Hibernate 系列教程17-查询缓存

在二级缓存配置成功的基础上进行查询缓存配置

Product

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

Product.hbm.xml

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

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();
  }
}

源码地址

https://github.com/je-ge/hibernate

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