Remove SET_IDENTITY_INSERT for transactions in MS SQL

SET_IDENTITY_INSERT should be handled by each individual developer to avoid extra queries to the database.

dialects/mssql/mssql.go

@@ -11,14 +11,7 @@ import (
 	"github.com/jinzhu/gorm"
 )
 
-func setIdentityInsert(scope *gorm.Scope) {
-	if scope.Dialect().GetName() == "mssql" {
-		scope.NewDB().Exec(fmt.Sprintf("SET IDENTITY_INSERT %v ON", scope.TableName()))
-	}
-}
-
 func init() {
-	gorm.DefaultCallback.Create().After("gorm:begin_transaction").Register("mssql:set_identity_insert", setIdentityInsert)
 	gorm.RegisterDialect("mssql", &mssql{})
 }