yhlxj/netflix-dao/src/main/resources/mapper/OrderMasterDonMapper.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.cyksj.mapper.order.OrderMasterDonMapper">

    <select id="getOrderPayTitle" resultType="java.lang.String">
        select group_concat(g.title)
        from (select distinct goods_id from order_don where m_oid = #{mOid} o)
                 left join goods_don g on g.id = o.goods_id
    </select>
</mapper>