void setFetchGroup(FetchGroup newFetchGroup)
      Set a dynamic (use case) fetch group to the query.

    • setFetchGroupName

      public void setFetchGroupName(String groupName)
      Set a descriptor-level pre-defined named fetch group to the query.

    • setLoadGroup

      public void setLoadGroup(LoadGroup loadGroup)
      Set a load group to the query.

    • getFetchGroupName

      public String getFetchGroupName()
      Return the fetch group name set in the query.

    • shouldUseDefaultFetchGroup

      public boolean shouldUseDefaultFetchGroup()
      Return false if the query does not use the default fetch group defined in the descriptor level.

    • setShouldUseDefaultFetchGroup

      public void setShouldUseDefaultFetchGroup(boolean shouldUseDefaultFetchGroup)
      Set false if the user does not want to use the default fetch group defined in the descriptor level.

    • getConcreteSubclassCalls

      public Map<Class,org.eclipse.persistence.internal.databaseaccess.DatabaseCall> getConcreteSubclassCalls()
      INTERNAL: Return the cache of concrete subclass calls. This allow concrete subclasses calls to be prepared and cached for inheritance queries.

    • getConcreteSubclassQueries

      public Map<Class,DatabaseQuery> getConcreteSubclassQueries()
      INTERNAL: Return the cache of concrete subclass queries. This allow concrete subclasses calls to be prepared and cached for table per class inheritance and interface queries.

    • getAggregateQueries

      public Map<DatabaseMapping,ObjectLevelReadQuery> getAggregateQueries()
      INTERNAL: Return the cache of aggregate queries. This allows aggregate query clones to be cached.

    • getAggregateQuery

      public ObjectLevelReadQuery getAggregateQuery(DatabaseMapping mapping)
      INTERNAL: Return the aggregate query clone for the mapping.

    • setAggregateQuery

      public void setAggregateQuery(DatabaseMapping mapping, ObjectLevelReadQuery query)
      INTERNAL: Set the aggregate query clone for the mapping.

    • getConcreteSubclassJoinedMappingIndexes

      public Map<Class,Map<DatabaseMapping,Object>> getConcreteSubclassJoinedMappingIndexes()
      INTERNAL: Return the cache of concrete subclass joined mapping indexes. This allow concrete subclasses calls to be prepared and cached for inheritance queries.

    • isPrimaryKeyQuery

      public boolean isPrimaryKeyQuery()
      INTERNAL: Return if the query is known to be by primary key.

    • extendPessimisticLockScope

      public void extendPessimisticLockScope()
      INTERNAL: Extends pessimistic lock scope.

    • getBatchFetchPolicy

      public BatchFetchPolicy getBatchFetchPolicy()
      Return the batch fetch policy for configuring batch fetching.

    • setBatchFetchPolicy

      public void setBatchFetchPolicy(BatchFetchPolicy batchFetchPolicy)
      Set the batch fetch policy for configuring batch fetching.

    • getBatchReadAttributeExpressions

      public List<Expression> getBatchReadAttributeExpressions()
      INTERNAL: Return all attributes specified for batch reading.

    • setBatchReadAttributeExpressions

      public void setBatchReadAttributeExpressions(List<Expression> attributeExpressions)
      INTERNAL: Set all attributes specified for batch reading.

    • hasBatchReadAttributes

      public boolean hasBatchReadAttributes()
      INTERNAL: Return true is this query has batching

    • isAttributeBatchRead

      public boolean isAttributeBatchRead(ClassDescriptor mappingDescriptor, String attributeName)
      INTERNAL: Return if the attribute is specified for batch reading.

    • computeBatchReadMappingQueries

      public void computeBatchReadMappingQueries()
      INTERNAL: Used to optimize joining by pre-computing the nested join queries for the mappings.

    • computeBatchReadAttributes

      public void computeBatchReadAttributes()
      INTERNAL: Compute the cache batched attributes. Used to recompute batched attributes for nested aggregate queries.

