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package javax.persistence;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/** 
 * 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();
 * 
 *
 * @since Java Persistence 1.0
 */
@Target({TYPE}) 
@Retention(RUNTIME)
public @interface NamedQuery {

    /** 
     * Refers to the query when using the {@link EntityManager} 
     * methods that create query objects. 
     */
    String name();

    /** The query string in the Java Persistence query language */
    String query();

    /** Vendor-specific query hints */
    QueryHint[] hints() default {};
}