Fix sync2 with custom table name (#1445)

* fix sync2 with custom table name

* fix bug on postgres

* fix bug on postgres

Author: lunny

session_schema.go

@@ -245,12 +245,17 @@ func (session *Session) Sync2(beans ...interface{}) error {
 		if err != nil {
 			return err
 		}
-		tbName := engine.TableName(bean)
-		tbNameWithSchema := engine.TableName(tbName, true)
+		var tbName string
+		if len(session.statement.AltTableName) > 0 {
+			tbName = session.statement.AltTableName
+		} else {
+			tbName = engine.TableName(bean)
+		}
+		tbNameWithSchema := engine.tbNameWithSchema(tbName)
 
 		var oriTable *core.Table
 		for _, tb := range tables {
-			if strings.EqualFold(tb.Name, tbName) {
+			if strings.EqualFold(engine.tbNameWithSchema(tb.Name), engine.tbNameWithSchema(tbName)) {
 				oriTable = tb
 				break
 			}

session_schema_test.go

@@ -119,6 +119,31 @@ func TestSyncTable(t *testing.T) {
 	assert.EqualValues(t, "sync_table1", tables[0].Name)
 }
 
+func TestSyncTable2(t *testing.T) {
+	assert.NoError(t, prepareEngine())
+
+	assert.NoError(t, testEngine.Table("sync_tablex").Sync2(new(SyncTable1)))
+
+	tables, err := testEngine.DBMetas()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, len(tables))
+	assert.EqualValues(t, "sync_tablex", tables[0].Name)
+	assert.EqualValues(t, 3, len(tables[0].Columns()))
+
+	type SyncTable4 struct {
+		SyncTable1 `xorm:"extends"`
+		NewCol     string
+	}
+
+	assert.NoError(t, testEngine.Table("sync_tablex").Sync2(new(SyncTable4)))
+	tables, err = testEngine.DBMetas()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, len(tables))
+	assert.EqualValues(t, "sync_tablex", tables[0].Name)
+	assert.EqualValues(t, 4, len(tables[0].Columns()))
+	assert.EqualValues(t, colMapper.Obj2Table("NewCol"), tables[0].Columns()[3].Name)
+}
+
 func TestIsTableExist(t *testing.T) {
 	assert.NoError(t, prepareEngine())