Module org.eclipse.persistence.core

Package org.eclipse.persistence.mappings.structures

Class NestedTableMapping

java.lang.Object

org.eclipse.persistence.core.mappings.CoreMapping<AttributeAccessor,AbstractSession,ContainerPolicy,ClassDescriptor,DatabaseField>

org.eclipse.persistence.mappings.DatabaseMapping

org.eclipse.persistence.mappings.ForeignReferenceMapping

org.eclipse.persistence.mappings.CollectionMapping

org.eclipse.persistence.mappings.structures.NestedTableMapping

All Implemented Interfaces:

Serializable, Cloneable, ContainerMapping

public class NestedTableMapping
extends CollectionMapping

Purpose: Nested tables are similar to VARRAYs except internally they store their information in a separate table from their parent structure's table. The advantage of nested tables is that they support querying and joining much better than varrays that are inlined into the parent table. A nested table is typically used to represent a one-to-many or many-to-many relationship of references to another independent structure. TopLink supports storing a nested table of values into a single field.

NOTE: Only Oracle8i supports nested tables type.

Since:

TOPLink/Java 2.5

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.eclipse.persistence.mappings.DatabaseMapping

DatabaseMapping.WriteType

Field Summary

Fields

Modifier and Type	Field	Description
protected DatabaseField	field	A ref is always stored in a single field.
protected DatabaseMapping	nestedMapping
protected String	structureName	Arrays require a structure name, this is the ADT defined for the VARRAY.

Fields inherited from class org.eclipse.persistence.mappings.CollectionMapping

changeOrderTargetQuery, containerPolicy, deleteAllQuery, hasCustomDeleteAllQuery, hasOrderBy, isListOrderFieldSupported, isSynchronizeOnMerge, listOrderField, mustDeleteReferenceObjectsOneByOne, orderCorrectionType

Fields inherited from class org.eclipse.persistence.mappings.ForeignReferenceMapping

batchFetchType, cascadeDetach, cascadeMerge, cascadePersist, cascadeRefresh, cascadeRemove, forceInitializationOfSelectionCriteria, hasCustomSelectionQuery, indirectionPolicy, INNER_JOIN, isCascadeOnDeleteSetOnDatabase, isPrivateOwned, joinFetch, mappedBy, NONE, OUTER_JOIN, partitioningPolicy, partitioningPolicyName, QUERY_BATCH_PARAMETER, referenceClass, referenceClassName, referenceDescriptor, relationshipPartner, relationshipPartnerAttributeName, requiresTransientWeavedFields, selectionQuery, tempInitSession

Fields inherited from class org.eclipse.persistence.mappings.DatabaseMapping

attributeAccessor, attributeName, derivedIdMapping, derivesId, descriptor, fields, isCacheable, isInSopObject, isJPAId, isLazy, isMapKeyMapping, isOptional, isPrimaryKeyMapping, isReadOnly, isRemotelyInitialized, mapsIdValue, NO_FIELDS, NO_WEIGHT, properties, unconvertedProperties, weight, WEIGHT_AGGREGATE, WEIGHT_DIRECT, WEIGHT_TO_ONE, WEIGHT_TRANSFORM

Constructor Summary

Constructors

Constructor	Description
NestedTableMapping()	PUBLIC: Default constructor.

