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set.go
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set.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"
)
// Set represents a SET statement.
type Set struct {
Name *QualifiedName
Values Exprs
}
func (node *Set) String() string {
if node.Values == nil {
return fmt.Sprintf("SET %s = DEFAULT", node.Name)
}
return fmt.Sprintf("SET %s = %v", node.Name, node.Values)
}
// SetTransaction represents a SET TRANSACTION statement.
type SetTransaction struct {
Isolation IsolationLevel
UserPriority UserPriority
}
func (node *SetTransaction) String() string {
var buf bytes.Buffer
var sep string
buf.WriteString("SET TRANSACTION")
if node.Isolation != UnspecifiedIsolation {
fmt.Fprintf(&buf, " ISOLATION LEVEL %s", node.Isolation)
sep = ","
}
if node.UserPriority != UnspecifiedUserPriority {
fmt.Fprintf(&buf, "%s PRIORITY %s", sep, node.UserPriority)
}
return buf.String()
}
// SetTimeZone represents a SET TIME ZONE statement.
type SetTimeZone struct {
Value Expr
}
func (node *SetTimeZone) String() string {
prefix := "SET TIME ZONE"
onZoneStr := func(zone string) (string, bool) {
if zone == "DEFAULT" || zone == "LOCAL" {
return fmt.Sprintf("%s %s", prefix, zone), true
}
return "", false
}
switch v := node.Value.(type) {
case *DInterval:
return fmt.Sprintf("%s INTERVAL '%s'", prefix, v)
case *StrVal:
if s, ok := onZoneStr(v.s); ok {
return s
}
case *DString:
if s, ok := onZoneStr(string(*v)); ok {
return s
}
}
return fmt.Sprintf("%s %s", prefix, node.Value)
}
// SetDefaultIsolation represents a SET SESSION CHARACTERISTICS AS TRANSACTION statement.
type SetDefaultIsolation struct {
Isolation IsolationLevel
}
func (node *SetDefaultIsolation) String() string {
var buf bytes.Buffer
buf.WriteString("SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL")
if node.Isolation != UnspecifiedIsolation {
fmt.Fprintf(&buf, " %s", node.Isolation)
}
return buf.String()
}