trade：完善砍价的下单流程

yudao-module-mall/yudao-module-promotion-biz/src/main/java/cn/iocoder/yudao/module/promotion/api/bargain/BargainRecordApiImpl.java

@@ -1,6 +1,5 @@
 package cn.iocoder.yudao.module.promotion.api.bargain;
 
-import cn.iocoder.yudao.module.promotion.api.bargain.dto.BargainRecordCreateReqDTO;
 import cn.iocoder.yudao.module.promotion.api.bargain.dto.BargainValidateJoinRespDTO;
 import cn.iocoder.yudao.module.promotion.service.bargain.BargainRecordService;
 import org.springframework.stereotype.Service;
@@ -18,13 +17,14 @@ public class BargainRecordApiImpl implements BargainRecordApi {
     @Resource
     private BargainRecordService bargainRecordService;
 
-    @Override
-    public void createBargainRecord(BargainRecordCreateReqDTO reqDTO) {
-    }
-
     @Override
     public BargainValidateJoinRespDTO validateJoinBargain(Long userId, Long bargainRecordId, Long skuId) {
         return bargainRecordService.validateJoinBargain(userId, bargainRecordId, skuId);
     }
 
+    @Override
+    public void updateBargainRecordOrderId(Long id, Long orderId) {
+        bargainRecordService.updateBargainRecordOrderId(id, orderId);
+    }
+
 }

yudao-module-mall/yudao-module-promotion-biz/src/main/java/cn/iocoder/yudao/module/promotion/dal/mysql/bargain/BargainActivityMapper.java

@@ -39,6 +39,14 @@ public interface BargainActivityMapper extends BaseMapperX<BargainActivityDO> {
      * @return 影响的行数
      */
     default int updateStock(Long id, int count) {
+        // 情况一：增加库存
+        if (count > 0) {
+            return update(null, new LambdaUpdateWrapper<BargainActivityDO>()
+                    .eq(BargainActivityDO::getId, id)
+                    .setSql("stock = stock + " + count));
+        }
+        // 情况二：扣减库存
+        count = -count; // 取正
         return update(null, new LambdaUpdateWrapper<BargainActivityDO>()
                 .eq(BargainActivityDO::getId, id)
                 .ge(BargainActivityDO::getStock, count)

yudao-module-mall/yudao-module-promotion-biz/src/main/java/cn/iocoder/yudao/module/promotion/dal/mysql/bargain/BargainRecordMapper.java

@@ -93,4 +93,18 @@ public interface BargainRecordMapper extends BaseMapperX<BargainRecordDO> {
                 .last("LIMIT " + count));
     }
 
+    /**
+     * 更新砍价的订单编号，前提是 orderId 原本是空的
+     *
+     * @param id 砍价记录编号
+     * @param orderId 订单编号
+     * @return 更新数量
+     */
+    default int updateOrderIdById(Long id, Long orderId) {
+        return update(new BargainRecordDO().setOrderId(orderId),
+                new LambdaQueryWrapper<>(BargainRecordDO.class)
+                        .eq(BargainRecordDO::getId, id)
+                        .isNull(BargainRecordDO::getOrderId));
+    }
+
 }

yudao-module-mall/yudao-module-promotion-biz/src/main/java/cn/iocoder/yudao/module/promotion/service/bargain/BargainActivityService.java

@@ -36,6 +36,8 @@ public interface BargainActivityService {
     /**
      * 更新砍价活动库存
      *
+     * 如果更新失败（库存不足），则抛出业务异常
+     *
      * @param id    砍价活动编号
      * @param count 购买数量
      */

yudao-module-mall/yudao-module-promotion-biz/src/main/java/cn/iocoder/yudao/module/promotion/service/bargain/BargainActivityServiceImpl.java

@@ -83,16 +83,7 @@ public class BargainActivityServiceImpl implements BargainActivityService {
 
     @Override
     public void updateBargainActivityStock(Long id, Integer count) {
-        // 查询砍价活动
-        BargainActivityDO activity = getBargainActivity(id);
-        if (activity == null) {
-            throw exception(BARGAIN_ACTIVITY_NOT_EXISTS);
-        }
-        if (count > activity.getStock()) {
-            throw exception(BARGAIN_ACTIVITY_STOCK_NOT_ENOUGH);
-        }
-
-        // 更新砍价库存
+        // 更新库存。如果更新失败，则抛出异常
         int updateCount = bargainActivityMapper.updateStock(id, count);
         if (updateCount == 0) {
             throw exception(BARGAIN_ACTIVITY_STOCK_NOT_ENOUGH);

yudao-module-mall/yudao-module-promotion-biz/src/main/java/cn/iocoder/yudao/module/promotion/service/bargain/BargainRecordService.java