Method Summary

Modifier and Type	Method	Description
Expression	buildExpression(Object queryObject, QueryByExamplePolicy policy, Expression expressionBuilder, Map processedObjects, AbstractSession session)	INTERNAL: In case Query By Example is used, this method builds and returns an expression that corresponds to a single attribute and it's value.
Object	clone()	INTERNAL: The mapping clones itself to create deep copy
protected Vector	collectFields()	Returns all the aggregate fields.
DatabaseField	getField()	INTERNAL: Returns the field which this mapping represents.
String	getFieldName()	PUBLIC: Return the name of the field this mapping represents.
Expression	getJoinCriteria(ObjectExpression context, Expression base)	INTERNAL: Join criteria is created to read target records (nested table) from the table.
String	getStructureName()	PUBLIC: Return the structure name of the nestedTable.
boolean	hasConstraintDependency()	INTERNAL: The returns if the mapping has any constraint dependencies, such as foreign keys and join tables.
void	initialize(AbstractSession session)	INTERNAL: Initialize the mapping.
protected void	initializeSelectionCriteria(AbstractSession session)	INTERNAL: Selection criteria is created to read target records (nested table) from the table.
boolean	isNestedTableMapping()	INTERNAL:
void	postInitialize(AbstractSession session)	INTERNAL: Post Initialize the mapping.
void	preDelete(DeleteObjectQuery query)	INTERNAL: Delete privately owned parts
void	preInsert(WriteObjectQuery query)	INTERNAL: Insert privately owned parts
void	preUpdate(WriteObjectQuery query)	INTERNAL: Update the privately owned parts
protected void	setField(DatabaseField theField)	Set the field in the mapping.
void	setFieldName(String FieldName)	PUBLIC: Set the field name in the mapping.
void	setStructureName(String structureName)	PUBLIC: Set the name of the structure.
protected void	verifyDeleteForUpdate(DeleteObjectQuery query)	INTERNAL: Verifying deletes make sure that all the records privately owned by this mapping are actually removed.
void	writeFromObjectIntoRow(Object object, AbstractRecord record, AbstractSession session, DatabaseMapping.WriteType writeType)	INTERNAL: Get a value from the object and set that in the respective field of the row.
void	writeFromObjectIntoRowForShallowInsert(Object object, AbstractRecord record, AbstractSession session)	INTERNAL: This row is built for shallow insert which happens in case of bidirectional inserts.
void	writeFromObjectIntoRowForShallowInsertWithChangeRecord(ChangeRecord changeRecord, AbstractRecord record, AbstractSession session)	INTERNAL: This row is built for shallow insert which happens in case of bidirectional inserts.
void	writeFromObjectIntoRowForUpdate(WriteObjectQuery writeQuery, AbstractRecord record)	INTERNAL: Write the entire structure into the row as a special type that prints as the constructor.
void	writeFromObjectIntoRowForUpdateAfterShallowInsert(Object object, AbstractRecord record, AbstractSession session, DatabaseTable table)	INTERNAL: This row is built for update after shallow insert which happens in case of bidirectional inserts.
void	writeFromObjectIntoRowWithChangeRecord(ChangeRecord changeRecord, AbstractRecord record, AbstractSession session, DatabaseMapping.WriteType writeType)	INTERNAL: Get a value from the object and set that in the respective field of the row.
void	writeInsertFieldsIntoRow(AbstractRecord record, AbstractSession session)	INTERNAL: Write fields needed for insert into the template for with null values.

