EclipseLink 2.2.0, build 'v20110202-r8913' API Reference

org.eclipse.persistence.annotations
Annotation Type UnionPartitioning


@Target(value={TYPE,METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface UnionPartitioning

UnionPartitioning sends queries to all connection pools and unions the results. This is for queries or relationships that span partitions when partitioning is used, such as on a ManyToMany cross partition relationship.

Partitioning can be enabled on an Entity, relationship, query, or session/persistence unit. Partition policies are globally named to allow reuse, the partitioning policy must also be set using the @Partitioned annotation to be used.

See Also:
Partitioned, UnionPartitioningPolicy
Author:
James Sutherland
Since:
EclipseLink 2.2

Required Element Summary
 java.lang.String name
          The name of the partition policy, names must be unique for the persistence unit.
 
Optional Element Summary
 java.lang.String[] connectionPools
          List of connection pool names to load balance across.
 boolean replicateWrites
          Defines if write queries should be replicated.
 

Element Detail

name

public abstract java.lang.String name
The name of the partition policy, names must be unique for the persistence unit.

connectionPools

public abstract java.lang.String[] connectionPools
List of connection pool names to load balance across. Defaults to all defined pools in the ServerSession.

Default:
{}

replicateWrites

public abstract boolean replicateWrites
Defines if write queries should be replicated. Writes are normally not replicated when unioning, but can be for ManyToMany relationships, when the join table needs to be replicated.

Default:
false

EclipseLink 2.2.0, build 'v20110202-r8913' API Reference