分頁

1.使用Limit分頁

語法：SELECT * from user limit startIndex,pageSize; SELECT * from user limit 3; #[0,n]

1.編寫接口

//分頁查詢List<User> getUserByLimit(Map<String,Integer> map);

2.mapper中配置

<select id="getUserByLimit" parameterType="map" resultType="User">select * from mybatis.user limit #{startIndex},#{pageSize}</select>

3.測試

@Testpublic void getUserByLimit(){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> users = mapper.getUserByLimit(map);for (User user : users) {System.out.println(user);}sqlSession.close();}

2. RowBounds分頁

編寫接口

//分頁2 List<User> getUserByRowBounds();

mapper.xml

<!--分頁2--> <select id="getUserByRowBounds" resultType="User">select * from mybatis.user </select>

測試

@Test public void getUserByRowBounds(){ SqlSession sqlSession = MybatisUtils.getSqlSession();//RowBounds實現 RowBounds rowBounds = new RowBounds(0, 2);//通過Java代碼層面實現分頁 List<User> userList = sqlSession.selectList("com.kuang.dao.UserMapper.getUserByRowBounds",null,rowBounds);for (User user : userList) {System.out.println(user);}sqlSession.close();}

3. 第三方插件PageHelper

官網：https://pagehelper.github.io/

無論用什么方法，底層都是sql語句limit實現

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