@@ -55,6 +55,16 @@ public interface BargainRecordService {
      */
     BargainValidateJoinRespDTO validateJoinBargain(Long userId, Long bargainRecordId, Long skuId);
 
+    /**
+     * 更新砍价记录的订单编号
+     *
+     * 在砍价成功后，用户发起订单后，会记录该订单编号
+     *
+     * @param id     砍价记录编号
+     * @param orderId 订单编号
+     */
+    void updateBargainRecordOrderId(Long id, Long orderId);
+
     /**
      * 获得砍价记录
      *

yudao-module-mall/yudao-module-promotion-biz/src/main/java/cn/iocoder/yudao/module/promotion/service/bargain/BargainRecordServiceImpl.java

@@ -13,6 +13,7 @@ import cn.iocoder.yudao.module.promotion.dal.dataobject.bargain.BargainRecordDO;
 import cn.iocoder.yudao.module.promotion.dal.mysql.bargain.BargainRecordMapper;
 import cn.iocoder.yudao.module.promotion.enums.bargain.BargainRecordStatusEnum;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 import org.springframework.validation.annotation.Validated;
 
 import javax.annotation.Nullable;
@@ -42,7 +43,7 @@ public class BargainRecordServiceImpl implements BargainRecordService {
 
     @Override
     public Long createBargainRecord(Long userId, AppBargainRecordCreateReqVO reqVO) {
-        // 1. 校验砍价活动
+        // 1. 校验砍价活动（包括库存）
         BargainActivityDO activity = bargainActivityService.validateBargainActivityCanJoin(reqVO.getActivityId());
 
         // 2.1 校验当前是否已经有参与中的砍价活动
@@ -77,23 +78,37 @@ public class BargainRecordServiceImpl implements BargainRecordService {
 
     @Override
     public BargainValidateJoinRespDTO validateJoinBargain(Long userId, Long bargainRecordId, Long skuId) {
-        // 1.1 拼团记录不存在
+        // 1.1 砍价记录不存在
         BargainRecordDO record = bargainRecordMapper.selectByIdAndUserId(bargainRecordId, userId);
         if (record == null) {
             throw exception(BARGAIN_RECORD_NOT_EXISTS);
         }
-        // 1.2 拼团记录未在进行中
-        if (ObjUtil.notEqual(record.getStatus(), BargainRecordStatusEnum.IN_PROGRESS)) {
+        // 1.2 砍价记录未在进行中
+        if (ObjUtil.notEqual(record.getStatus(), BargainRecordStatusEnum.SUCCESS.getStatus())) {
             throw exception(BARGAIN_JOIN_RECORD_NOT_SUCCESS);
         }
+        // 1.3 砍价记录已经下单
+        if (record.getOrderId() != null) {
+            throw exception(BARGAIN_JOIN_RECORD_ALREADY_ORDER);
+        }
 
-        // 2. 校验砍价活动
+        // 2.1 校验砍价活动（包括库存）
         BargainActivityDO activity = bargainActivityService.validateBargainActivityCanJoin(record.getActivityId());
         Assert.isTrue(Objects.equals(skuId, activity.getSkuId()), "砍价商品不匹配"); // 防御性校验
         return new BargainValidateJoinRespDTO().setActivityId(activity.getId()).setName(activity.getName())
                 .setBargainPrice(record.getBargainPrice());
     }
 
+    @Override
+    @Transactional(rollbackFor = Exception.class)
+    public void updateBargainRecordOrderId(Long id, Long orderId) {
+        // 更新失败，说明已经下单
+        int updateCount = bargainRecordMapper.updateOrderIdById(id, orderId);
+        if (updateCount == 0) {
+            throw exception(BARGAIN_JOIN_RECORD_ALREADY_ORDER);
+        }
+    }
+
     @Override
     public BargainRecordDO getBargainRecord(Long id) {
         return bargainRecordMapper.selectById(id);