第二天：利用mybatis实现对数据库的增删查改

鸟瞰图：必须一一对应上！

以下上代码
1、insert

<insert id="addUser" parameterType="com.song.pojo.User">
        insert into testweb.users (userName, password, sex, email)
        values (#{userName},#{password},#{sex},#{email})
    </insert>

2、delete

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

3、select

<select id="getUserList" resultType="com.song.pojo.User">
    select * from users
  </select>

4、update；懒得写了太简单了哈哈

5、测试

public class test {
    @Test
    public void test(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserDao userDao=sqlSession.getMapper(UserDao.class);
        List<User> userList = userDao.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }
    }
    @Test
    public void add(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserDao mapper = sqlSession.getMapper(UserDao.class);
        mapper.addUser(new User(5,"吴亦凡","123456","男","wyfqq.com"));
        sqlSession.commit();
        sqlSession.close();
    }
    @Test
    public void deldte(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserDao mapper = sqlSession.getMapper(UserDao.class);
        mapper.deleteUserByID(5);
        sqlSession.commit();
        sqlSession.close();
    }
}

重点：

增删改需要提交事务