Hibernate 菜鸟教程 17 查询缓存

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配置

模型对象Product

public class Product {
private Long id;
private String name;

映射文件Product.hbm.xml

<class name="Product">
<id name="id">
<generator class="native" />
</id>
<property name="name" />
</class>

测试对象MainTest

public class MainTest {
@Before
public void save() throws Exception {
Product product = new Product();
product.setName("xxxx");

Session session = HibernateUtils.INSTANCE.getSession();
session.beginTransaction();
session.save(product);
session.getTransaction().commit();
session.close();
}

// 模拟同一个SessionFactory,不同session获取hql查询
// 查询缓存需要先配置类的二级缓存
// 只发出一条sql：查询缓存命中
@Test
public void get() throws Exception {
Session session1 = HibernateUtils.INSTANCE.getSession();
String hql = "select p from Product p";
Query query = session1.createQuery(hql);
// 放入查询缓存
query.setCacheable(true);
System.out.println(query.list().size());
session1.close();

Session session2 = HibernateUtils.INSTANCE.getSession();
String hql2 = "from Product";
Query query2 = session2.createQuery(hql2);
// 从查询缓存取
query2.setCacheable(true);
System.out.println(query2.list().size());
session2.close();
}
}

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