oracle.toplink.essentials.queryframework

Class UpdateAllQuery

java.lang.Object

oracle.toplink.essentials.queryframework.DatabaseQuery

oracle.toplink.essentials.queryframework.ModifyQuery

oracle.toplink.essentials.queryframework.ModifyAllQuery

oracle.toplink.essentials.queryframework.UpdateAllQuery

All Implemented Interfaces:

Serializable, Cloneable, FalseUndefinedTrue

public class UpdateAllQuery
extends ModifyAllQuery

PUBLIC: A Query Class used to perform a bulk update using TopLink's expression framework. This class is provided to help optimize performance. It can be used in place of reading in all the objects to be changed and issuing single updates per instance. With this approach a single SQL UPDATE statement can be issued and then, based on the Expression provided, any objects in the cache that are effected by the update can be invalidated.

Notes:

• By default, if a UOW is being used, this query will be deferred until the UOW commits.
• UpdateAllQuery does not support foreign key updates unless the relationship is 1-1 (without back pointers.)

Example of Usage: Adding an area code.
UpdateAllQuery updateQuery = new UpdateAllQuery(Employee.class);
updateQuery.setSelectionCriteria(eb.get("areaCode").isNull());
updateQuery.addUpdate(eb.get("areaCode"), "613");


Author:

Guy Pelletier

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected HashMap	m_updateClauses

Fields inherited from class oracle.toplink.essentials.queryframework.ModifyAllQuery

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

Fields inherited from class oracle.toplink.essentials.queryframework.ModifyQuery

forceBatchStatementExecution, modifyRow

Fields inherited from class oracle.toplink.essentials.queryframework.DatabaseQuery

accessor, arguments, argumentTypeNames, argumentTypes, argumentValues, CascadeAggregateDelete, CascadeAllParts, CascadeByMapping, CascadeDependentParts, cascadePolicy, CascadePrivateParts, descriptor, flushOnExecute, isPrepared, isUserDefined, name, NoCascading, properties, queryMechanism, session, sessionName, shouldBindAllParameters, shouldCacheStatement, shouldCloneCall, shouldMaintainCache, shouldPrepare, shouldUseWrapperPolicy, translationRow

Fields inherited from interface oracle.toplink.essentials.internal.helper.FalseUndefinedTrue

False, True, Undefined

Constructor Summary

Constructors

Constructor and Description
UpdateAllQuery() PUBLIC: Constructs a default update all query.
UpdateAllQuery(Class referenceClass) PUBLIC: Constructs an update all query for the Class type specified.
UpdateAllQuery(Class referenceClass, Expression selectionCriteria) PUBLIC: Constructs an update all query for the specified Class type and selection criteria.
UpdateAllQuery(Class referenceClass, ExpressionBuilder expressionBuilder) PUBLIC: Constructs an update all query for the Class type specified and the given ExpressionBuilder.

Method Summary

Modifier and Type	Method and Description
void	addUpdate(Expression field, Expression value) PUBLIC: Adds the update (SET) clause to the query.
void	addUpdate(Expression field, Object value) PUBLIC: Adds the update (SET) clause to the query.
void	addUpdate(String attributeName, Expression value) PUBLIC: Adds the update (SET) clause to the query.
void	addUpdate(String attributeName, Object value) PUBLIC: Adds the update (SET) clause to the query.
protected void	addUpdateInternal(Object fieldObject, Object valueObject) INTERNAL:
Object	executeDatabaseQuery() INTERNAL: Issue the SQL to the database and then merge into the cache.
HashMap	getUpdateClauses() INTERNAL: Return the updates stored for an update all query
protected void	initializeQuerySpecificDefaultBuilder() INTERNAL: Initialize the expression builder which should be used for this query.
boolean	isUpdateAllQuery() INTERNAL: Return true if this is an update all query.
protected void	prepare() INTERNAL:

Methods inherited from class oracle.toplink.essentials.queryframework.ModifyAllQuery

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

Methods inherited from class oracle.toplink.essentials.queryframework.ModifyQuery

forceBatchStatementExecution, getModifyRow, setForceBatchStatementExecution, setModifyRow

Methods inherited from class oracle.toplink.essentials.queryframework.DatabaseQuery

