wechatbak/wjj-core/target/classes/mybatis/CreditsExchangeMapper.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.demo.wjj.mapper.CreditsExchangeMapper">
    <select id="selectByUserId" resultType="com.demo.wjj.po.CreditsExchange">
        select c.id              id,
               c.cash_diposit    cashDiposit,
               c.price           price
        from tb_credits_exchange c
        where user_id = #{userId}
    </select>
</mapper>