Code optimization

Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlBlueCopy.cs

@@ -91,7 +91,6 @@ namespace SqlSugar
                 {
                     File.Delete(fileName);
                 }
-                conn.Close();
             }
             catch (MySqlException ex)
             {
@@ -99,7 +98,7 @@ namespace SqlSugar
             }
             finally
             {
-                this.Context.Ado.Close();
+                CloseDb();
             }
             return IsBulkLoad; ;
         }
@@ -109,6 +108,15 @@ namespace SqlSugar
             return Task.FromResult(ExecuteBlueCopy());
         }
 
+
+        private void CloseDb()
+        {
+            if (this.Context.CurrentConnectionConfig.IsAutoCloseConnection && this.Context.Ado.Transaction == null)
+            {
+                this.Context.Ado.Connection.Close();
+            }
+        }
+
         /// <summary>
         ///DataTable to CSV
         /// </summary>