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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"
import "strings"
// Set represents a SET or RESET statement.
type Set struct {
Name VarName
Values Exprs
SetMode SetMode
}
// SetMode is an enum of the various set modes.
type SetMode int
const (
// SetModeAssign represents a SET statement.
SetModeAssign SetMode = iota
// SetModeReset represents a RESET statement.
SetModeReset
// SetModeClusterSetting represents a SET CLUSTER SETTING statement.
SetModeClusterSetting
)
// Format implements the NodeFormatter interface.
func (node *Set) Format(buf *bytes.Buffer, f FmtFlags) {
switch node.SetMode {
case SetModeAssign, SetModeClusterSetting:
buf.WriteString("SET ")
if node.SetMode == SetModeClusterSetting {
buf.WriteString("CLUSTER SETTING ")
}
if node.Name != nil {
FormatNode(buf, f, node.Name)
buf.WriteString(" = ")
}
if node.Values == nil {
buf.WriteString("DEFAULT")
} else {
FormatNode(buf, f, node.Values)
}
case SetModeReset:
buf.WriteString("RESET ")
FormatNode(buf, f, node.Name)
}
}
// SetTransaction represents a SET TRANSACTION statement.
type SetTransaction struct {
Isolation IsolationLevel
UserPriority UserPriority
}
// Format implements the NodeFormatter interface.
func (node *SetTransaction) Format(buf *bytes.Buffer, f FmtFlags) {
var sep string
buf.WriteString("SET TRANSACTION")
if node.Isolation != UnspecifiedIsolation {
buf.WriteString(" ISOLATION LEVEL ")
buf.WriteString(node.Isolation.String())
sep = ","
}
if node.UserPriority != UnspecifiedUserPriority {
buf.WriteString(sep)
buf.WriteString(" PRIORITY ")
buf.WriteString(node.UserPriority.String())
}
}
// SetTimeZone represents a SET TIME ZONE statement.
type SetTimeZone struct {
Value Expr
}
// Format implements the NodeFormatter interface.
func (node *SetTimeZone) Format(buf *bytes.Buffer, f FmtFlags) {
buf.WriteString("SET TIME ZONE ")
switch node.Value.(type) {
case *DInterval:
FormatNode(buf, f, node.Value)
default:
var s string
switch v := node.Value.(type) {
case *DString:
s = string(*v)
case *StrVal:
s = strings.ToUpper(v.s)
}
if s == "DEFAULT" || s == "LOCAL" {
buf.WriteString(s)
} else {
FormatNode(buf, f, node.Value)
}
}
}
// SetDefaultIsolation represents a SET SESSION CHARACTERISTICS AS TRANSACTION statement.
type SetDefaultIsolation struct {
Isolation IsolationLevel
}
// Format implements the NodeFormatter interface.
func (node *SetDefaultIsolation) Format(buf *bytes.Buffer, f FmtFlags) {
buf.WriteString("SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL")
if node.Isolation != UnspecifiedIsolation {
buf.WriteByte(' ')
buf.WriteString(node.Isolation.String())
}
}