Hibernate延迟加载关联lazy特征：hibernate在单端关联上的lazy策略，可以取值：false/proxy/noproxy。<class>标签上的lazy不会影响到单端关联上的lazy特性。代码实例实现：
SingleEndTest1.java
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/** * 所有lazy属性默认 */ public class SingleEndTest1 extends TestCase {
public void testLoad1() { Session session = null; try { session = HibernateUtils.getSession(); session.beginTransaction(); //不会发出sql User user = (User)session.load(User.class, 1); //会发出sql System.out.println(“user.name=” + user.getName()); //不会发出sql Group group = user.getGroup(); //会发出sql System.out.println(“group.name=” + group.getName()); session.getTransaction().commit(); }catch(Exception e) { e.printStackTrace(); session.getTransaction().rollback(); }finally { HibernateUtils.closeSession(session); } } } |
SingleEndTest2.java
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/** * 将<many-to-one>中的lazy设置为false,其它默认 * */ public class SingleEndTest2 extends TestCase { public void testLoad1() { Session session = null; try { session = HibernateUtils.getSession(); session.beginTransaction(); //不会发出sql User user = (User)session.load(User.class, 1); //会发出sql，发出两条sql分别加载User和Group System.out.println(“user.name=” + user.getName()); //不会发出sql Group group = user.getGroup(); //不会发出sql System.out.println(“group.name=” + group.getName()); session.getTransaction().commit(); }catch(Exception e) { e.printStackTrace(); session.getTransaction().rollback(); }finally { HibernateUtils.closeSession(session); } } } |