XYSH/MessageDao.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.forum.dao.MessageDao">



    <resultMap id="messages" type="message">
        <id property="id" column="id"/>
        <result property="content" column="content"/>
        <result property="name" column="name"/>
        <result property="msg_avatar" column="msg_avatar"/>
        <result property="createTime" column="create_time"/>

        <collection property="replies" ofType="reply">
            <id property="id" column="rid"/>
            <result property="content" column="con"/>
<!--            <result property="reply_name" column="reply_name"/>-->
            <result property="names" column="names"/>
            <result property="createTime" column="ctime"/>
            <result property="avatar" column="avatar"/>
            <result property="mes_id" column="mes_id"/>
        </collection>
    </resultMap>
    <delete id="deleteById">
        delete from message where id=#{id}
    </delete>


    <select id="findAllMessage" resultMap="messages">
           select m.*,
           r.id rid,
        r.content con,
        r.names names,
        r.create_time ctime,
        r.avatar,
        r.mes_id
         from message m left join reply r on r.mes_id=m.id
           order by m.create_time desc
    </select>
    <select id="getIndexMessage" resultMap="messages">
           select m.*
            from message m
            order by m.create_time desc
            limit 0,6




    </select>
    <select id="findAll" resultType="com.forum.entity.Message">
       select id,content,name, create_time from  message
    </select>

    <insert id="saveMessage" parameterType="message">
        insert into message (content,name,create_time,msg_avatar)
        values (#{content},#{name},#{createTime},#{msg_avatar})
    </insert>

    <insert id="saveReplyMessage" parameterType="reply">
        insert into reply (content,names,create_time,mes_id,avatar)
        values (#{content},#{names},#{createTime},#{mes_id},#{avatar})
    </insert>

</mapper>