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delete.go
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delete.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package ast
import (
"strings"
)
import (
"github.com/pkg/errors"
)
var _ Statement = (*DeleteStatement)(nil)
const (
_deleteLowPriority uint8 = 1 << iota
_deleteQuick
_deleteIgnore
)
// DeleteStatement represents mysql delete statement. see https://dev.mysql.com/doc/refman/8.0/en/delete.html
type DeleteStatement struct {
flag uint8
Table TableName
Hint *HintNode
Where ExpressionNode
OrderBy OrderByNode
Limit *LimitNode
}
// Restore implements Restorer.
func (ds *DeleteStatement) Restore(flag RestoreFlag, sb *strings.Builder, args *[]int) error {
sb.WriteString("DELETE ")
if ds.Hint != nil {
if err := ds.Hint.Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
sb.WriteString(" ")
}
if ds.IsLowPriority() {
sb.WriteString("LOW_PRIORITY ")
}
if ds.IsQuick() {
sb.WriteString("QUICK ")
}
if ds.IsIgnore() {
sb.WriteString("IGNORE ")
}
sb.WriteString("FROM ")
if err := ds.Table.Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
// TODO: partitions
if ds.Where != nil {
sb.WriteString(" WHERE ")
if err := ds.Where.Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
}
if ds.OrderBy != nil {
sb.WriteString(" ORDER BY ")
if err := ds.OrderBy.Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
}
if ds.Limit != nil {
sb.WriteString(" LIMIT ")
if err := ds.Limit.Restore(flag, sb, args); err != nil {
return errors.WithStack(err)
}
}
return nil
}
func (ds *DeleteStatement) Mode() SQLType {
return SQLTypeDelete
}
func (ds *DeleteStatement) IsLowPriority() bool {
return ds.flag&_deleteLowPriority != 0
}
func (ds *DeleteStatement) IsQuick() bool {
return ds.flag&_deleteQuick != 0
}
func (ds *DeleteStatement) IsIgnore() bool {
return ds.flag&_deleteIgnore != 0
}
func (ds *DeleteStatement) enableLowPriority() {
ds.flag |= _deleteLowPriority
}
func (ds *DeleteStatement) enableQuick() {
ds.flag |= _deleteQuick
}
func (ds *DeleteStatement) enableIgnore() {
ds.flag |= _deleteIgnore
}