Class NullMapping

java.lang.Object

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

org.datanucleus.store.rdbms.mapping.java.SingleFieldMapping

org.datanucleus.store.rdbms.mapping.java.NullMapping

public class NullMapping
extends SingleFieldMapping

Simple mapping for a null literal. Only used when the type is not determined

Field Summary

Fields inherited from class SingleFieldMapping

EXTENSION_CHECK_CONSTRAINT_VALUES

Fields inherited from class JavaTypeMapping

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

Constructor Summary

Constructors

Constructor	Description
NullMapping(RDBMSStoreManager storeMgr)

Method Summary

Modifier and Type	Method	Description
Class	getJavaType()	Accessor for the java type being mapped.
Object	getObject(org.datanucleus.ExecutionContext ec, ResultSet resultSet, int[] exprIndex)	Obtains a value from datastoreResults at position specified by exprIndex.
void	setObject(org.datanucleus.ExecutionContext ec, PreparedStatement ps, int[] exprIndex, Object value)	Sets a value into datastoreStatement at position specified by exprIndex.

Methods inherited from class SingleFieldMapping

getBoolean, getByte, getChar, getDefaultLength, getDouble, getFloat, getInt, getJavaTypeForColumnMapping, getLong, getShort, getString, getValidValues, initialize, prepareColumnMapping, setBoolean, setByte, setChar, setDouble, setFloat, setInt, setLong, setShort, setString

Methods inherited from class JavaTypeMapping

addColumnMapping, equals, failureMessage, getAbsoluteFieldNumber, getColumnMapping, getColumnMappings, getColumnMetaDataForMember, getMemberMetaData, getNumberOfColumnMappings, getObject, getReferenceMapping, getRoleForMember, getStoreManager, getTable, getType, getValueForColumnMapping, hashCode, hasSimpleDatastoreRepresentation, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, initialize, isNullable, isSerialised, performSetPostProcessing, representableAsStringLiteralInStatement, requiresSetPostProcessing, setAbsFieldNumber, setMemberMetaData, setObject, setReferenceMapping, setRoleForMember, setTable

Methods inherited from class Object

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

Constructor Details

NullMapping

public NullMapping(RDBMSStoreManager storeMgr)

Method Details

getJavaType

public Class getJavaType()

Description copied from class: JavaTypeMapping

Accessor for the java type being mapped. This is the java type that the mapping represents. Some examples :

• if the field is of type "MyClass" then the mapping will be OIDMapping (or subclass) the javaType will be OID, and the type will be MyClass.
• if the field is of type "int" then the mapping will be IntegerMapping, the javaType will be Integer, and the type will be int.

The "java type" is the java-type name used in the plugin.xml mapping file

Specified by:

getJavaType in class JavaTypeMapping

Returns:

The java type

getObject

public Object getObject(org.datanucleus.ExecutionContext ec,
 ResultSet resultSet,
 int[] exprIndex)

Description copied from class: JavaTypeMapping

Obtains a value from datastoreResults at position specified by exprIndex.

Overrides:

getObject in class SingleFieldMapping

Parameters:

ec - ExecutionContext

resultSet - ResultSet

exprIndex - the position of the value in the result

Returns:

the value

setObject

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

Description copied from class: JavaTypeMapping

Sets a value into datastoreStatement at position specified by exprIndex.

Overrides:

setObject in class SingleFieldMapping

Parameters:

ec - ExecutionContext

ps - PreparedStatement

exprIndex - the position of the value in the statement

value - the value