src/main/resources/mapper/UserDao.xml

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<?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="cn.hxh.files.mapper.UserDao">

    <resultMap type="cn.hxh.files.pojo.User" id="UserMap">
        <result property="id" column="id" jdbcType="INTEGER"/>
        <result property="username" column="username" jdbcType="VARCHAR"/>
        <result property="password" column="password" jdbcType="VARCHAR"/>
    </resultMap>

    <select id="query" resultType="cn.hxh.files.pojo.User">
        select * from userfiles.user where username = #{username} and password = #{password}
    </select>

    <insert id="addUser" parameterType="cn.hxh.files.pojo.User">
        insert into user (username,password) values (#{username},#{password})
    </insert>
</mapper>