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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.
// 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"
// Update represents an UPDATE statement.
type Update struct {
Table TableExpr
Exprs UpdateExprs
Where *Where
Returning ReturningClause
}
// Format implements the NodeFormatter interface.
func (node *Update) Format(buf *bytes.Buffer, f FmtFlags) {
buf.WriteString("UPDATE ")
FormatNode(buf, f, node.Table)
buf.WriteString(" SET ")
FormatNode(buf, f, node.Exprs)
FormatNode(buf, f, node.Where)
FormatNode(buf, f, node.Returning)
}
// UpdateExprs represents a list of update expressions.
type UpdateExprs []*UpdateExpr
// Format implements the NodeFormatter interface.
func (node UpdateExprs) Format(buf *bytes.Buffer, f FmtFlags) {
for i, n := range node {
if i > 0 {
buf.WriteString(", ")
}
FormatNode(buf, f, n)
}
}
// UpdateExpr represents an update expression.
type UpdateExpr struct {
Tuple bool
Names UnresolvedNames
Expr Expr
}
// Format implements the NodeFormatter interface.
func (node *UpdateExpr) Format(buf *bytes.Buffer, f FmtFlags) {
open, close := "", ""
if node.Tuple {
open, close = "(", ")"
}
buf.WriteString(open)
FormatNode(buf, f, node.Names)
buf.WriteString(close)
buf.WriteString(" = ")
FormatNode(buf, f, node.Expr)
}