Methods inherited from class org.eclipse.persistence.mappings.CollectionMapping

addAggregateOrderBy, addAscendingOrdering, addDescendingOrdering, addOrderBy, buildBackupCloneForPartObject, buildChangeRecord, buildCloneForPartObject, buildContainerClone, buildCopy, buildElementClone, buildElementUnitOfWorkClone, buildListOrderField, buildReferencesPKList, calculateDeferredChanges, cascadeDiscoverAndPersistUnregisteredNewObjects, cascadePerformRemoveIfRequired, cascadePerformRemovePrivateOwnedObjectFromChangeSetIfRequired, cascadeRegisterNewIfRequired, collectQueryParameters, compareCollectionsForChange, compareForChange, compareLists, compareListsAndWrite, compareObjects, compareObjectsAndWrite, compareObjectsWithoutPrivateOwned, compareObjectsWithPrivateOwned, convertClassNamesToClasses, copyElement, executeBatchQuery, extractKeyFromTargetRow, extractResultFromBatchQuery, fixRealObjectReferences, getAdditionalFieldsBaseExpression, getContainerPolicy, getDeleteAllQuery, getListOrderField, getObjectCorrespondingTo, getOrderByQueryKeyExpressions, getOrderCorrectionType, getRealCollectionAttributeValueFromObject, getSelectionQueryContainerPolicy, getTargetPrimaryKeyFields, hasCustomDeleteAllQuery, hasOrderBy, initializeChangeOrderTargetQuery, initializeListOrderField, initializeListOrderFieldTable, isAttributeValueInstantiatedOrChanged, isChangeTrackingSupported, isCollectionMapping, isListOrderFieldSupported, isMapKeyObjectRelationship, iterateOnElement, iterateOnRealAttributeValue, load, loadAll, mergeChangesIntoObject, mergeIntoObject, mustDeleteReferenceObjectsOneByOne, objectAddedDuringUpdate, objectOrderChangedDuringUpdate, objectRemovedDuringUpdate, objectUnchangedDuringUpdate, objectUnchangedDuringUpdate, postCalculateChanges, postDelete, postInsert, postPrepareNestedBatchQuery, prepareTranslationRow, readPrivateOwnedForObject, recordPrivateOwnedRemovals, replaceValueHoldersIn, setChangeListener, setContainerPolicy, setCustomDeleteAllQuery, setDeleteAllCall, setDeleteAllQuery, setDeleteAllSQLString, setHasCustomDeleteAllQuery, setListOrderField, setListOrderFieldName, setMustDeleteReferenceObjectsOneByOne, setOrderCorrectionType, setSelectionQueryContainerPolicy, setSessionName, setUseLazyInstantiationForIndirectCollection, shouldUseLazyInstantiationForIndirectCollection, shouldUseListOrderFieldTableExpression, simpleAddToCollectionChangeRecord, simpleRemoveFromCollectionChangeRecord, updateChangeRecord, updateChangeRecordForSelfMerge, updateCollectionChangeRecord, useCollectionClass, useCollectionClassName, useListClassName, useMapClass, useMapClass, useMapClassName, useSortedSetClass, useSortedSetClassName, useSortedSetClassName, useTransparentCollection, useTransparentList, useTransparentMap, useTransparentSet, validateBeforeInitialization, valueFromPKList, valueFromRowInternalWithJoin, verifyDelete, writeChanges

Methods inherited from class org.eclipse.persistence.mappings.ForeignReferenceMapping

