NamedQuery (Java EE 5 SDK)

javax.persistence Annotation Type NamedQuery

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

Is used to specify a named query in the Java Persistence query language, which is a static query expressed in metadata. Query names are scoped to the persistence unit.

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();
 

从以下版本开始:

Java Persistence 1.0

name

public abstract String name

Refers to the query when using the EntityManager methods that create query objects.

query

public abstract String query

The query string in the Java Persistence query language

hints

public abstract QueryHint[] hints

Vendor-specific query hints

默认值:

{}

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