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insert.go
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insert.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"
// Insert represents an INSERT statement.
type Insert struct {
Table TableExpr
Columns UnresolvedNames
Rows *Select
OnConflict *OnConflict
Returning ReturningClause
}
// Format implements the NodeFormatter interface.
func (node *Insert) Format(buf *bytes.Buffer, f FmtFlags) {
if node.OnConflict.IsUpsertAlias() {
buf.WriteString("UPSERT")
} else {
buf.WriteString("INSERT")
}
buf.WriteString(" INTO ")
FormatNode(buf, f, node.Table)
if node.Columns != nil {
buf.WriteByte('(')
FormatNode(buf, f, node.Columns)
buf.WriteByte(')')
}
if node.DefaultValues() {
buf.WriteString(" DEFAULT VALUES")
} else {
buf.WriteByte(' ')
FormatNode(buf, f, node.Rows)
}
if node.OnConflict != nil && !node.OnConflict.IsUpsertAlias() {
buf.WriteString(" ON CONFLICT")
if len(node.OnConflict.Columns) > 0 {
buf.WriteString(" (")
FormatNode(buf, f, node.OnConflict.Columns)
buf.WriteString(")")
}
if node.OnConflict.DoNothing {
buf.WriteString(" DO NOTHING")
} else {
buf.WriteString(" DO UPDATE SET ")
FormatNode(buf, f, node.OnConflict.Exprs)
if node.OnConflict.Where != nil {
FormatNode(buf, f, node.OnConflict.Where)
}
}
}
FormatNode(buf, f, node.Returning)
}
// DefaultValues returns true iff only default values are being inserted.
func (node *Insert) DefaultValues() bool {
return node.Rows.Select == nil
}
// OnConflict represents an `ON CONFLICT (columns) DO UPDATE SET exprs WHERE
// where` clause.
//
// The zero value for OnConflict is used to signal the UPSERT short form, which
// uses the primary key for as the conflict index and the values being inserted
// for Exprs.
type OnConflict struct {
Columns NameList
Exprs UpdateExprs
Where *Where
DoNothing bool
}
// IsUpsertAlias returns true if the UPSERT syntactic sugar was used.
func (oc *OnConflict) IsUpsertAlias() bool {
return oc != nil && oc.Columns == nil && oc.Exprs == nil && oc.Where == nil && !oc.DoNothing
}