addForeignKeyField, addTargetForeignKeyField, batchedValueFromRow, buildBackupClone, buildBatchCriteria, buildClone, buildCloneFromRow, checkCacheForBatchKey, createCloneValueHolder, dontDoMerge, dontUseBatchReading, dontUseIndirection, extendPessimisticLockScopeInSourceQuery, extendPessimisticLockScopeInTargetQuery, extractBatchKeyFromRow, fixObjectReferences, getAttributeValueFromObject, getAttributeValueWithClonedValueHolders, getBatchFetchType, getExtendPessimisticLockScopeDedicatedQuery, getFieldsForTranslationInAggregate, getIndirectionPolicy, getJoinFetch, getMappedBy, getOrderByNormalizedExpressions, getPartitioningPolicy, getPartitioningPolicyName, getRealAttributeValueFromAttribute, getReferenceClass, getReferenceClassName, getReferenceDescriptor, getRelationshipPartner, getRelationshipPartnerAttributeName, getSelectionCriteria, getSelectionQuery, getTempSession, getValueFromRemoteValueHolder, hasCustomSelectionQuery, hasDependency, hasNestedIdentityReference, initializeReferenceDescriptor, initializeSelectionQuery, instantiateAttribute, isAttributeValueFromObjectInstantiated, isAttributeValueFullyBuilt, isAttributeValueInstantiated, isCascadeDetach, isCascadeMerge, isCascadeOnDeleteSetOnDatabase, isCascadePersist, isCascadeRefresh, isCascadeRemove, isExtendingPessimisticLockScope, isForeignReferenceMapping, isInnerJoinFetched, isJoinFetched, isJoiningSupported, isLazy, isLockableMapping, isOuterJoinFetched, isPrivateOwned, iterate, mergeRemoteValueHolder, preInitialize, prepareHistoricalQuery, prepareNestedBatchQuery, prepareNestedJoinQueryClone, prepareNestedJoins, privateOwnedRelationship, readFromRowIntoObject, remoteInitialization, requiresTransientWeavedFields, setBatchFetchType, setCascadeAll, setCascadeDetach, setCascadeMerge, setCascadePersist, setCascadeRefresh, setCascadeRemove, setCustomSelectionQuery, setForceInitializationOfSelectionCriteria, setHasCustomSelectionQuery, setIndirectionPolicy, setIsCacheable, setIsCascadeOnDeleteSetOnDatabase, setIsPrivateOwned, setJoinFetch, setMappedBy, setPartitioningPolicy, setPartitioningPolicyName, setRealAttributeValueInObject, setReferenceClass, setReferenceClassName, setReferenceDescriptor, setRelationshipPartner, setRelationshipPartnerAttributeName, setRequiresTransientWeavedFields, setSelectionCall, setSelectionCriteria, setSelectionQuery, setSelectionSQLString, setShouldExtendPessimisticLockScope, setTempSession, setUsesBatchReading, setUsesIndirection, shouldExtendPessimisticLockScope, shouldExtendPessimisticLockScopeInDedicatedQuery, shouldExtendPessimisticLockScopeInSourceQuery, shouldExtendPessimisticLockScopeInTargetQuery, shouldForceInitializationOfSelectionCriteria, shouldInitializeSelectionCriteria, shouldMergeCascadeParts, shouldMergeCascadeReference, shouldObjectModifyCascadeToParts, shouldRefreshCascadeParts, shouldUseBatchReading, shouldUseValueFromRowWithJoin, trimRowForJoin, trimRowForJoin, useBasicIndirection, useBatchReading, useContainerIndirection, useInnerJoinFetch, useOuterJoinFetch, usesIndirection, useWeavedIndirection, valueFromRow, valueFromRowInternal, valueFromRowInternal

Methods inherited from class org.eclipse.persistence.mappings.DatabaseMapping

addUnconvertedProperty, buildObjectJoinExpression, buildObjectJoinExpression, buildShallowOriginalFromRow, cloneFields, convertConverterClassNamesToClasses, derivesId, earlyPreDelete, extractNestedExpressions, extractNestedNonAggregateExpressions, getAttributeAccessor, getAttributeClassification, getAttributeName, getDerivedIdMapping, getDescriptor, getFieldClassification, getFields, getGetMethodName, getMapsIdValue, getProperties, getProperty, getRealAttributeValueFromObject, getSelectFields, getSelectTables, getSetMethodName, getUnconvertedProperties, getWeight, hasInverseConstraintDependency, hasMapsIdValue, hasRootExpressionThatShouldUseOuterJoin, hasUnconvertedProperties, isAbstractColumnMapping, isAbstractCompositeCollectionMapping, isAbstractCompositeDirectCollectionMapping, isAbstractCompositeObjectMapping, isAbstractDirectMapping, isAggregateCollectionMapping, isAggregateMapping, isAggregateObjectMapping, isCacheable, isCandidateForPrivateOwnedRemoval, isCascadedLockingSupported, isCloningRequired, isDatabaseMapping, isDirectCollectionMapping, isDirectMapMapping, isDirectToFieldMapping, isDirectToXMLTypeMapping, isEISMapping, isElementCollectionMapping, isInAndOutSopObject, isInOnlySopObject, isInSopObject, isJPAId, isManyToManyMapping, isManyToOneMapping, isMapKeyMapping, isMultitenantPrimaryKeyMapping, isObjectReferenceMapping, isOneToManyMapping, isOneToOneMapping, isOptional, isOutOnlySopObject, isOutSopObject, isOwned, isPrimaryKeyMapping, isReadOnly, isReferenceMapping, isRelationalMapping, isRemotelyInitialized, isStructureMapping, isTransformationMapping, isUnidirectionalOneToManyMapping, isUsingMethodAccess, isVariableOneToOneMapping, isWriteOnly, isXMLMapping, performDataModificationEvent, postCalculateChangesOnDeleted, postInitializeSourceAndTargetExpressions, postUpdate, prepareCascadeLockingPolicy, readFromResultSetIntoObject, readOnly, readWrite, rehashFieldDependancies, remotelyInitialized, setAttributeAccessor, setAttributeName, setAttributeValueInObject, setDerivedIdMapping, setDerivesId, setDescriptor, setFields, setGetMethodName, setIsInAndOutSopObject, setIsInSopObject, setIsJPAId, setIsLazy, setIsMapKeyMapping, setIsOptional, setIsOutSopObject, setIsPrimaryKeyMapping, setIsReadOnly, setMapsIdValue, setProperties, setProperty, setSetMethodName, setWeight, toString, validateAfterInitialization, valueFromObject, valueFromResultSet, valueFromRow, writeFromAttributeIntoRow, writeFromObjectIntoRowForUpdateBeforeShallowDelete, writeFromObjectIntoRowForWhereClause, writeUpdateFieldsIntoRow

