SpringBootLearning/ajaxSpringBoot/src/main/resources/mappers/UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
        "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">

<mapper namespace="org.example.mapper.UserMapper">

    <!--用户添加-->
    <!-- Integer insert(User user) -->
    <insert id="insert" useGeneratedKeys="true"
            keyProperty="id">
        INSERT INTO users(
        id,username,
        password
        )VALUES(
        #{id},#{username},
        #{password}
        )
    </insert>

    <!--查找用户名-->
    <!--User findByUsername(String username)-->
    <select id="findByUsername" resultType="org.example.entity.User">
        SELECT
        id,username,
        password
        FROM
        users
        WHERE
        username=#{username}
    </select>

    <!-- id查找用户 -->
    <!-- User findById(Integer id) -->
    <select id="findById" resultType="org.example.entity.User">
        SELECT
        id,username,
        password
        FROM
        users
        WHERE
        id=#{id}
    </select>


</mapper>