Fix tests for mysql, postgres

query_test.go

@@ -6,7 +6,6 @@ import (
 
 	"github.com/jinzhu/now"
 
-	"math/rand"
 	"testing"
 	"time"
 )
@@ -542,11 +541,15 @@ func TestSelectWithEscapedFieldName(t *testing.T) {
 func TestSelectWithVariables(t *testing.T) {
 	DB.Save(&User{Name: "jinzhu"})
 
-	randomNum := rand.Intn(1000000000)
+	rows, _ := DB.Table("users").Select("? as fake", "name").Rows()
-	rows, _ := DB.Table("users").Select("? as fake", randomNum).Where("fake = ?", randomNum).Rows()
 
 	if !rows.Next() {
 		t.Errorf("Should have returned at least one row")
+	} else {
+		columns, _ := rows.Columns()
+		if !reflect.DeepEqual(columns, []string{"fake"}) {
+			t.Errorf("Should only contains one column")
+		}
 	}
 }
 

scope_private.go

@@ -152,7 +152,7 @@ func (scope *Scope) buildSelectQuery(clause map[string]interface{}) (str string)
 			if valuer, ok := interface{}(arg).(driver.Valuer); ok {
 				arg, _ = valuer.Value()
 			}
-			str = strings.Replace(str, "?", scope.AddToVars(arg), 1)
+			str = strings.Replace(str, "?", scope.Dialect().Quote(fmt.Sprintf("%v", arg)), 1)
 		}
 	}
 	return