diff --git a/infra/driver/driver.go b/infra/driver/driver.go
index 649bd64..2bf80e7 100644
--- a/infra/driver/driver.go
+++ b/infra/driver/driver.go
@@ -8,7 +8,7 @@ import (
 
 func InitDriver(config model.DB) error {
 	switch config.DBType {
-	case "mssql":
+	case model.ENGINE_TYPE_SQLSERVER:
 		return InitMssqlDriver(config)
 	}
 	return grmi.NewBusinessError("不支持该类型的数据库")
@@ -17,6 +17,6 @@ func InitDriver(config model.DB) error {
 func DestroyDriver(id int)  {
 	global.ETLDriver.Lock.Lock()
 	defer global.ETLDriver.Lock.Unlock()
-	delete(global.ETLDriver.Map, id)
 	_ = global.ETLDriver.Map[id].Close()
+	delete(global.ETLDriver.Map, id)
 }
\ No newline at end of file