gold-java/src/main/resources/mapper/MarketMapper.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.MarketMapper">
    <select id="getMarket" resultType="com.example.demo.domain.entity.Market">
        select * from market
    </select>
</mapper>