Mybatis XML配置和session.方式增删改查

环境搭建参考上一章，本节内容通过更新userMapper.xml和test测试类实现增删改查

1、userMapper.xml代码

<?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="javastudy.UserMapper">
    <select id="selectUser" resultType="javastudy.User">
        select * from user where id = #{id}
    </select>
    <select id="selectAll" resultType="javastudy.User">
        select * from user
    </select>
    <insert id="addUser" parameterType="javastudy.User">
    	insert into user (userName,userPwd) values (#{userName},#{userPwd})
    </insert>
    <update id="updateUser" parameterType="javastudy.User">
    	update user set userName=#{userName},userPwd=#{userPwd} where id=#{id}
    </update>
    <delete id="deleteUser" parameterType="int">
    	delete from user where id=#{id} 
    </delete>
</mapper>

2、mybatis的主配置文件mybatis-config.xml 中需要配置

<mappers>  
    <mapper resource="javastudy/userMapper.xml"/>
    </mappers> 

3、user 实体做set和get

4、test测试类代码

package test;

import java.io.IOException;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import javastudy.User;
import utility.MyBatisUtils;
public class MyTest {
	@Test
	public void testSelect() throws IOException {
		SqlSession session=MyBatisUtils.openSession();
		String statement="javastudy.UserMapper.selectUser"; //确定sql语句
		User user=session.selectOne(statement,1);//返回一条记录，返回一条对象
		System.out.println(user);
		session.close();
	}
	@Test
	public void testSelectAll() throws IOException {
		SqlSession session=MyBatisUtils.openSession();
		String statement="javastudy.UserMapper.selectAll"; 
		List<User> list=session.selectList(statement);
		System.out.println(list);
		session.close();
	}
	@Test
	public void testInsert() throws IOException {
		SqlSession session=MyBatisUtils.openSession();
		String statement="javastudy.UserMapper.addUser"; 
		User user=new User();
		user.setUserName("zhang");
		user.setUserPwd("987654");
		session.insert(statement, user);
		session.commit();
		session.close();
	}
	@Test
	public void testUpdate() throws IOException {
		SqlSession session=MyBatisUtils.openSession();
		String statement="javastudy.UserMapper.updateUser"; 
		User user=new User();
		user.setId(3);
		user.setUserName("王3");
		user.setUserPwd("00000");
		session.update(statement, user);
		session.commit();
		session.close();
	}
	@Test
	public void testDelete() throws IOException {
		SqlSession session=MyBatisUtils.openSession();
		String statement="javastudy.UserMapper.deleteUser"; 
		session.delete(statement,3);
		session.commit();
		session.close();
	}
	
}