Gozero sqlgen patch (#119)

* merge upstream

* optimize insert logic

* reactor functions

tools/goctl/model/sql/example/sql/user.sql

@@ -10,6 +10,6 @@ CREATE TABLE `user` (
   `update_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   PRIMARY KEY (`id`),
   UNIQUE KEY `name_index` (`name`),
-  KEY `mobile_index` (`mobile`)
+  UNIQUE KEY `mobile_index` (`mobile`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;