forked from cockroachdb/cockroach
/
update.go
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/
update.go
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// Copyright 2015 The Cockroach Authors.
//
// 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.
//
// Author: Peter Mattis (peter@cockroachlabs.com)
// This code was derived from https://github.com/youtube/vitess.
//
// Copyright 2012, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file
package parser
import (
"bytes"
"fmt"
)
// Update represents an UPDATE statement.
type Update struct {
Table TableExpr
Exprs UpdateExprs
Where *Where
}
func (node *Update) String() string {
return fmt.Sprintf("UPDATE %s SET %s%s",
node.Table, node.Exprs, node.Where)
}
// UpdateExprs represents a list of update expressions.
type UpdateExprs []*UpdateExpr
func (node UpdateExprs) String() string {
var prefix string
var buf bytes.Buffer
for _, n := range node {
fmt.Fprintf(&buf, "%s%s", prefix, n)
prefix = ", "
}
return buf.String()
}
// UpdateExpr represents an update expression.
type UpdateExpr struct {
Tuple bool
Names QualifiedNames
Expr Expr
}
func (node *UpdateExpr) String() string {
open, close := "", ""
if node.Tuple {
open, close = "(", ")"
}
return fmt.Sprintf("%s%s%s = %s", open, node.Names, close, node.Expr)
}