07.分页

Posted 2021-02-17 thetree

07.分页

使用limita分页

select * from t_user limit startIndex,pageSize;

使用mybatis实现分页，核心sql

1. 接口

   List<User> getUserLimit(Map<String,Integer> map);
   

2. mapper.xml

   <select id="getUserLimit" parameterType="map" resultMap="UserMap" >
   	select * from t_user limit #{startIndex},#{pageSize}
   </select>
   

3. 测试

   public void getUserLimit(){
           SqlSession sqlSession = MybatisUtils.getSqlSession();
           UserMapper mapper = sqlSession.getMapper(UserMapper.class);
           Map<String,Integer> map = new HashMap<String, Integer>();
           map.put("startIndex",0);
           map.put("pageSize",2);
           List<User> userList = mapper.getUserLimit(map);
           for (User user : userList) {
               System.out.println(user);
           }
           sqlSession.close();
       }
   

使用RowBounds实现分页，不再使用sql分页

1. 接口

   List<User> getUserByRowBounds();
   

2. mapper.xml

   <select id="getUserByRowBounds" resultMap="UserMap" >
   	select * from t_user
   </select>
   

3. 测试

   public void getUserByRowBounds(){
           SqlSession sqlSession = MybatisUtils.getSqlSession();
           RowBounds rowBounds = new RowBounds(0,3);
           List<User> User = sqlSession.selectList("com.believe.mapper.UserMapper.getUserByRowBounds",null,rowBounds);
           for (User user : User) {
               System.out.println(user);
           }
           sqlSession.close();
       }