9.20

mybatis的应用能大大简化我们编写程序的代码并提升效率。

package com.aurora.mybatis.test;

import com.aurora.mybatis.mapper.ParameterMapper;
import com.aurora.mybatis.pojo.User;
import com.aurora.mybatis.utils.SqlSessionUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

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


public class ParameterMapperTest {

    @Test
    public void testGetAllUser(){
        SqlSession sqlSession = SqlSessionUtils.getSqlSession();
        ParameterMapper mapper = sqlSession.getMapper(ParameterMapper.class);
        List<User> list = mapper.getAllUser();
        list.forEach(user -> System.out.println(user));
    }
    @Test
    public void testGetUserByUsername(){
        SqlSession sqlSession = SqlSessionUtils.getSqlSession();
        ParameterMapper mapper = sqlSession.getMapper(ParameterMapper.class);
        User admin = mapper.getUserByUsername("admin");
        System.out.println(admin);
    }
    @Test
    public void testCheckLogin(){
        SqlSession sqlSession = SqlSessionUtils.getSqlSession();
        ParameterMapper mapper = sqlSession.getMapper(ParameterMapper.class);
        User user = mapper.checkLogin("admin","123456");
        System.out.println(user);
    }
    @Test
    public void testCheckLoginByMap(){
        SqlSession sqlSession = SqlSessionUtils.getSqlSession();
        ParameterMapper mapper = sqlSession.getMapper(ParameterMapper.class);
        Map<String , Object> map = new HashMap<>();
        map.put("username","admin");
        map.put("password","123456");
        User user = mapper.checkLoginByMap(map);
        System.out.println(user);
    }
    @Test
    public void testInsertUser(){
        SqlSession sqlSession = SqlSessionUtils.getSqlSession();
        ParameterMapper mapper = sqlSession.getMapper(ParameterMapper.class);
        int result = mapper.insertUser(new User(null, "李四", "123", 23, "男", "123@qq.com"));
        System.out.println(result);
    }
    @Test
    public void testCheckLoginByParam(){
        SqlSession sqlSession = SqlSessionUtils.getSqlSession();
        ParameterMapper mapper = sqlSession.getMapper(ParameterMapper.class);
        User user = mapper.checkLoginByParam("admin","123456");
        System.out.println(user);
    }
}

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">
<mapper namespace="com.aurora.mybatis.mapper.ParameterMapper">
    <!--List<User> getAllUser();-->
    <select id="getAllUser" resultType="User">
        select * from t_user
    </select>
<!--    User getUserByUsername(String username);-->
    <select id="getUserByUsername" resultType="User">
        select * from t_user where username = #{username}
    </select>
<!--    User checkLogin(String username,String password);-->
    <!-- arg0 arg1 param1 param2-->
    <select id="checkLogin" resultType="User">
        select * from t_user where username= #{arg0} and password = #{arg1}
    </select>
<!--    User checkLoginByMap(Map<String, Objects> map);-->
    <select id="checkLoginByMap" resultType="User">
        select * from t_user where username= #{username} and password = #{password}
    </select>
<!--    int insertUser(User user);-->
    <insert id="insertUser">
        insert into t_user values(null,#{username},#{password},#{age},#{sex},#{email})
    </insert>
<!--User checkLoginByParam(@Param("username") String username, @Param("password") String password);-->
    <select id="checkLoginByParam" resultType="User">
        select * from t_user where username= #{username} and password = #{password}
    </select>
</mapper>