前端：优惠劵领取界面（完成）

promotion/promotion-service-impl/src/main/java/cn/iocoder/mall/promotion/biz/dao/CouponCardMapper.java

@@ -15,6 +15,9 @@ public interface CouponCardMapper {
 
     Integer selectCountByPage(@Param("status") Integer status);
 
+    int selectCountByUserIdAndTemplateId(@Param("userId") Integer userId,
+                                         @Param("templateId") Integer templateId);
+
     void insert(CouponCardDO couponCardDO);
 
     int update(CouponCardDO couponCardDO);

promotion/promotion-service-impl/src/main/java/cn/iocoder/mall/promotion/biz/dao/CouponTemplateMapper.java

@@ -27,4 +27,6 @@ public interface CouponTemplateMapper {
 
     int update(CouponTemplateDO couponTemplate);
 
+    int updateStatFetchNumIncr(@Param("id") Integer id);
+
 }

promotion/promotion-service-impl/src/main/java/cn/iocoder/mall/promotion/biz/service/CouponServiceImpl.java

@@ -19,6 +19,7 @@ import cn.iocoder.mall.promotion.biz.dataobject.CouponCardDO;
 import cn.iocoder.mall.promotion.biz.dataobject.CouponTemplateDO;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import java.util.Calendar;
 import java.util.Date;
@@ -176,6 +177,7 @@ public class CouponServiceImpl implements CouponService {
     // ========== 优惠劵 ==========
 
     @Override
+    @Transactional
     public CommonResult<CouponCardBO> addCouponCard(Integer userId, Integer couponTemplateId) {
         // 校验 CouponCardTemplate 存在
         CouponTemplateDO template = couponTemplateMapper.selectById(couponTemplateId);
@@ -190,6 +192,19 @@ public class CouponServiceImpl implements CouponService {
         if (!CouponTemplateStatusEnum.ENABLE.getValue().equals(template.getStatus())) {
             return ServiceExceptionUtil.error(PromotionErrorCodeEnum.PRODUCT_TEMPLATE_STATUS_NOT_ENABLE.getCode());
         }
+        // 校验 CouponCardTemplate 是否到达可领取的上限
+        if (template.getStatFetchNum() > template.getTotal()) {
+            return ServiceExceptionUtil.error(PromotionErrorCodeEnum.PRODUCT_TEMPLATE_TOTAL_NOT_ENOUGH.getCode());
+        }
+        //  校验单人可领取优惠劵是否到达上限
+        if (couponCardMapper.selectCountByUserIdAndTemplateId(userId, couponTemplateId) > template.getQuota()) {
+            return ServiceExceptionUtil.error(PromotionErrorCodeEnum.PRODUCT_TEMPLATE_CARD_ADD_EXCEED_QUOTA.getCode());
+        }
+        // 增加优惠劵已领取量
+        int updateTemplateCount = couponTemplateMapper.updateStatFetchNumIncr(couponTemplateId);
+        if (updateTemplateCount == 0) { // 超过 CouponCardTemplate 发放量
+            return ServiceExceptionUtil.error(PromotionErrorCodeEnum.PRODUCT_TEMPLATE_CARD_ADD_EXCEED_QUOTA.getCode());
+        }
         // 创建优惠劵
         // 1. 基本信息 + 领取情况
         CouponCardDO card = new CouponCardDO()

promotion/promotion-service-impl/src/main/resources/mapper/CouponCardMapper.xml

@@ -56,6 +56,20 @@
         </where>
     </select>
 
+    <select id="selectCountByUserIdAndTemplateId" resultType="Integer">
+        SELECT
+            COUNT(1)
+        FROM coupon_card
+        <where>
+            <if test="userId != null">
+                AND user_id = #{userId}
+            </if>
+            <if test="templateId != null">
+                AND template_id = #{templateId}
+            </if>
+        </where>
+    </select>
+
     <insert id="insert" parameterType="CouponCardDO" useGeneratedKeys="true" keyColumn="id" keyProperty="id">
         INSERT INTO coupon_card (
           template_id, status, user_id, take_type,

promotion/promotion-service-impl/src/main/resources/mapper/CouponTemplateMapper.xml

@@ -149,4 +149,11 @@
         WHERE id = #{id}
     </update>
 
+    <update id="updateStatFetchNumIncr" parameterType="Integer">
+        UPDATE coupon_template
+        SET stat_fetch_Num = stat_fetch_Num + 1
+        WHERE id = #{id}
+        AND total > stat_fetch_Num
+    </update>
+
 </mapper>