Class ForeignKey

java.lang.Object

org.datanucleus.store.rdbms.key.Key

org.datanucleus.store.rdbms.key.ForeignKey

public class ForeignKey
extends Key

Representation of a foreign key to another table.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	ForeignKey.FKAction	Enum representing an action on the FK.

Field Summary

Fields

Modifier and Type	Field	Description
private DatastoreAdapter	dba
private ForeignKey.FKAction	deleteAction
private String	foreignKeyDefinition
private boolean	initiallyDeferred
private List<Column>	refColumns
private DatastoreClass	refTable
private ForeignKey.FKAction	updateAction

Fields inherited from class Key

columns, name, table

Constructor Summary

Constructors

Constructor	Description
ForeignKey(DatastoreAdapter dba, boolean initiallyDeferred)	Constructor.
ForeignKey(JavaTypeMapping mapping, DatastoreAdapter dba, DatastoreClass refTable, boolean initiallyDeferred)	Constructor.

Method Summary

Modifier and Type	Method	Description
void	addColumn(Column col, Column refCol)	Method to add a Column.
boolean	equals(Object obj)	Equality operator.
String	getRefColumnList()
DatastoreClass	getRefTable()
int	hashCode()	Hashcode operator.
boolean	isEqual(ForeignKey fk)
void	setColumn(int seq, Column col, Column refCol)	Set the column for the specified position seq
void	setDeleteAction(ForeignKey.FKAction deleteAction)	Mutator for deleteAction.
void	setForMetaData(org.datanucleus.metadata.ForeignKeyMetaData fkmd)	Convenience mutator for setting the specification based on MetaData
void	setUpdateAction(ForeignKey.FKAction updateAction)	Mutator for updateAction.
String	toString()	Stringify method.

Methods inherited from class Key

addColumn, assertSameDatastoreObject, getColumnList, getColumnList, getColumns, getName, getNumberOfColumns, getTable, setColumn, setListMinimumSize, setName

Methods inherited from class Object

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

Field Details

dba

private DatastoreAdapter dba

initiallyDeferred

private boolean initiallyDeferred

refTable

private DatastoreClass refTable

updateAction

private ForeignKey.FKAction updateAction

deleteAction

private ForeignKey.FKAction deleteAction

refColumns

private List<Column> refColumns

foreignKeyDefinition

private String foreignKeyDefinition

Constructor Details

ForeignKey

public ForeignKey(DatastoreAdapter dba,
 boolean initiallyDeferred)

Constructor.

Parameters:

dba - Datastore adapter

initiallyDeferred - Whether the constraints are deferred

ForeignKey

public ForeignKey(JavaTypeMapping mapping,
 DatastoreAdapter dba,
 DatastoreClass refTable,
 boolean initiallyDeferred)

Constructor.

Parameters:

mapping - The type mapping for this Foreign-key field

dba - Datastore adapter

refTable - Referred to table

initiallyDeferred - Whether they are deferred

Method Details

setForMetaData

public void setForMetaData(org.datanucleus.metadata.ForeignKeyMetaData fkmd)

Convenience mutator for setting the specification based on MetaData

Parameters:

fkmd - ForeignKey MetaData definition

setDeleteAction

public void setDeleteAction(ForeignKey.FKAction deleteAction)

Mutator for deleteAction.

Parameters:

deleteAction - The deleteAction to set.

setUpdateAction

public void setUpdateAction(ForeignKey.FKAction updateAction)

Mutator for updateAction.

Parameters:

updateAction - The updateAction to set.

addColumn

public void addColumn(Column col,
 Column refCol)

Method to add a Column.

Parameters:

col - The column to add

refCol - The column to reference

getRefTable

public DatastoreClass getRefTable()

getRefColumnList

public String getRefColumnList()

setColumn

public void setColumn(int seq,
 Column col,
 Column refCol)

Set the column for the specified position seq

Parameters:

seq - the specified position

col - the column

refCol - the foreign (refered) column

hashCode

public int hashCode()

Description copied from class: Key

Hashcode operator.

Overrides:

hashCode in class Key

Returns:

The hashcode

equals

public boolean equals(Object obj)

Description copied from class: Key

Equality operator.

Overrides:

equals in class Key

Parameters:

obj - Object to compare against

Returns:

Whether they are equal.

isEqual

public boolean isEqual(ForeignKey fk)

toString

public String toString()

Stringify method. Generates the foreign key statement ready for use in an SQL call.

Overrides:

toString in class Object

Returns:

String version of this object.