PersistenceContext (Java EE 5 SDK)

javax.persistence Annotation Type PersistenceContext

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

Expresses a dependency on an EntityManager persistence context.

从以下版本开始:

Java Persistence 1.0

name

public abstract String name

The name by which the entity manager is to be accessed in the environment referencing context, and is not needed when dependency injection is used.

默认值:

""

unitName

public abstract String unitName

The name of the persistence unit. If the unitName element is specified, the persistence unit for the entity manager that is accessible in JNDI must have the same name.

默认值:

""

type

public abstract PersistenceContextType type

Specifies whether this is a transaction-scoped persistence context or an extended persistence context.

默认值:

TRANSACTION

properties

public abstract PersistenceProperty[] properties

Used to specify properties for the container or persistence provider. Vendor specific properties may be included in this set of properties. Properties that are not recognized by a vendor are ignored.

默认值:

{}

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