Class ReferenceIdMapping

java.lang.Object

org.datanucleus.store.rdbms.mapping.java.JavaTypeMapping

org.datanucleus.store.rdbms.mapping.java.MultiMapping

org.datanucleus.store.rdbms.mapping.java.MultiPersistableMapping

org.datanucleus.store.rdbms.mapping.java.ReferenceMapping

org.datanucleus.store.rdbms.mapping.java.ReferenceIdMapping

All Implemented Interfaces:

MappingCallbacks

public class ReferenceIdMapping
extends ReferenceMapping

Maps to identity objects of reference values. Used only from within JDOQL queries on JDOHelper.getObjectId expressions

Field Summary

Fields inherited from class ReferenceMapping

ID_MAPPING, mappingStrategy, PER_IMPLEMENTATION_MAPPING, XCALIA_MAPPING

Fields inherited from class MultiMapping

javaTypeMappings, numberOfColumnMappings

Fields inherited from class JavaTypeMapping

absFieldNumber, columnMappings, mmd, referenceMapping, roleForMember, storeMgr, table, type

Constructor Summary

Constructors

Constructor	Description
ReferenceIdMapping(ReferenceMapping refMapping)	Constructor used to generate a ReferenceMapping representing only the identity of the object.

Method Summary

Modifier and Type	Method	Description
Object	getObject(org.datanucleus.ExecutionContext ec, ResultSet rs, int[] param)	Returns an identity for a persistable class.
void	setObject(org.datanucleus.ExecutionContext ec, PreparedStatement ps, int[] param, Object value)	Method to set the object based on an input identity.

Methods inherited from class ReferenceMapping

createPerImplementationColumnsForReferenceField, getJavaType, getJavaTypeForColumnMapping, getJavaTypeMappingForType, getMappingNumberForValue, getMappingStrategy, getObjectForReferenceString, getReferenceStringForObject, initialize, preDelete, prepareColumnMapping, setObject

Methods inherited from class MultiMapping

addJavaTypeMapping, getColumnMapping, getColumnMappings, getJavaTypeMapping, getNumberOfColumnMappings

Methods inherited from class JavaTypeMapping

addColumnMapping, equals, failureMessage, getAbsoluteFieldNumber, getBoolean, getByte, getChar, getColumnMetaDataForMember, getDouble, getFloat, getInt, getLong, getMemberMetaData, getObject, getReferenceMapping, getRoleForMember, getShort, getStoreManager, getString, getTable, getType, getValueForColumnMapping, hashCode, hasSimpleDatastoreRepresentation, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, initialize, isNullable, isSerialised, performSetPostProcessing, representableAsStringLiteralInStatement, requiresSetPostProcessing, setAbsFieldNumber, setBoolean, setByte, setChar, setDouble, setFloat, setInt, setLong, setMemberMetaData, setReferenceMapping, setRoleForMember, setShort, setString, setTable

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface MappingCallbacks

postFetch, postInsert, postUpdate

Constructor Details

ReferenceIdMapping

public ReferenceIdMapping(ReferenceMapping refMapping)

Constructor used to generate a ReferenceMapping representing only the identity of the object. This is typically used where the user has selected the id in a JDOQL query as a result field.

Parameters:

refMapping - The mapping to base it on

Method Details

getObject

public Object getObject(org.datanucleus.ExecutionContext ec,
 ResultSet rs,
 int[] param)

Returns an identity for a persistable class. Processes a FK field and finds the object that it relates to, then returns the identity.

Overrides:

getObject in class ReferenceMapping

Parameters:

ec - execution context

rs - The ResultSet

param - Array of parameter ids in the ResultSet to retrieve

Returns:

The id of the PC object.

setObject

public void setObject(org.datanucleus.ExecutionContext ec,
 PreparedStatement ps,
 int[] param,
 Object value)

Method to set the object based on an input identity.

Overrides:

setObject in class MultiPersistableMapping

Parameters:

ec - execution context

ps - PreparedStatement

param - Parameter positions to populate when setting the value

value - The identity