Methods inherited from class java.lang.Object

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

Field Details

nestedMapping

protected DatabaseMapping nestedMapping

field

protected DatabaseField field

A ref is always stored in a single field.

structureName

protected String structureName

Arrays require a structure name, this is the ADT defined for the VARRAY.

Constructor Details

NestedTableMapping

public NestedTableMapping()

PUBLIC: Default constructor.

Method Details

buildExpression

public Expression buildExpression(Object queryObject,
 QueryByExamplePolicy policy,
 Expression expressionBuilder,
 Map processedObjects,
 AbstractSession session)

INTERNAL: In case Query By Example is used, this method builds and returns an expression that corresponds to a single attribute and it's value.

Overrides:

buildExpression in class CollectionMapping

Parameters:

queryObject - TODO

policy - TODO

expressionBuilder - TODO

processedObjects - TODO

session - TODO

Returns:

TODO

clone

public Object clone()

INTERNAL: The mapping clones itself to create deep copy

Overrides:

clone in class CollectionMapping

Returns:

new instance of itself

collectFields

protected Vector collectFields()

Returns all the aggregate fields.

Overrides:

collectFields in class DatabaseMapping

Returns:

TODO

getField

public DatabaseField getField()

INTERNAL: Returns the field which this mapping represents.

Overrides:

getField in class DatabaseMapping

Returns:

TODO

getFieldName

public String getFieldName()

PUBLIC: Return the name of the field this mapping represents.

getJoinCriteria

public Expression getJoinCriteria(ObjectExpression context,
 Expression base)

INTERNAL: Join criteria is created to read target records (nested table) from the table.

Overrides:

getJoinCriteria in class CollectionMapping

getStructureName

public String getStructureName()

PUBLIC: Return the structure name of the nestedTable. This is the name of the user defined data type as defined on the database.

hasConstraintDependency

public boolean hasConstraintDependency()

INTERNAL: The returns if the mapping has any constraint dependencies, such as foreign keys and join tables.

Overrides:

hasConstraintDependency in class DatabaseMapping

initialize

public void initialize(AbstractSession session)
                throws DescriptorException

INTERNAL: Initialize the mapping.

Overrides:

initialize in class CollectionMapping

Throws:

DescriptorException

initializeSelectionCriteria

protected void initializeSelectionCriteria(AbstractSession session)

INTERNAL: Selection criteria is created to read target records (nested table) from the table.

isNestedTableMapping

public boolean isNestedTableMapping()

INTERNAL:

Overrides:

isNestedTableMapping in class DatabaseMapping

postInitialize

public void postInitialize(AbstractSession session)
                    throws DescriptorException

INTERNAL: Post Initialize the mapping.

