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oracle.toplink.descriptors
Class RelationalDescriptor

java.lang.Object
oracle.toplink.descriptors.ClassDescriptor
oracle.toplink.descriptors.RelationalDescriptor

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:

ObjectRelationalDescriptor

public class RelationalDescriptor

extends ClassDescriptor

Purpose: TopLink has been designed to take advantage of the similarities between relational databases and objects while accommodating for their differences, providing an object oriented wrapper for relational databases. This is accomplished through the use of Descriptors. A descriptor is a pure specification class with all its behaviour deputized to DescriptorEventManager, DescriptorQueryManager and ObjectBuilder. Look at the following variables for the list of specification on the descriptor.

A Descriptor is a set of mappings that describe how an objects's data is to be represented in a relational database. It contains mappings from the class instance variables to the table's fields, as well as the transformation routines necessary for storing and retrieving attributes. As such the descriptor acts as the link between the Java object and its database representaiton.

Every descripor is initialized with the following information:

• The Java class its describes, and the corresponding table(s) for storing instances of the class.
• The primary key of the table.
• A list of query keys for field names.
• A description of the objects's attributes and relationships. This information is stored in mappings.
• A set of user selectable properties for tailoring the behaviour of the descriptor.

This descriptor subclass should be used for object-relational mapping, and allows for other datatype mappings to be done in the XML, EIS and OR sibling classes.

See Also:

DescriptorEventManager, DescriptorQueryManager, InheritancePolicy, InterfacePolicy, Serialized Form

Field Summary

Fields inherited from class oracle.toplink.descriptors.ClassDescriptor

DO_NOT_SEND_CHANGES, INVALIDATE_CHANGED_OBJECTS, ISOLATE_CACHE_AFTER_TRANSACTION, ISOLATE_CACHE_ALWAYS, ISOLATE_NEW_DATA_AFTER_TRANSACTION, SEND_NEW_OBJECTS_WITH_CHANGES, SEND_OBJECT_CHANGES, UNDEFINED_ISOLATATION, UNDEFINED_OBJECT_CHANGE_BEHAVIOR, USE_SESSION_CACHE_AFTER_TRANSACTION

Constructor Summary

RelationalDescriptor()
Return a new descriptor.

Method Summary

void	addTableName(java.lang.String tableName) Specify the table name for the class of objects the receiver describes.
java.lang.String	getTableName() Return the name of the descriptor's first table.
java.util.Vector	getTableNames() Return the table names.
void	setDefaultTableName(java.lang.String defaultTableName) The descriptors default table can be configured if the first table is not desired.
void	setTableName(java.lang.String tableName) Specify the table name for the class of objects the receiver describes.
void	setTableNames(java.util.Vector tableNames) Specify the all table names for the class of objects the receiver describes.
void	setTableQualifier(java.lang.String tableQualifier) Set the table Qualifier for this descriptor.

