Should use global NowFunc when trace SQL

Author: jinzhu

callback_create.go

@@ -50,7 +50,7 @@ func updateTimeStampForCreateCallback(scope *Scope) {
 // createCallback the callback used to insert data into database
 func createCallback(scope *Scope) {
 	if !scope.HasError() {
-		defer scope.trace(scope.db.nowFunc())
+		defer scope.trace(NowFunc())
 
 		var (
 			columns, placeholders        []string

callback_query.go

@@ -24,7 +24,7 @@ func queryCallback(scope *Scope) {
 		return
 	}
 
-	defer scope.trace(scope.db.nowFunc())
+	defer scope.trace(NowFunc())
 
 	var (
 		isSlice, isPtr bool

scope.go

@@ -358,7 +358,7 @@ func (scope *Scope) Raw(sql string) *Scope {
 
 // Exec perform generated SQL
 func (scope *Scope) Exec() *Scope {
-	defer scope.trace(scope.db.nowFunc())
+	defer scope.trace(NowFunc())
 
 	if !scope.HasError() {
 		if result, err := scope.SQLDB().Exec(scope.SQL, scope.SQLVars...); scope.Err(err) == nil {
@@ -934,7 +934,7 @@ func (scope *Scope) updatedAttrsWithValues(value interface{}) (results map[strin
 }
 
 func (scope *Scope) row() *sql.Row {
-	defer scope.trace(scope.db.nowFunc())
+	defer scope.trace(NowFunc())
 
 	result := &RowQueryResult{}
 	scope.InstanceSet("row_query_result", result)
@@ -944,7 +944,7 @@ func (scope *Scope) row() *sql.Row {
 }
 
 func (scope *Scope) rows() (*sql.Rows, error) {
-	defer scope.trace(scope.db.nowFunc())
+	defer scope.trace(NowFunc())
 
 	result := &RowsQueryResult{}
 	scope.InstanceSet("row_query_result", result)