Version mapping

Use a Version Mapping to specify the field used for optimistic locking. If the entity is associated with multiple tables, you should use a version mapping only with the primary table. You should have only a single version mapping per persistent entity. Version mappings may be used only with the following attribute types:

• int

• Integer

• short, Short

• long, Long

• Timestamp

To create a version mapping:

1. In the JPA Structure view, select the field to map. The JPA Details view (for attributes) displays the properties for the selected.

2. In the Map As field, select Version.

3. Use this table to complete the remaining fields in the JPA Details view.

   Property	Description	Default
   Column	The database column mapped to the entity attribute. See "Column" for details.	By default, the Column is assumed to be named identically to the attribute and always included in the INSERT and UPDATE statements.
   Table	Name of the database table. This must be the primary table associated with the attribute's entity.
   Temporal	Specifies the type of data. See "Temporal" for details. Date Time Timestamp

   
   

Eclipse adds the following annotations to the field:

@Version
@Column(table="<COLUMN_TABLE>", name="<COLUMN_NAME>")

 

Mapping an entity

 

JPA Structure view
JPA Details view (for attributes)

 

Understanding OR mappings
Understanding EJB 3.0 Java Persistence API