二、MyBaties-增删查改

一、简单的增删查改

1.添加

<insert id="insertUser">
        insert into user values (null,"cc","123445",20);
</insert>

2.删除

<!--    int deleteUser();-->
    <delete id="deleteUser">
        delete  from user where id=3;
    </delete>

3.修改

<!--    void updateUser();-->
    <update id="updateUser">
        update user set username='aa' where id=4;
    </update>

4.查询

查询功能的标签必须设置resultType或resultMap

• resultType:设置默认的映射关系
• resultmap:设置自定义的映射关系

<!--    User getUserById();-->
    <select id="getUserById" resultType="com.mybatis.Bean.User">
        select * from user where id = 3;
    </select>