Oracle Fusion Middleware Java API Reference for Oracle TopLink (Deprecated)
11g Release 1 (11.1.1)


Class ChangedFieldsLockingPolicy

  extended by oracle.toplink.descriptors.FieldsLockingPolicy
      extended by oracle.toplink.descriptors.ChangedFieldsLockingPolicy
All Implemented Interfaces:, java.lang.Cloneable, oracle.toplink.internal.descriptors.OptimisticLockingPolicy

public class ChangedFieldsLockingPolicy
extends FieldsLockingPolicy

Purpose: An implementation of the OptimisticLockingPolicy interface. This policy compares only the changed fields in the WHERE clause when doing an update. If any field has been changed, an optimistic locking exception will be thrown. A delete will only compare the primary key.

NOTE: This policy can only be used inside a unit of work.

TopLink 2.1
See Also:
Serialized Form

Constructor Summary
          Create a new changed fields locking policy.
Method Summary
Methods inherited from class oracle.toplink.descriptors.FieldsLockingPolicy
isCascaded, isStoredInCache
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public ChangedFieldsLockingPolicy()
Create a new changed fields locking policy. This locking policy is based on locking on all changed fields by comparing with their previous values to detect field-level collisions. Note: the unit of work must be used for all updates when using field locking. Without a unit of work, there is no way for TopLink to know what the original values were without the back up clone in the unit of work.

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