org.jpox.metadata
Class ForeignKeyUpdateAction

java.lang.Object
  org.jpox.metadata.ForeignKeyAction
      org.jpox.metadata.ForeignKeyUpdateAction

All Implemented Interfaces:

java.io.Serializable

public class ForeignKeyUpdateAction
extends ForeignKeyAction

Foreign keys represent a consistency constraint in the database that must be maintained. The user can specify by the update-action attribute what happens if the target row of a foreign key is updated See jdo specification 2.0 §15.5

Since:

1.1

Version:

$Revision: 1.3 $

See Also:

Serialized Form

Field Summary

static ForeignKeyUpdateAction	CASCADE update-action="cascade".
static ForeignKeyUpdateAction	DEFAULT update-action="default".
static ForeignKeyUpdateAction	DEFAULT_ACTION the default action
static ForeignKeyUpdateAction	NULL update-action="null".
static ForeignKeyUpdateAction	RESTRICT update-action="restrict".

Method Summary

static ForeignKeyUpdateAction	getForeignKeyUpdateAction(java.lang.String value) Return ForeignKeyUpdateAction from String.
java.lang.String	toString() Returns a string representation of the object.

Methods inherited from class org.jpox.metadata.ForeignKeyAction

equals, getType

Methods inherited from class java.lang.Object

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

Field Detail

CASCADE

public static final ForeignKeyUpdateAction CASCADE

update-action="cascade". The database will automatically update all rows that refer to the row being updated

RESTRICT

public static final ForeignKeyUpdateAction RESTRICT

update-action="restrict". The user is required to explicitly make the relationship valid by application code

NULL

public static final ForeignKeyUpdateAction NULL

update-action="null". The database will automatically nullify the columns in all rows that refer to the row being updated

DEFAULT

public static final ForeignKeyUpdateAction DEFAULT

update-action="default". The database will automatically set the columns in all rows that refer to the row being updated to their default value

DEFAULT_ACTION

public static final ForeignKeyUpdateAction DEFAULT_ACTION

the default action

Method Detail

toString

public java.lang.String toString()

Returns a string representation of the object.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of the object.

getForeignKeyUpdateAction

public static ForeignKeyUpdateAction getForeignKeyUpdateAction(java.lang.String value)

Return ForeignKeyUpdateAction from String.

Parameters:

value - update-action attribute value

Returns:

Instance of ForeignKeyUpdateAction. If value invalid, return null.