src/javax/persistence/NamedQuery.java

/*******************************************************************************
 * Copyright (c) 2008, 2009 Sun Microsystems. All rights reserved. 
 * 
 * This program and the accompanying materials are made available under the 
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 
 * which accompanies this distribution. 
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at 
 * http://www.eclipse.org/org/documents/edl-v10.php.
 * 
 * Contributors:
 *     Linda DeMichiel -Java Persistence 2.0 - Proposed Final Draft, Version 2.0 (August 31, 2009)
 *     Specification available from http://jcp.org/en/jsr/detail?id=317
 *
 * Java(TM) Persistence API, Version 2.0 - EARLY ACCESS
 * This is an implementation of an early-draft specification developed under the 
 * Java Community Process (JCP).  The code is untested and presumed not to be a  
 * compatible implementation of JSR 317: Java(TM) Persistence API, Version 2.0.   
 * We encourage you to migrate to an implementation of the Java(TM) Persistence 
 * API, Version 2.0 Specification that has been tested and verified to be compatible 
 * as soon as such an implementation is available, and we encourage you to retain 
 * this notice in any implementation of Java(TM) Persistence API, Version 2.0 
 * Specification that you distribute.
 ******************************************************************************/
package javax.persistence;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static javax.persistence.LockModeType.NONE;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/** 
 * Specifies a static, named query in the Java Persistence query language.
 * Query names are scoped to the persistence unit.
 * The <code>NamedQuery</code> annotation can be applied to an entity or mapped superclass.
 *
 * <p> The following is an example of the definition of a named query 
 * in the Java Persistence query language:
 *
 * <pre>
 *    &#064;NamedQuery(
 *            name="findAllCustomersWithName",
 *            query="SELECT c FROM Customer c WHERE c.name LIKE :custName"
 *    )
 * </pre>
 *
 * <p> The following is an example of the use of a named query:
 *
 * <pre>
 *    &#064;PersistenceContext
 *    public EntityManager em;
 *    ...
 *    customers = em.createNamedQuery("findAllCustomersWithName")
 *            .setParameter("custName", "Smith")
 *            .getResultList();
 * </pre>
 *
 * @since Java Persistence 1.0
 */
@Target({TYPE}) 
@Retention(RUNTIME)
public @interface NamedQuery {

    /** 
     * (Required) The name used to refer to the query with the {@link EntityManager} 
     * methods that create query objects. 
     */
    String name();

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

    /** 
     * (Optional) The lock mode type to use in query execution.  If a <code>lockMode</code>
     * other than <code>LockModeType.NONE</code> is specified, the query must be executed in
     * a transaction.
     * @since Java Persistence API 2.0
     */
    LockModeType lockMode() default NONE;
    
    /** (Optional) Query properties and hints.  May include
     * vendor-specific query hints. 
     */
    QueryHint[] hints() default {};
}