gold-java/src/main/resources/mapper/AdminMapper.xml

<?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.example.demo.mapper.AdminMapper">

    <select id="getAdmin" resultType="com.example.demo.domain.entity.Admin">
        select * from admin
        where account=#{account}
    </select>
    <select id="selectByName" resultType="com.example.demo.domain.entity.Admin">
        select * from admin
        where account= #{account}
    </select>
    <select id="getId" resultType="java.lang.Integer">
        select id from admin
        where account=#{account}
    </select>
</mapper>