派工生成打印模板的时候 先校验生成的流水号是不是已存在，存在则继续生成

services/schedule/SchedTask.Ctrl.go

@@ -345,11 +345,27 @@ func (tasksrv *TaskSrv) ReleaseSerialOrder(relQty int, releaseId string) (err er
 		// 写入打印条码的逻辑
 		snr := new(models.Snrtab)
 		snr.Finr = common.PlantNr
-		printID, err := snr.GetNextSnrWithSession(session, "Printer")
-		if err != nil {
-			innerLog.Error("ReleaseSerialOrder 更新工单工艺详细步骤状态失败, error:"+err.Error()+" serialOrderId:"+serialOrderStatus.SerialOrderId, "release id:"+releaseId)
-			_ = session.Rollback()
-			return grmi.NewBusinessError("获取打印条码流水号失败, error:" + err.Error())
+		var next bool
+		var printID string
+		for !next {
+			printID, err = snr.GetNextSnrWithSession(session, "Printer")
+			if err != nil {
+				innerLog.Error("ReleaseSerialOrder 更新工单工艺详细步骤状态失败, error:"+err.Error()+" serialOrderId:"+serialOrderStatus.SerialOrderId, "release id:"+releaseId)
+				_ = session.Rollback()
+				return grmi.NewBusinessError("获取打印条码流水号失败, error:" + err.Error())
+			}
+			existPrintHead, err := printHeadDao.SelectOne(printID)
+			if err != nil {
+				innerLog.Error("ReleaseSerialOrder 获取失败, error:"+err.Error()+" serialOrderId:"+serialOrderStatus.SerialOrderId, "release id:"+releaseId)
+				_ = session.Rollback()
+				return grmi.NewBusinessError("获取打印条码流水号失败, error:" + err.Error())
+			}
+			if existPrintHead != nil {
+				continue
+			} else {
+				next = true
+				break
+			}
 		}
 		article, exist := artMap[serialOrder.ArtId]
 		if !exist {