javax.persistence
Annotation Type NamedQuery


@Target(value=TYPE)
@Retention(value=RUNTIME)
public @interface NamedQuery

Specifies a static, named query in the Java Persistence query language. Query names are scoped to the persistence unit. The NamedQuery annotation can be applied to an entity or mapped superclass.

The following is an example of the definition of a named query in the Java Persistence query language:

    @NamedQuery(
            name="findAllCustomersWithName",
            query="SELECT c FROM Customer c WHERE c.name LIKE :custName"
    )
 

The following is an example of the use of a named query:

    @PersistenceContext
    public EntityManager em;
    ...
    customers = em.createNamedQuery("findAllCustomersWithName")
            .setParameter("custName", "Smith")
            .getResultList();
 

Since:
Java Persistence 1.0

Required Element Summary
 java.lang.String name
          (Required) The name used to refer to the query with the EntityManager methods that create query objects.
 java.lang.String query
          (Required) The query string in the Java Persistence query language.
 
Optional Element Summary
 QueryHint[] hints
          (Optional) Query properties and hints.
 LockModeType lockMode
          (Optional) The lock mode type to use in query execution.
 

Element Detail

name

public abstract java.lang.String name
(Required) The name used to refer to the query with the EntityManager methods that create query objects.


query

public abstract java.lang.String query
(Required) The query string in the Java Persistence query language.

lockMode

public abstract LockModeType lockMode
(Optional) The lock mode type to use in query execution. If a lockMode other than LockModeType.NONE is specified, the query must be executed in a transaction.

Since:
Java Persistence 2.0
Default:
javax.persistence.LockModeType.NONE

hints

public abstract QueryHint[] hints
(Optional) Query properties and hints. May include vendor-specific query hints.

Default:
{}


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Generated on 10-February-2011 12:41


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