org.eclipse.persistence.queries
Class DeleteAllQuery

java.lang.Object
  org.eclipse.persistence.queries.DatabaseQuery
      org.eclipse.persistence.queries.ModifyQuery
          org.eclipse.persistence.queries.ModifyAllQuery
              org.eclipse.persistence.queries.DeleteAllQuery

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class DeleteAllQuery
extends ModifyAllQuery

Purpose: Query used to delete a collection of objects. This is used by mappings to delete all of their target objects in a single database call. The SQL/SQLStatements must be provided.

DeleteAll can also be used with an Expression (or JPQL) to dynamically delete a set of objects from the database, and invalidate them in the cache.

Responsibilities:

• Stores & retrieves the objects to delete.
• Store the where clause used for the deletion.

See Also:

Serialized Form

Author:

Yvon Lavoie

Since:

TOPLink/Java 1.0

Field Summary

protected boolean	isInMemoryOnly Defines if objects should be remove from the persistence context only (no database).
protected java.util.List<java.lang.Object>	objects List containing objects to be deleted, these should be removed from the identity map after deletion.

Fields inherited from class org.eclipse.persistence.queries.ModifyAllQuery

defaultBuilder, INVALIDATE_CACHE, isPreparedUsingTempStorage, NO_CACHE, referenceClass, referenceClassName, result

Fields inherited from class org.eclipse.persistence.queries.ModifyQuery

forceBatchStatementExecution, modifyRow

Fields inherited from class org.eclipse.persistence.queries.DatabaseQuery

accessors, argumentFields, arguments, argumentTypeNames, argumentTypes, argumentValues, BATCH_FETCH_PROPERTY, CascadeAggregateDelete, CascadeAllParts, CascadeByMapping, CascadeDependentParts, cascadePolicy, CascadePrivateParts, descriptor, doNotRedirect, executionSession, flushOnExecute, hintString, isCustomQueryUsed, isExecutionClone, isNativeConnectionRequired, isPrepared, isUserDefined, monitorName, name, NoCascading, parameterDelimiter, partitioningPolicy, properties, queryMechanism, queryTimeout, redirector, session, sessionName, shouldBindAllParameters, shouldCacheStatement, shouldCloneCall, shouldMaintainCache, shouldPrepare, shouldRetrieveBypassCache, shouldStoreBypassCache, shouldUseWrapperPolicy, shouldValidateUpdateCallCacheUse, sourceMapping, translationRow

Constructor Summary

DeleteAllQuery()
PUBLIC:

DeleteAllQuery(java.lang.Class referenceClass)
PUBLIC: Create a new delete all query for the class specified.

DeleteAllQuery(java.lang.Class referenceClass, Expression selectionCriteria)
PUBLIC: Create a new delete all query for the class and the selection criteria specified.

Method Summary

java.lang.Object	executeDatabaseQuery() INTERNAL: Perform the work to delete a collection of objects.
void	executeDeleteAll(org.eclipse.persistence.internal.sessions.AbstractSession session, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow, java.util.Vector objects) INTERNAL: Delete all queries are executed specially to avoid cloning and ensure preparing.
java.lang.Object	executeInUnitOfWork(org.eclipse.persistence.internal.sessions.UnitOfWorkImpl unitOfWork, org.eclipse.persistence.internal.sessions.AbstractRecord translationRow) INTERNAL: This method has to be broken.
protected QueryRedirector	getDefaultRedirector() INTERNAL: Returns the specific default redirector for this query type.
java.util.List<java.lang.Object>	getObjects() PUBLIC: Return the objects that are to be deleted
boolean	isDeleteAllQuery() PUBLIC: Return if this is a delete all query.
boolean	isInMemoryOnly() INTERNAL: Return if objects should be remove from the persistence context only (no database).
protected void	prepare() INTERNAL: Prepare the receiver for execution in a session.
void	setIsInMemoryOnly(boolean isInMemoryOnly) INTERNAL: Set if objects should be remove from the persistence context only (no database).
void	setObjects(java.util.List<java.lang.Object> objectCollection) PUBLIC (REQUIRED): Set the objects to be deleted.

