gold-java/src/main/resources/mapper/GeneralMapper.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.GeneralMapper">

    <select id="getMarket" resultType="java.lang.String">
            select DISTINCT market from user
    </select>
    <select id="getPlatform" resultType="java.lang.String">
        select DISTINCT pay_platform from user_gold_record
    </select>
    <select id="getGoods" resultType="java.lang.String">
        select DISTINCT goods_name from user_gold_record
    </select>
</mapper>