<?xml version="1.0" encoding="UTF-8" ?>


  
    
    
    
    
    
    
    
    
  
  
    
    
  
  
    
      
      
      
      
        
        
        
        
      
    
  
  
    
  

public class User implements Serializable{
  private Integer userId;
  private String userName;
  private Date userBirthday;
  private String userSex;
  private String userAddress;
  private List accounts;
  省略get和set方法...... 
}

import com.example.domain.User;
import org.apache.ibatis.annotations.*;
import org.apache.ibatis.mapping.FetchType;

import java.util.List;
@CacheNamespace(blocking = true)
public interface UserDao {
  /**
   * 查找所有用户
   * @return
   */
  @Select("select * from User")
  @Results(id = "userMap",value = {@Result(id = true,column = "id",property = "userId"),
      @Result(column = "username",property = "userName"),
      @Result(column = "birthday",property = "userBirthday"),
      @Result(column = "sex",property = "userSex"),
      @Result(column = "address",property = "userAddress"),
      @Result(column = "id",property = "accounts",many = @Many(select = "com.example.dao.AccountDao.findAccountByUid",fetchType = FetchType.LAZY))
  })
  List findAll();

  /**
   * 保存用户
   * @param user
   */
  @Insert("insert into user(username,birthday,sex,address) values(#{username},#{birthday},#{sex},#{address})")
  void saveUser(User user);

  /**
   * 更新用户
   * @param user
   */
  @Update("update user set username=#{username},birthday=#{birthday},sex=#{sex},address=#{address} where id=#{id}")
  void updateUser(User user);

  /**
   * 删除用户
   * @param id
   */
  @Delete("delete from user where id=#{id}")
  void deleteUser(Integer id);

  /**
   * 查询用户根据ID
   * @param id
   * @return
   */
  @Select("select * from user where id=#{id}")
  @ResultMap(value = {"userMap"})
  User findById(Integer id);

  /**
   * 根据用户名称查询用户
   * @param name
   * @return
   */
//  @Select("select * from user where username like #{name}")
  @Select("select * from user where username like '%${value}%'")
  List findByUserName(String name);

  /**
   * 查询用户数量
   * @return
   */
  @Select("select count(*) from user")
  int findTotalUser();
}

public class UserCacheTest {

  private InputStream in;
  private SqlSessionFactory sqlSessionFactory;

  @Before
  public void init()throws Exception{
    in = Resources.getResourceAsStream("SqlMapConfig.xml");
    sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);

  }
  @After
  public void destory()throws Exception{
    in.close();
  }
  @Test
  public void testFindById(){
    //第一查询
    SqlSession sqlSession1 = sqlSessionFactory.openSession();
    UserDao userDao1 = sqlSession1.getMapper(UserDao.class);
    User user1 = userDao1.findById(41);
    System.out.println(user1);
    //关闭一级缓存
    sqlSession1.close();
    //第二次查询
    SqlSession sqlSession2 = sqlSessionFactory.openSession();
    UserDao userDao2 = sqlSession2.getMapper(UserDao.class);
    User user2 = userDao2.findById(41);
    System.out.println(user2);
    sqlSession1.close();

    System.out.println(user1 == user2);
  }

}