src/main/resources/mapper/xml/RequestResourcesMapper.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.pt5.pthouduan.mapper.RequestResourcesMapper">

    <!-- 创建求助帖 -->
    <insert id="save" parameterType="com.pt5.pthouduan.entity.request_resources">
        INSERT INTO request_resources (userid, loaduser, name, plot, money, year, country, requesttime, photo)
        VALUES (#{userid}, #{loaduser}, #{name}, #{plot}, #{money}, #{year}, #{country}, #{requesttime}, #{photo})
    </insert>

    <!-- 修改求助帖金额 -->
    <update id="updateMoney">
        UPDATE request_resources
        SET money = #{money}
        WHERE requestid = #{requestid}
    </update>

    <!-- 根据 requestid 更新 torrentid -->
    <update id="updateTorrentid">
        UPDATE request_resources
        SET torrentid = #{torrentid}
        WHERE requestid = #{requestid}
    </update>

    <!-- 批量更新 loaduser -->
    <update id="updateLoaduserByName">
        UPDATE request_resources
        SET loaduser = #{loaduser}
        WHERE name = #{name}
    </update>

    <!-- 根据名称查询求助帖 -->
    <select id="selectByName" resultType="com.pt5.pthouduan.entity.request_resources">
        SELECT * FROM request_resources
        WHERE name = #{name}
        ORDER BY requesttime DESC
    </select>

    <!-- 根据 userid 查询求助帖 -->
    <select id="selectByUserid" resultType="com.pt5.pthouduan.entity.request_resources">
        SELECT * FROM request_resources
        WHERE userid = #{userid}
        ORDER BY requesttime DESC
    </select>

    <!-- 根据 loaduser 查询求助帖 -->
    <select id="selectByLoaduser" resultType="com.pt5.pthouduan.entity.request_resources">
        SELECT * FROM request_resources
        WHERE loaduser = #{loaduser}
        ORDER BY requesttime DESC
    </select>

    <!-- 统计某名称的总金额 -->
    <select id="sumMoneyByName" resultType="java.lang.Integer">
        SELECT SUM(money) FROM request_resources
        WHERE name = #{name}
    </select>

    <!-- 查询所有求助帖 -->
    <select id="selectAllRequests" resultType="com.pt5.pthouduan.entity.request_resources">
        SELECT * FROM request_resources
        ORDER BY requesttime DESC
    </select>

    <!-- 根据 requestid 查询单条记录 -->
    <select id="selectByRequestid" resultType="com.pt5.pthouduan.entity.request_resources">
        SELECT * FROM request_resources
        WHERE requestid = #{requestid}
    </select>

    <!-- 根据 userid + name + plot 查询唯一记录 -->
    <select id="findByUseridNamePlot" resultType="com.pt5.pthouduan.entity.request_resources">
        SELECT * FROM request_resources
        WHERE userid = #{userid} AND name = #{name} AND plot = #{plot}
            LIMIT 1
    </select>

</mapper>