Mybatis学习笔记-CURD（基于配置文件的方式）

public class User {
private int id;
private String username;
private int age;
//...
}

<?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.test02.userMapper">
<!--
CRUD操作
-->
<insert id="addUser" parameterType="com.mybatis.test02.User">
insert into users(username, age) values(#{username}, #{age})
</insert>

<delete id="deleteUser" parameterType="int">
delete from users where id = #{id}
</delete>

<update id="updateUser" parameterType="com.mybatis.test02.User">
update users set username = #{username}, age = #{age} where id = #{id}
</update>

<select id="getUser" parameterType="int" resultType="com.mybatis.test02.User">
select * from users where id=#{id}
</select>

<select id="getAllUsers" resultType="com.mybatis.test02.User">
select * from users
</select>
</mapper>

public class MybatisUtil {
public static SqlSessionFactory getFactory() {
String resource = "conf.xml";
InputStream inputStream = Test.class.getClassLoader()	.getResourceAsStream(resource);
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
return factory;
}
}

@Test
public void testAdd() {
SqlSessionFactory factory = MybatisUtil.getFactory();
SqlSession session = factory.openSession(true);//设置成自动提交
User user2 = new User();
user2.setUsername("ssdd");
user2.setAge(22);
String s = "com.mybatis.test02.userMapper.addUser";
int insert = session.insert(s, user2);//受影响记录的条数
//session.commit();
System.out.println(insert);
session.close();
}

@Test
public void testDelete() {
SqlSessionFactory factory = MybatisUtil.getFactory();
SqlSession session = factory.openSession(true);//设置成自动提交
String s = "com.mybatis.test02.userMapper.deleteUser";
int delete = session.delete(s, 1);
//session.commit();
System.out.println(delete);
session.close();
}

//updateUser
@Test
public void testUpdate() {
SqlSessionFactory factory = MybatisUtil.getFactory();
SqlSession session = factory.openSession(true);
String s = "com.mybatis.test02.userMapper.updateUser";
User user = new User();
user.setId(3);
user.setUsername("umgsai");
user.setAge(24);
int update = session.update(s, user);
System.out.println(update);
session.close();
}

@Test
public void testSelect(){
SqlSessionFactory factory = MybatisUtil.getFactory();
SqlSession session = factory.openSession(true);
String s = "com.mybatis.test02.userMapper.getUser";
User user = session.selectOne(s, 5);
System.out.println(user);
session.close();
}

@Test
public void testSelectAll() {
SqlSessionFactory factory = MybatisUtil.getFactory();
SqlSession session = factory.openSession(true);
String s = "com.mybatis.test02.userMapper.getAllUsers";
List<User>users = session.selectList(s);
session.close();
System.out.println(users);
}