Mybatis之分页

分页

Limit 分页

语法：

SELECT * from user limit startIndex,pageSize;
SELECT * from user limit 0,2;

实体类 UserMapper.java

package com.yz.dao;

import com.hou.pojo.User;

import java.util.List;
import java.util.Map;

public interface UserMapper {

    //根据id查询用户
    User getUserById(int id);

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

}

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--namespace绑定一个对应的mapper接口-->
<mapper namespace="com.hou.dao.UserMapper">

    <select id="getUserById" resultMap="UserMap"
    parameterType="int">
        select * from mybatis.user where id = #{id}
    </select>

    <!--结果集映射-->
    <resultMap id="UserMap" type="User">
        <!--colunm 数据库中的字段，property实体中的属性-->
        <!--<result column="id" property="id"></result>-->
        <!--<result column="name" property="name"></result>-->
        <result column="pwd" property="password"></result>
    </resultMap>

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

</mapper>

test.java(测试类）

@Test
public void getByLimit(){
    SqlSession sqlSession = MybatisUtils.getSqlSession();
    UserMapper mapper = sqlSession.getMapper(UserMapper.class);
    Map<String, Integer> map = new HashMap<String, Integer>();
    map.put("startIndex", 1);
    map.put("pageSize", 2);
    List<User> userList = mapper.getUserByLimit(map);

    for(User user:userList){
        System.out.println(user);
    }

    sqlSession.close();
}

RowBounds分页

@Test
public void getUserByRow(){
    SqlSession sqlSession = MybatisUtils.getSqlSession();
    //RowBounds实现
    RowBounds rowBounds = new RowBounds(1, 2);

    //通过java代码层面
    List<User> userList = sqlSession.selectList
        ("com.hou.dao.UserMapper.getUserByRowBounds",
         null,rowBounds);

    for (User user : userList) {
        System.out.println(user);
    }

    sqlSession.close();
}

3. 分页插件
pageHelper
https://pagehelper.github.io/