fix

AutoTurnOver.DB/dc_auto_first_order_sku_dao.cs

@@ -29,7 +29,7 @@ namespace AutoTurnOver.DB
             {
                 throw new Exception("仓库编码必填");
             }
-            using (var conn = _connection)
+            using (var conn = MyMySqlConnection._connection)
             {
                 conn.Open();
                 using (var t = conn.BeginTransaction())