added query builder for orm

orm/qb.go

@@ -0,0 +1,30 @@
+// Copyright 2014 beego Author. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package orm
+
+type QueryBuilder interface {
+	Select(fields ...string) QueryWriter
+	From(tables ...string) QueryWriter
+	Where(cond string) QueryWriter
+	LimitOffset(limit int, offset int) QueryWriter
+	InnerJoin(table string) QueryWriter
+	LeftJoin(table string) QueryWriter
+	On(cond string) QueryWriter
+	And(cond string) QueryWriter
+	Or(cond string) QueryWriter
+	In(vals ...string) QueryWriter
+	Subquery(query string, rename string) string
+	String() string
+}