Methods inherited from class org.eclipse.persistence.queries.ModifyAllQuery

clonedQueryExecutionComplete, getCacheUsage, getExpressionBuilder, getReferenceClass, getReferenceClassName, initializeDefaultBuilder, initializeQuerySpecificDefaultBuilder, invalidateCache, isModifyQuery, isPreparedUsingTempStorage, mergeChangesIntoSharedCache, setCacheUsage, setExpressionBuilder, setIsPreparedUsingTempStorage, setReferenceClass, setReferenceClassName, setShouldDeferExecutionInUOW, shouldDeferExecutionInUOW, shouldInvalidateCache

Methods inherited from class org.eclipse.persistence.queries.ModifyQuery

forceBatchStatementExecution, getModifyRow, setForceBatchStatementExecution, setModifyRow

Methods inherited from class org.eclipse.persistence.queries.DatabaseQuery

addArgument, addArgument, addArgument, addArgumentByTypeName, addArgumentValue, addArgumentValues, addCall, addStatement, bindAllParameters, buildArgumentFields, buildSelectionCriteria, cacheStatement, cascadeAllParts, cascadeByMapping, cascadeOnlyDependentParts, cascadePrivateParts, checkDescriptor, checkEarlyReturn, checkForCustomQuery, checkPrepare, checkPrepare, clone, convertClassNamesToClasses, copyFromQuery, dontBindAllParameters, dontCacheStatement, dontCascadeParts, dontMaintainCache, execute, extractRemoteResult, getAccessor, getAccessors, getArguments, getArgumentTypeNames, getArgumentTypes, getArgumentValues, getBatchObjects, getCall, getCascadePolicy, getDatasourceCall, getDatasourceCalls, getDescriptor, getDoNotRedirect, getEJBQLString, getExecutionSession, getFlushOnExecute, getHintString, getJPQLString, getMonitorName, getName, getParameterDelimiter, getParameterDelimiterChar, getPartitioningPolicy, getProperties, getProperty, getQueryMechanism, getQueryTimeout, getRedirector, getSelectionCriteria, getSession, getSessionName, getShouldBindAllParameters, getSourceMapping, getSQLStatement, getSQLString, getSQLStrings, getTranslatedSQLString, getTranslatedSQLStrings, getTranslationRow, hasAccessor, hasArguments, hasProperties, hasQueryMechanism, hasSessionName, ignoreBindAllParameters, ignoreCacheStatement, isCallQuery, isCascadeOfAggregateDelete, isCustomQueryUsed, isCustomSelectionQuery, isDataModifyQuery, isDataReadQuery, isDefaultPropertiesQuery, isDeleteObjectQuery, isDirectReadQuery, isExecutionClone, isExpressionQuery, isInsertObjectQuery, isJPQLCallQuery, isModifyAllQuery, isNativeConnectionRequired, isObjectBuildingQuery, isObjectLevelModifyQuery, isObjectLevelReadQuery, isPrepared, isReadAllQuery, isReadObjectQuery, isReadQuery, isReportQuery, isSQLCallQuery, isUpdateAllQuery, isUpdateObjectQuery, isUserDefined, isValueReadQuery, isWriteObjectQuery, maintainCache, prepareCall, prepareCustomQuery, prepareForExecution, prepareForRemoteExecution, prepareFromQuery, redirectQuery, remoteExecute, remoteExecute, removeProperty, replaceValueHoldersIn, resetMonitorName, retrieveBypassCache, rowFromArguments, setAccessor, setAccessors, setArguments, setArgumentTypeNames, setArgumentTypes, setArgumentValues, setBatchObjects, setCall, setCascadePolicy, setDatasourceCall, setDescriptor, setDoNotRedirect, setEJBQLString, setExecutionSession, setFlushOnExecute, setHintString, setIsCustomQueryUsed, setIsExecutionClone, setIsNativeConnectionRequired, setIsPrepared, setIsUserDefined, setJPQLString, setName, setParameterDelimiter, setPartitioningPolicy, setProperties, setProperty, setQueryMechanism, setQueryTimeout, setRedirector, setSelectionCriteria, setSession, setSessionName, setShouldBindAllParameters, setShouldBindAllParameters, setShouldCacheStatement, setShouldMaintainCache, setShouldPrepare, setShouldRetrieveBypassCache, setShouldStoreBypassCache, setShouldUseWrapperPolicy, setShouldValidateUpdateCallCacheUse, setSourceMapping, setSQLStatement, setSQLString, setTranslationRow, shouldBindAllParameters, shouldCacheStatement, shouldCascadeAllParts, shouldCascadeByMapping, shouldCascadeOnlyDependentParts, shouldCascadeParts, shouldCascadePrivateParts, shouldCloneCall, shouldIgnoreBindAllParameters, shouldIgnoreCacheStatement, shouldMaintainCache, shouldPrepare, shouldRetrieveBypassCache, shouldStoreBypassCache, shouldUseWrapperPolicy, shouldValidateUpdateCallCacheUse, storeBypassCache, toString

Methods inherited from class java.lang.Object

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

Field Detail

objects

protected java.util.List<java.lang.Object> objects

List containing objects to be deleted, these should be removed from the identity map after deletion.

isInMemoryOnly

protected boolean isInMemoryOnly

Defines if objects should be remove from the persistence context only (no database). This is used if delete was already cascaded by the database.

