详解Hibernate注解方式的二级缓存_JSP编程_

truenet.sf.ehcache.hibernate.EhCacheProvider

 @Cache(usage=CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)

 //实体类@cacheable @Entity @Cacheable @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) public class Forest { ... } //集合类@cache @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER) @JoinColumn(name="CUST_ID") @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) public SortedSet getTickets() { return tickets; } 

 @Test public void testFind() {//Model1是使用了二级缓存的，这里只会发出一条sql语句 Session session = factory.openSession(); Model1 model = (Model1)session.get(Model1.class, 1); System.out.println(model.getId()); Session session2 = factory.openSession(); Model1 model2 = (Model1)session2.get(Model1.class, 1); System.out.println(model2.getId()); session.close(); session2.close(); } @Test public void testFind2() {//Model2没有进行二级缓存，所以这里会发出两条sql语句 Session session = factory.openSession(); Model2 model = (Model2)session.get(Model2.class, 1); System.out.println(model.getId()); Session session2 = factory.openSession(); Model2 model2 = (Model2)session2.get(Model2.class, 1); System.out.println(model2.getId()); session.close(); session2.close(); } 

 @Test public void testFind4() { //在没有给Model1里面的models加上二级缓存的注解@Cache之前， //不同的Session里面的同一个对象使用models的时候会发出多条sql语句 //而加上了@Cache之后，下面只会发出一条SQL语句 Session session = factory.openSession(); Model1 model = (Model1)session.get(Model1.class, 1); List models = model.getModels(); for (Model2 mode2: models) { System.out.println(mode2.getId()); } Session session2 = factory.openSession(); Model1 model1 = (Model1)session2.get(Model1.class, 1); List models2 = model1.getModels(); for (Model2 model2: models2) { System.out.println(model2.getId()); } session.close(); session2.close(); } 

 @OneToMany(mappedBy="model1") @Cache(usage=CacheConcurrencyStrategy.READ_ONLY) public List getModels() { return models; }