Overrides:

postInitialize in class CollectionMapping

Throws:

DescriptorException

preDelete

public void preDelete(DeleteObjectQuery query)
               throws DatabaseException,
OptimisticLockException

INTERNAL: Delete privately owned parts

Overrides:

preDelete in class DatabaseMapping

Throws:

DatabaseException

OptimisticLockException

preInsert

public void preInsert(WriteObjectQuery query)
               throws DatabaseException,
OptimisticLockException

INTERNAL: Insert privately owned parts

Overrides:

preInsert in class CollectionMapping

Throws:

DatabaseException

OptimisticLockException

preUpdate

public void preUpdate(WriteObjectQuery query)
               throws DatabaseException,
OptimisticLockException

INTERNAL: Update the privately owned parts

Overrides:

preUpdate in class CollectionMapping

Throws:

DatabaseException

OptimisticLockException

setField

protected void setField(DatabaseField theField)

Set the field in the mapping.

setFieldName

public void setFieldName(String FieldName)

PUBLIC: Set the field name in the mapping.

setStructureName

public void setStructureName(String structureName)

PUBLIC: Set the name of the structure. This is the name of the user defined nested table data type as defined on the database.

verifyDeleteForUpdate

protected void verifyDeleteForUpdate(DeleteObjectQuery query)
                              throws DatabaseException,
OptimisticLockException

INTERNAL: Verifying deletes make sure that all the records privately owned by this mapping are actually removed. If such records are found then those are all read and removed one by one taking their privately owned parts into account.

Throws:

DatabaseException

OptimisticLockException

writeFromObjectIntoRow

public void writeFromObjectIntoRow(Object object,
 AbstractRecord record,
 AbstractSession session,
 DatabaseMapping.WriteType writeType)

INTERNAL: Get a value from the object and set that in the respective field of the row.

Overrides:

writeFromObjectIntoRow in class DatabaseMapping

writeFromObjectIntoRowWithChangeRecord

public void writeFromObjectIntoRowWithChangeRecord(ChangeRecord changeRecord,
 AbstractRecord record,
 AbstractSession session,
 DatabaseMapping.WriteType writeType)

INTERNAL: Get a value from the object and set that in the respective field of the row.

Overrides:

writeFromObjectIntoRowWithChangeRecord in class DatabaseMapping

writeFromObjectIntoRowForShallowInsert

public void writeFromObjectIntoRowForShallowInsert(Object object,
 AbstractRecord record,
 AbstractSession session)

INTERNAL: This row is built for shallow insert which happens in case of bidirectional inserts. The foreign keys must be set to null to avoid constraints.

Overrides:

writeFromObjectIntoRowForShallowInsert in class DatabaseMapping

writeFromObjectIntoRowForUpdateAfterShallowInsert

public void writeFromObjectIntoRowForUpdateAfterShallowInsert(Object object,
 AbstractRecord record,
 AbstractSession session,
 DatabaseTable table)

INTERNAL: This row is built for update after shallow insert which happens in case of bidirectional inserts. It contains the foreign keys with non null values that were set to null for shallow insert.

Overrides:

writeFromObjectIntoRowForUpdateAfterShallowInsert in class DatabaseMapping

writeFromObjectIntoRowForShallowInsertWithChangeRecord

public void writeFromObjectIntoRowForShallowInsertWithChangeRecord(ChangeRecord changeRecord,
 AbstractRecord record,
 AbstractSession session)

INTERNAL: This row is built for shallow insert which happens in case of bidirectional inserts. The foreign keys must be set to null to avoid constraints.

Overrides:

writeFromObjectIntoRowForShallowInsertWithChangeRecord in class DatabaseMapping

writeFromObjectIntoRowForUpdate

public void writeFromObjectIntoRowForUpdate(WriteObjectQuery writeQuery,
 AbstractRecord record)
                                     throws DescriptorException

INTERNAL: Write the entire structure into the row as a special type that prints as the constructor. If any part of the structure has changed the whole thing is written.

Overrides:

writeFromObjectIntoRowForUpdate in class DatabaseMapping

Throws:

DescriptorException

writeInsertFieldsIntoRow

public void writeInsertFieldsIntoRow(AbstractRecord record,
 AbstractSession session)

INTERNAL: Write fields needed for insert into the template for with null values.

Overrides:

writeInsertFieldsIntoRow in class DatabaseMapping