1、项目目录

可以查看上一篇文章，这里不同的就是IUserDao.xml里面配置的sql语句的信息不同和测试的方法不同。

2、IUserDao.xml配置文件如下：

<?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.mybatis.dao.IUserDao">
<!--    保存用户-->
    <insert id="saveUser" parameterType="com.mybatis.domain.User" >
        <!--保存后返回id值-->
        <selectKey keyProperty="id" keyColumn="id" resultType="int" order="AFTER">
            select last_insert_id();
        </selectKey>
        insert into users(username,address,sex,birthday)values (#{username},#{address},#{sex},#{birthday});
    </insert>
    <!--    模糊查询-->
    <select id="findByName" parameterType="string" resultType="com.mybatis.domain.User">
        <!--select * from users where username like "%${value}%";-->
        select * from users where username like #{username};
    </select>
<!--    查询总用户数-->
    <select id="findTotalUser" resultType="int">
        select count(id) from users;
    </select>
</mapper>

3、MybatisTest测试类

package com.mybatis.test;

import com.mybatis.dao.IUserDao;
import com.mybatis.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.List;

public class MybatisTest {
    private InputStream  in;
    private SqlSession session;
    private IUserDao userDao;

    @Before
    public void init() throws Exception {
        this.in = Resources.getResourceAsStream("SqlMapConfig.xml");
        SqlSessionFactoryBuilder factoryBuilder = new SqlSessionFactoryBuilder();
        System.out.println(in);
        SqlSessionFactory factory = factoryBuilder.build(in);
//        this.session = factory.openSession(true);
        this.session = factory.openSession();
        this.userDao = session.getMapper(IUserDao.class);
    }
    @After
    public void destory() throws IOException {
        session.commit();
        this.in.close();
        this.session.close();
    }
   @Test
    public void findByName(){
        List<User> users = userDao.findByName("%王%");
        for (User user:users){
            System.out.println(user);
        }
    }
    @Test
    public void findCount(){
        int count = userDao.findTotalUser();
        System.out.println(count);
    }
    @Test
    public void testSave() throws Exception {
        User user = new User();
        user.setUsername("admin");
        user.setBirthday(new Date());
        user.setAddress("背景");
        user.setSex("男");
        System.out.println(user);
        userDao.saveUser(user);
        System.out.println(user);
    }
}