Fix update bug

integrations/session_update_test.go

@@ -15,6 +15,7 @@ import (
 	"xorm.io/xorm/internal/statements"
 	"xorm.io/xorm/internal/utils"
 	"xorm.io/xorm/names"
+	"xorm.io/xorm/schemas"
 )
 
 func TestUpdateMap(t *testing.T) {
@@ -48,6 +49,19 @@ func TestUpdateMap(t *testing.T) {
 	assert.Error(t, err)
 	assert.True(t, statements.IsIDConditionWithNoTableErr(err))
 	assert.EqualValues(t, 0, cnt)
+
+	cnt, err = testEngine.Table("update_table").Update(map[string]interface{}{
+		"name": "test2",
+		"age":  36,
+	}, &UpdateTable{
+		Id: tb.Id,
+	})
+	assert.NoError(t, err)
+	if testEngine.Dialect().URI().DBType == schemas.SQLITE {
+		assert.EqualValues(t, 1, cnt)
+	} else {
+		assert.EqualValues(t, 0, cnt)
+	}
 }
 
 func TestUpdateLimit(t *testing.T) {

session_update.go

@@ -273,8 +273,15 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 					k = ct.Elem().Kind()
 				}
 				if k == reflect.Struct {
+					var refTable = session.statement.RefTable
+					if refTable == nil {
+						refTable, err = session.engine.TableInfo(condiBean[0])
+						if err != nil {
+							return 0, err
+						}
+					}
 					var err error
-					autoCond, err = session.statement.BuildConds(session.statement.RefTable, condiBean[0], true, true, false, true, false)
+					autoCond, err = session.statement.BuildConds(refTable, condiBean[0], true, true, false, true, false)
 					if err != nil {
 						return 0, err
 					}