addArgument, addArgument, addArgument, addArgumentByTypeName, addArgumentValue, addArgumentValues, addCall, addStatement, bindAllParameters, buildSelectionCriteria, cacheStatement, cascadeAllParts, cascadeByMapping, cascadeOnlyDependentParts, cascadePrivateParts, checkDescriptor, checkEarlyReturn, checkForCustomQuery, checkPrepare, clone, convertClassNamesToClasses, deploymentSetShouldMaintainCache, deploymentShouldMaintainCache, dontBindAllParameters, dontCacheStatement, dontCascadeParts, dontMaintainCache, execute, getAccessor, getArguments, getArgumentTypeNames, getArgumentTypes, getArgumentValues, getCall, getCascadePolicy, getDatasourceCall, getDatasourceCalls, getDescriptor, getEJBQLString, getFlushOnExecute, getName, getProperties, getProperty, getQueryMechanism, getSelectionCriteria, getSession, getSessionName, getShouldBindAllParameters, getSQLStatement, getSQLString, getSQLStrings, getTranslatedSQLString, getTranslatedSQLStrings, getTranslationRow, hasAccessor, hasProperties, hasQueryMechanism, hasSessionName, ignoreBindAllParameters, ignoreCacheStatement, isCallQuery, isCascadeOfAggregateDelete, isDataModifyQuery, isDataReadQuery, isDeleteAllQuery, isDeleteObjectQuery, isExpressionQuery, isInsertObjectQuery, isModifyAllQuery, isObjectBuildingQuery, isObjectLevelModifyQuery, isObjectLevelReadQuery, isPrepared, isReadAllQuery, isReadObjectQuery, isReadQuery, isReportQuery, isSQLCallQuery, isUpdateObjectQuery, isUserDefined, isWriteObjectQuery, maintainCache, prepareCall, prepareCustomQuery, prepareForExecution, prepareForRemoteExecution, removeProperty, rowFromArguments, setAccessor, setArguments, setArgumentTypeNames, setArgumentTypes, setArgumentValues, setCall, setCascadePolicy, setDatasourceCall, setDescriptor, setEJBQLString, setFlushOnExecute, setIsPrepared, setIsUserDefined, setName, setProperties, setProperty, setQueryMechanism, setSelectionCriteria, setSession, setSessionName, setShouldBindAllParameters, setShouldBindAllParameters, setShouldCacheStatement, setShouldMaintainCache, setShouldPrepare, setShouldUseWrapperPolicy, setSQLStatement, setSQLString, setTranslationRow, shouldBindAllParameters, shouldCacheStatement, shouldCascadeAllParts, shouldCascadeByMapping, shouldCascadeOnlyDependentParts, shouldCascadeParts, shouldCascadePrivateParts, shouldCloneCall, shouldIgnoreBindAllParameters, shouldIgnoreCacheStatement, shouldMaintainCache, shouldPrepare, shouldUseWrapperPolicy, toString

Methods inherited from class java.lang.Object

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

Field Detail

m_updateClauses

protected HashMap m_updateClauses

Constructor Detail

UpdateAllQuery

public UpdateAllQuery()

PUBLIC: Constructs a default update all query.

UpdateAllQuery

public UpdateAllQuery(Class referenceClass)

PUBLIC: Constructs an update all query for the Class type specified.

Parameters:

referenceClass - Class

UpdateAllQuery

public UpdateAllQuery(Class referenceClass,
                      Expression selectionCriteria)

PUBLIC: Constructs an update all query for the specified Class type and selection criteria.

Parameters:

referenceClass - Class type to be considered

selectionCriteria - Expression

UpdateAllQuery

public UpdateAllQuery(Class referenceClass,
                      ExpressionBuilder expressionBuilder)

PUBLIC: Constructs an update all query for the Class type specified and the given ExpressionBuilder. This sets the default builder which is used for all associated expressions in the query.

Parameters:

referenceClass - Class type to be considered

builder - ExpressionBuilder

Method Detail

addUpdate

public void addUpdate(Expression field,
                      Object value)

PUBLIC: Adds the update (SET) clause to the query. Uses default ExpressionBuilder.

Parameters:

field - Expression Object level representation of a database query 'where' clause

value - Object, the new value

addUpdate

public void addUpdate(String attributeName,
                      Object value)

PUBLIC: Adds the update (SET) clause to the query. Uses default ExpressionBuilder.

Parameters:

attributeName - String, the name of the attribute

value - Object, the new value

addUpdate

public void addUpdate(Expression field,
                      Expression value)

PUBLIC: Adds the update (SET) clause to the query. This method ensures that the builder has the session and reference class set for both given Expressions. Uses default ExpressionBuilder.

Parameters:

field - Expression, representation of a database query 'where' clause that describes the field

value - Expression, representation of a database query 'where' clause that describes the new value

addUpdate

public void addUpdate(String attributeName,
                      Expression value)

PUBLIC: Adds the update (SET) clause to the query. Uses default ExpressionBuilder.

Parameters:

attributeName - String, the name of the attribute

value - Expression, the new value

addUpdateInternal

protected void addUpdateInternal(Object fieldObject,
                                 Object valueObject)

INTERNAL:

executeDatabaseQuery

public Object executeDatabaseQuery()
                            throws DatabaseException

INTERNAL: Issue the SQL to the database and then merge into the cache. If we are within a UoW, the merge to the cache must not be done until the UoW merges into the parent. The UoW will trigger the merge to occur at the correct time and will ensure the cache setting is set to none at that time.

Specified by:

executeDatabaseQuery in class DatabaseQuery

Returns:

- the result of executing the query.

Throws:

DatabaseException - - an error has occurred on the database.

getUpdateClauses

public HashMap getUpdateClauses()

INTERNAL: Return the updates stored for an update all query

isUpdateAllQuery

public boolean isUpdateAllQuery()

INTERNAL: Return true if this is an update all query.

Overrides:

isUpdateAllQuery in class DatabaseQuery

prepare

protected void prepare()
                throws QueryException

INTERNAL:

Overrides:

prepare in class DatabaseQuery

Throws:

QueryException

initializeQuerySpecificDefaultBuilder

protected void initializeQuerySpecificDefaultBuilder()

INTERNAL: Initialize the expression builder which should be used for this query. If there is a where clause, use its expression builder. If after this method defaultBuilder is still null, then initializeDefaultBuilder method will generate and cache it.

Overrides:

initializeQuerySpecificDefaultBuilder in class ModifyAllQuery