修改领取优惠卷可能会超发的情况

app/Controller/CouponController.php

@@ -100,10 +100,17 @@ class CouponController extends BaseController
         $test        = $this->request->input("test", 0);
 
         $ids     = explode(',', $ids);
-        $cps     = Coupon::whereIn('id', $ids)->get();
         $now     = time();
         $success = [];
         $fail    = [];
+
+
+        Db::transaction(function () use ($ids,$receiveType,$userId,&$success,&$fail,$test) {
+            //读写锁，完全控制，性能底
+            $cps     = Coupon::whereIn('id', $ids)->lockForUpdate()->get();
+            //写锁，可能在高并发下，读取到脏数据，写入可能有超发情况
+            //$cps     = Coupon::whereIn('id', $ids)->sharedLock()->get();
+
             foreach ($cps as $key => $cp) {
                 $crt = CouponUserRecType::where(
                     [
@@ -140,6 +147,7 @@ class CouponController extends BaseController
                 }
 
             }
+        });
 
         return $this->success([
             'success' => $success,