javax.persistence.Entity

最新推荐文章于 2023-02-02 09:59:50 发布

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本文详细介绍了Java持久化API (JPA) 中的@Entity注解，该注解用于指定一个类作为实体对象，包括其基本用法、属性设置等关键信息。

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请问在java中javax.persistence.Entity是属于哪个j文件 ?

hibernate-distribution-3.6.5.Final-dist\hibernate-distribution-3.6.5.Final\lib\jpa
目录下的  hibernate-jpa-2.0-api-1.0.0.Final.jar

/*******************************************************************************
 * Copyright (c) 2008 - 2013 Oracle Corporation. 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 2.1
 *     Linda DeMichiel - Java Persistence 2.0
 *
 ******************************************************************************/
package javax.persistence;
 
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import java.lang.annotation.Documented;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
 
/**
 * Specifies that the class is an entity. This annotation is applied to the
 * entity class.
 *
 * @since Java Persistence 1.0
 */
@Documented
@Target(TYPE)
@Retention(RUNTIME)
public @interface Entity {
 
    /**
     * (Optional) The entity name. Defaults to the unqualified
     * name of the entity class. This name is used to refer to the
     * entity in queries. The name must not be a reserved literal
     * in the Java Persistence query language.
     */
    String name() default "";
}