    • computeNestedQueriesForBatchReadExpressions

      protected void computeNestedQueriesForBatchReadExpressions(List<Expression> batchReadExpressions)
      INTERNAL: This method is used when computing the nested queries for batch read mappings. It recurses computing the nested mapping queries.

    • addBatchReadAttribute

      public void addBatchReadAttribute(String attributeName)
      PUBLIC: Specify the foreign-reference mapped attribute to be optimized in this query. The query will execute normally, however when any of the batched parts is accessed, the parts will all be read in a single query, this allows all of the data required for the parts to be read in a single query instead of (n) queries. This should be used when the application knows that it requires the part for all of the objects being read. This can be used for one-to-one, one-to-many, many-to-many and direct collection mappings. The use of the expression allows for nested batch reading to be expressed.

      Example: query.addBatchReadAttribute("phoneNumbers")

      See Also:

    • addBatchReadAttribute

      public void addBatchReadAttribute(Expression attributeExpression)
      PUBLIC: Specify the foreign-reference mapped attribute to be optimized in this query. The query will execute normally, however when any of the batched parts is accessed, the parts will all be read in a single query, this allows all of the data required for the parts to be read in a single query instead of (n) queries. This should be used when the application knows that it requires the part for all of the objects being read. This can be used for one-to-one, one-to-many, many-to-many and direct collection mappings. The use of the expression allows for nested batch reading to be expressed.

      Example: query.addBatchReadAttribute(query.getExpressionBuilder().get("policies").get("claims"))

      See Also:

    • setBatchFetchType

      public void setBatchFetchType(BatchFetchType type)
      PUBLIC: Set the batch fetch type for the query. This can be JOIN, EXISTS, or IN. This defines the type of batch reading to use with the query. The query must have defined batch read attributes to set its fetch type.
      See Also:

    • setBatchFetchSize

      public void setBatchFetchSize(int size)
      PUBLIC: Set the batch fetch size for the query. This is only relevant for the IN batch fetch type. This defines the max number of keys for the IN clause.
      See Also:

    • getBatchObjects

      public Map<Object,Object> getBatchObjects()
      INTERNAL: Return temporary map of batched objects.
      Overrides:
      getBatchObjects in class DatabaseQuery

    • setBatchObjects

      public void setBatchObjects(Map<Object,Object> batchObjects)
      INTERNAL: Set temporary map of batched objects.
      Overrides:
      setBatchObjects in class DatabaseQuery

    • toString

      public String toString()
      Overrides:
      toString in class DatabaseQuery

    • supportsResultSetAccessOptimizationOnPrepare

      public boolean supportsResultSetAccessOptimizationOnPrepare()
      INTERNAL: Indicates whether the query can use ResultSet optimization. The method is called when the query is prepared, so it should refer only to the attributes that cannot be altered without re-preparing the query. If the query is a clone and the original has been already prepared this method will be called to set a (transient and therefore set to null) usesResultSetAccessOptimization attribute.

    • supportsResultSetAccessOptimizationOnExecute

      public boolean supportsResultSetAccessOptimizationOnExecute()
      INTERNAL: Indicates whether the query can use ResultSet optimization. Note that the session must be already set. The method is called when the query is executed, so it should refer only to the attributes that can be altered without re-preparing the query.

    • shouldUseSerializedObjectPolicy

      public boolean shouldUseSerializedObjectPolicy()
      INTERNAL: Indicates whether the query should use SerializedObjectPolicy if descriptor has it.
      Overrides:
      shouldUseSerializedObjectPolicy in class ObjectBuildingQuery

    • setShouldUseSerializedObjectPolicy

      public void setShouldUseSerializedObjectPolicy(boolean shouldUseSerializedObjectPolicy)
      INTERNAL: Set a flag that indicates whether the query should use SerializedObjectPolicy if descriptor has it.