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@Target(value={METHOD,FIELD}) @Retention(value=RUNTIME) public @interface Version
This annotation specifies the version field or property of an entity class that serves as its optimistic lock value. The version is used to ensure integrity when performing the merge operation and for optimistic concurrency control.
Only a single Version
property or field
should be used per class; applications that use more than one
Version
property or field will not be portable.
The Version
property should be mapped to
the primary table for the entity class; applications that
map the Version
property to a table other than
the primary table will not be portable.
The following types are supported for version properties:
int
, Integer
, short
,
Short
, long
, Long
,
Timestamp
.
Example: @Version @Column(name="OPTLOCK") protected int getVersionNum() { return versionNum; }
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Copyright 2007 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.