move row, rows, scan to scope

callback_query.go

@@ -1,9 +1,7 @@
 package gorm
 
 import (
-	"fmt"
 	"reflect"
-	"strings"
 	"time"
 )
 
@@ -25,6 +23,9 @@ func Query(scope *Scope) {
 	)
 
 	var dest = reflect.Indirect(reflect.ValueOf(scope.Value))
+	if value, ok := scope.Get("gorm:query_destination"); ok {
+		dest = reflect.Indirect(reflect.ValueOf(value))
+	}
 
 	if dest.Kind() == reflect.Slice {
 		isSlice = true
@@ -33,11 +34,7 @@ func Query(scope *Scope) {
 		scope.Search = scope.Search.clone().limit(1)
 	}
 
-	if scope.Search.raw {
-		scope.Raw(strings.TrimLeft(scope.CombinedConditionSql(), "WHERE "))
-	} else {
-		scope.Raw(fmt.Sprintf("SELECT %v FROM %v %v", scope.SelectSql(), scope.TableName(), scope.CombinedConditionSql()))
-	}
+	scope.prepareQuerySql()
 
 	if !scope.HasError() {
 		rows, err := scope.DB().Query(scope.Sql, scope.SqlVars...)

main.go

@@ -109,6 +109,14 @@ func (s *DB) Unscoped() *DB {
 	return s.clone().search.unscoped().db
 }
 
+func (s *DB) Attrs(attrs ...interface{}) *DB {
+	return s.clone().search.attrs(attrs...).db
+}
+
+func (s *DB) Assign(attrs ...interface{}) *DB {
+	return s.clone().search.assign(attrs...).db
+}
+
 func (s *DB) First(out interface{}, where ...interface{}) *DB {
 	scope := s.clone().NewScope(out)
 	scope.Search = scope.Search.clone().order(scope.PrimaryKey()).limit(1)
@@ -126,23 +134,17 @@ func (s *DB) Find(out interface{}, where ...interface{}) *DB {
 }
 
 func (s *DB) Row() *sql.Row {
-	return s.do(s.Value).row()
+	return s.NewScope(s.Value).row()
 }
 
 func (s *DB) Rows() (*sql.Rows, error) {
-	return s.do(s.Value).rows()
+	return s.NewScope(s.Value).rows()
 }
 
 func (s *DB) Scan(dest interface{}) *DB {
-	return s.do(s.Value).query(dest).db
-}
-
-func (s *DB) Attrs(attrs ...interface{}) *DB {
-	return s.clone().search.attrs(attrs...).db
-}
-
-func (s *DB) Assign(attrs ...interface{}) *DB {
-	return s.clone().search.assign(attrs...).db
+	scope := s.clone().NewScope(s.Value).Set("gorm:query_destination", dest)
+	Query(scope)
+	return scope.db
 }
 
 func (s *DB) FirstOrInit(out interface{}, where ...interface{}) *DB {

scope.go

@@ -1,6 +1,7 @@
 package gorm
 
 import (
+	"database/sql"
 	"errors"
 	"fmt"
 	"github.com/jinzhu/gorm/dialect"
@@ -378,10 +379,23 @@ func (scope *Scope) CommitOrRollback() *Scope {
 	return scope
 }
 
-func (scope *Scope) SelectSql() string {
-	if len(scope.Search.selectStr) == 0 {
-		return "*"
+func (scope *Scope) prepareQuerySql() {
+	if scope.Search.raw {
+		scope.Raw(strings.TrimLeft(scope.CombinedConditionSql(), "WHERE "))
 	} else {
-		return scope.Search.selectStr
+		scope.Raw(fmt.Sprintf("SELECT %v FROM %v %v", scope.selectSql(), scope.TableName(), scope.CombinedConditionSql()))
 	}
+	return
+}
+
+func (scope *Scope) row() *sql.Row {
+	defer scope.Trace(time.Now())
+	scope.prepareQuerySql()
+	return scope.DB().QueryRow(scope.Sql, scope.SqlVars...)
+}
+
+func (scope *Scope) rows() (*sql.Rows, error) {
+	defer scope.Trace(time.Now())
+	scope.prepareQuerySql()
+	return scope.DB().Query(scope.Sql, scope.SqlVars...)
 }