Methods inherited from class oracle.toplink.descriptors.ClassDescriptor

addAbstractQueryKey, addConstraintDependencies, addDirectMapping, addDirectMapping, addDirectQueryKey, addForeignKeyFieldForMultipleTable, addForeignKeyFieldNameForMultipleTable, addMapping, addMultipleTableForeignKeyField, addMultipleTableForeignKeyFieldName, addMultipleTablePrimaryKeyField, addMultipleTablePrimaryKeyFieldName, addPrimaryKeyField, addPrimaryKeyFieldName, addQueryKey, addTable, alwaysConformResultsInUnitOfWork, alwaysRefreshCache, alwaysRefreshCacheOnRemote, applyAmendmentMethod, createCopyPolicy, createInstantiationPolicy, descriptorIsAggregate, descriptorIsAggregateCollection, descriptorIsForInterface, descriptorIsNormal, disableCacheHits, disableCacheHitsOnRemote, dontAlwaysConformResultsInUnitOfWork, dontAlwaysRefreshCache, dontAlwaysRefreshCacheOnRemote, dontDisableCacheHits, dontDisableCacheHitsOnRemote, dontOnlyRefreshCacheIfNewerVersion, getAlias, getAmendmentClass, getAmendmentMethodName, getCacheInvalidationPolicy, getCacheSynchronizationType, getCMPPolicy, getConstraintDependencies, getDescriptorEventManager, getDescriptorInheritancePolicy, getDescriptorQueryManager, getDescriptorType, getEventManager, getFetchGroupManager, getHistoryPolicy, getIdentityMapSize, getInheritancePolicy, getInterfacePolicy, getJavaClass, getJavaClassName, getMappingForAttributeName, getMappings, getObjectChangePolicy, getOptimisticLockingPolicy, getPrimaryKeyFieldNames, getProperties, getProperty, getQueryKeys, getQueryManager, getRemoteIdentityMapSize, getReturningPolicy, getSequenceNumberFieldName, getSequenceNumberName, getUnitOfWorkCacheIsolationLevel, getWrapperPolicy, isAggregateCollectionDescriptor, isAggregateDescriptor, isChildDescriptor, isDescriptorForInterface, isIsolated, isNativeConnectionRequired, isObjectRelationalDescriptor, onlyRefreshCacheIfNewerVersion, removeMappingForAttributeName, removeProperty, setAlias, setAmendmentClass, setAmendmentMethodName, setCacheInvalidationPolicy, setCacheSynchronizationType, setCMPPolicy, setConstraintDependencies, setDescriptorType, setFetchGroupManager, setHistoryPolicy, setIdentityMapClass, setIdentityMapSize, setIsIsolated, setIsNativeConnectionRequired, setJavaClass, setJavaInterface, setMultipleTableInsertOrder, setObjectChangePolicy, setOptimisticLockingPolicy, setPrimaryKeyFieldName, setPrimaryKeyFieldNames, setProperty, setReadOnly, setRemoteIdentityMapClass, setRemoteIdentityMapSize, setReturningPolicy, setSequenceNumberFieldName, setSequenceNumberName, setShouldAlwaysConformResultsInUnitOfWork, setShouldAlwaysRefreshCache, setShouldAlwaysRefreshCacheOnRemote, setShouldBeReadOnly, setShouldDisableCacheHits, setShouldDisableCacheHitsOnRemote, setShouldOnlyRefreshCacheIfNewerVersion, setShouldOrderMappings, setUnitOfWorkCacheIsolationLevel, setWrapperPolicy, shouldAlwaysConformResultsInUnitOfWork, shouldAlwaysRefreshCache, shouldAlwaysRefreshCacheOnRemote, shouldBeReadOnly, shouldDisableCacheHits, shouldDisableCacheHitsOnRemote, shouldOnlyRefreshCacheIfNewerVersion, shouldUseCacheIdentityMap, shouldUseFullIdentityMap, shouldUseHardCacheWeakIdentityMap, shouldUseNoIdentityMap, shouldUseRemoteCacheIdentityMap, shouldUseRemoteFullIdentityMap, shouldUseRemoteHardCacheWeakIdentityMap, shouldUseRemoteNoIdentityMap, shouldUseRemoteSoftCacheWeakIdentityMap, shouldUseRemoteSoftIdentityMap, shouldUseRemoteWeakIdentityMap, shouldUseSoftCacheWeakIdentityMap, shouldUseSoftIdentityMap, shouldUseWeakIdentityMap, toString, useAllFieldsLocking, useCacheIdentityMap, useChangedFieldsLocking, useCloneCopyPolicy, useCloneCopyPolicy, useDefaultConstructorInstantiationPolicy, useFactoryInstantiationPolicy, useFactoryInstantiationPolicy, useFactoryInstantiationPolicy, useFullIdentityMap, useHardCacheWeakIdentityMap, useInstantiationCopyPolicy, useMethodInstantiationPolicy, useNoIdentityMap, useRemoteCacheIdentityMap, useRemoteFullIdentityMap, useRemoteHardCacheWeakIdentityMap, useRemoteNoIdentityMap, useRemoteSoftCacheWeakIdentityMap, useRemoteSoftIdentityMap, useRemoteWeakIdentityMap, useSelectedFieldsLocking, useSoftCacheWeakIdentityMap, useSoftIdentityMap, usesOptimisticLocking, usesSequenceNumbers, usesVersionLocking, useTimestampLocking, useTimestampLocking, useVersionLocking, useVersionLocking, useWeakIdentityMap

Methods inherited from class java.lang.Object

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

Constructor Detail

RelationalDescriptor

public RelationalDescriptor()

Return a new descriptor.

Method Detail

addTableName

public void addTableName(java.lang.String tableName)

Specify the table name for the class of objects the receiver describes. If the table has a qualifier it should be specified using the dot notation, (i.e. "userid.employee"). This method is used if there is more than one table.

Overrides:

addTableName in class ClassDescriptor

getTableName

public java.lang.String getTableName()

Return the name of the descriptor's first table. This method must only be called on single table descriptors.

Overrides:

getTableName in class ClassDescriptor

getTableNames

public java.util.Vector getTableNames()

Return the table names.

Overrides:

getTableNames in class ClassDescriptor

setDefaultTableName

public void setDefaultTableName(java.lang.String defaultTableName)

The descriptors default table can be configured if the first table is not desired.

Overrides:

setDefaultTableName in class ClassDescriptor

setTableName

public void setTableName(java.lang.String tableName)
                  throws DescriptorException

Specify the table name for the class of objects the receiver describes. If the table has a qualifier it should be specified using the dot notation, (i.e. "userid.employee"). This method is used for single table.

Overrides:

setTableName in class ClassDescriptor

Throws:

DescriptorException

setTableNames

public void setTableNames(java.util.Vector tableNames)

Specify the all table names for the class of objects the receiver describes. If the table has a qualifier it should be specified using the dot notation, (i.e. "userid.employee"). This method is used for multiple tables

Overrides:

setTableNames in class ClassDescriptor

setTableQualifier

public void setTableQualifier(java.lang.String tableQualifier)

Set the table Qualifier for this descriptor. This table creator will be used for all tables in this descriptor

Overrides:

setTableQualifier in class ClassDescriptor

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