Constructor Detail

DeleteAllQuery

public DeleteAllQuery()

PUBLIC:

DeleteAllQuery

public DeleteAllQuery(java.lang.Class referenceClass)

PUBLIC: Create a new delete all query for the class specified.

DeleteAllQuery

public DeleteAllQuery(java.lang.Class referenceClass,
                      Expression selectionCriteria)

PUBLIC: Create a new delete all query for the class and the selection criteria specified.

Method Detail

isInMemoryOnly

public boolean isInMemoryOnly()

INTERNAL: Return if objects should be remove from the persistence context only (no database). This is used if delete was already cascaded by the database.

setIsInMemoryOnly

public void setIsInMemoryOnly(boolean isInMemoryOnly)

INTERNAL: Set if objects should be remove from the persistence context only (no database). This is used if delete was already cascaded by the database.

isDeleteAllQuery

public boolean isDeleteAllQuery()

PUBLIC: Return if this is a delete all query.

Overrides:

isDeleteAllQuery in class DatabaseQuery

executeInUnitOfWork

public java.lang.Object executeInUnitOfWork(org.eclipse.persistence.internal.sessions.UnitOfWorkImpl unitOfWork,
                                            org.eclipse.persistence.internal.sessions.AbstractRecord translationRow)
                                     throws DatabaseException

INTERNAL: This method has to be broken. If commit manager is not active either an exception should be thrown (ObjectLevelModify case), or a transaction should be started early and execute on parent if remote (dataModify case). A modify query is NEVER executed on the parent, unless remote session.

Overrides:

executeInUnitOfWork in class ModifyAllQuery

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.

executeDatabaseQuery

public java.lang.Object executeDatabaseQuery()
                                      throws DatabaseException

INTERNAL: Perform the work to delete a collection of objects. This skips the optimistic lock check and should not called for objects using locking.

Specified by:

executeDatabaseQuery in class DatabaseQuery

Returns:

Integer the number of objects (rows) deleted.

Throws:

DatabaseException - - an error has occurred on the database.

executeDeleteAll

public void executeDeleteAll(org.eclipse.persistence.internal.sessions.AbstractSession session,
                             org.eclipse.persistence.internal.sessions.AbstractRecord translationRow,
                             java.util.Vector objects)
                      throws DatabaseException

INTERNAL: Delete all queries are executed specially to avoid cloning and ensure preparing.

Throws:

DatabaseException

getDefaultRedirector

protected QueryRedirector getDefaultRedirector()

INTERNAL: Returns the specific default redirector for this query type. There are numerous default query redirectors. See ClassDescriptor for their types.

Overrides:

getDefaultRedirector in class DatabaseQuery

getObjects

public java.util.List<java.lang.Object> getObjects()

PUBLIC: Return the objects that are to be deleted

prepare

protected void prepare()
                throws QueryException

INTERNAL: Prepare the receiver for execution in a session.

Overrides:

prepare in class DatabaseQuery

Throws:

QueryException

setObjects

public void setObjects(java.util.List<java.lang.Object> objectCollection)

PUBLIC (REQUIRED): Set the objects to be deleted. Also REQUIRED is a selection criteria or SQL string that performs the deletion of the objects. This does not generate the SQL call from the deleted objects.

List objects used as an indicator of one of two possible ways the query may behave:

objects != null - the "old" functionality used by OneToMany mapping objects deleted from the cache, either selection expression or custom sql should be provided for deletion from db;

objects == null - the "new" functionality (on par with UpdateAllQuery) the cache is either left alone or in-memory query finds the cached objects to be deleted, and these objects are invalidated in cache.

Note that empty objects is still objects != case. Signal that no cache altering is required. Used by AggregationCollectionMapping and OneToManyMapping in case they use indirection and the ValueHolder has not been instantiated.