school/hiver-modules/hiver-mall/src/main/resources/mapper/MallCouponMapper.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="cc.hiver.mall.dao.mapper.MallCouponMapper">

    <resultMap id="couponMap" type="cc.hiver.mall.entity.MallCoupon">
        <id     column="id"             property="id"/>
        <result column="name"           property="name"/>
        <result column="issuer_type"    property="issuerType"/>
        <result column="issuer_id"      property="issuerId"/>
        <result column="apply_scene"    property="applyScene"/>
        <result column="type"           property="type"/>
        <result column="min_amount"     property="minAmount"/>
        <result column="discount_amount" property="discountAmount"/>
        <result column="total_count"    property="totalCount"/>
        <result column="remain_count"   property="remainCount"/>
        <result column="limit_per_user" property="limitPerUser"/>
        <result column="valid_type"     property="validType"/>
        <result column="valid_start_time" property="validStartTime"/>
        <result column="valid_end_time"   property="validEndTime"/>
        <result column="valid_days"     property="validDays"/>
        <result column="status"         property="status"/>
        <result column="region_id"      property="regionId"/>
    </resultMap>

    <sql id="selectCouponColumns">
        id,
        name,
        issuer_type,
        issuer_id,
        apply_scene,
        type,
        min_amount,
        discount_amount,
        total_count,
        remain_count,
        limit_per_user,
        valid_type,
        valid_start_time,
        valid_end_time,
        valid_days,
        status,
        region_id
    </sql>
    <update id="deductStock">
        UPDATE t_mall_coupon 
        SET remain_count = remain_count - 1 
        WHERE id = #{id} AND remain_count > 0 AND del_flag = 0
    </update>

    <!-- 分页查询-->
    <select id="selectPageVO" resultMap="couponMap">
        SELECT
        <include refid="selectCouponColumns"/>
        FROM
        t_mall_coupon
        <where>
            <!-- 示例：动态查询条件 -->
            <if test="q.name != null and q.name != ''">
                AND name LIKE CONCAT('%', #{q.name}, '%')
            </if>
            <if test="q.status != null">
                AND status = #{q.status}
            </if>
            <if test="q.type != null">
                AND type = #{q.type}
            </if>
            <if test="q.issuerType != null">
                AND issuer_type = #{q.issuerType}
            </if>
            <if test="q.applyScene != null">
                AND apply_scene = #{applyScene}
            </if>
            <if test="q.regionId != null and q.regionId != ''">
                AND region_id = #{q.regionId}
            </if>
        </where>
        ORDER BY id DESC
    </select>
</mapper>