mirror of
https://codeberg.org/forgejo/forgejo
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892 lines
18 KiB
Go
892 lines
18 KiB
Go
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// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ast
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import (
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"github.com/pingcap/tidb/model"
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)
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var (
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_ DMLNode = &DeleteStmt{}
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_ DMLNode = &InsertStmt{}
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_ DMLNode = &UnionStmt{}
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_ DMLNode = &UpdateStmt{}
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_ DMLNode = &SelectStmt{}
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_ DMLNode = &ShowStmt{}
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_ Node = &Assignment{}
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_ Node = &ByItem{}
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_ Node = &FieldList{}
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_ Node = &GroupByClause{}
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_ Node = &HavingClause{}
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_ Node = &Join{}
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_ Node = &Limit{}
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_ Node = &OnCondition{}
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_ Node = &OrderByClause{}
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_ Node = &SelectField{}
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_ Node = &TableName{}
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_ Node = &TableRefsClause{}
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_ Node = &TableSource{}
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_ Node = &UnionSelectList{}
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_ Node = &WildCardField{}
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)
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// JoinType is join type, including cross/left/right/full.
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type JoinType int
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const (
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// CrossJoin is cross join type.
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CrossJoin JoinType = iota + 1
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// LeftJoin is left Join type.
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LeftJoin
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// RightJoin is right Join type.
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RightJoin
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)
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// Join represents table join.
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type Join struct {
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node
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resultSetNode
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// Left table can be TableSource or JoinNode.
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Left ResultSetNode
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// Right table can be TableSource or JoinNode or nil.
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Right ResultSetNode
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// Tp represents join type.
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Tp JoinType
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// On represents join on condition.
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On *OnCondition
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}
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// Accept implements Node Accept interface.
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func (n *Join) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*Join)
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node, ok := n.Left.Accept(v)
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if !ok {
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return n, false
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}
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n.Left = node.(ResultSetNode)
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if n.Right != nil {
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node, ok = n.Right.Accept(v)
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if !ok {
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return n, false
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}
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n.Right = node.(ResultSetNode)
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}
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if n.On != nil {
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node, ok = n.On.Accept(v)
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if !ok {
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return n, false
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}
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n.On = node.(*OnCondition)
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}
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return v.Leave(n)
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}
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// TableName represents a table name.
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type TableName struct {
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node
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resultSetNode
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Schema model.CIStr
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Name model.CIStr
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DBInfo *model.DBInfo
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TableInfo *model.TableInfo
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}
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// Accept implements Node Accept interface.
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func (n *TableName) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*TableName)
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return v.Leave(n)
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}
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// DeleteTableList is the tablelist used in delete statement multi-table mode.
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type DeleteTableList struct {
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node
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Tables []*TableName
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}
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// Accept implements Node Accept interface.
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func (n *DeleteTableList) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*DeleteTableList)
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if n != nil {
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for i, t := range n.Tables {
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node, ok := t.Accept(v)
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if !ok {
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return n, false
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}
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n.Tables[i] = node.(*TableName)
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}
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}
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return v.Leave(n)
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}
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// OnCondition represetns JOIN on condition.
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type OnCondition struct {
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node
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Expr ExprNode
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}
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// Accept implements Node Accept interface.
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func (n *OnCondition) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*OnCondition)
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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return v.Leave(n)
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}
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// TableSource represents table source with a name.
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type TableSource struct {
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node
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// Source is the source of the data, can be a TableName,
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// a SelectStmt, a UnionStmt, or a JoinNode.
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Source ResultSetNode
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// AsName is the alias name of the table source.
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AsName model.CIStr
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}
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// Accept implements Node Accept interface.
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func (n *TableSource) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*TableSource)
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node, ok := n.Source.Accept(v)
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if !ok {
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return n, false
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}
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n.Source = node.(ResultSetNode)
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return v.Leave(n)
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}
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// SetResultFields implements ResultSetNode interface.
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func (n *TableSource) SetResultFields(rfs []*ResultField) {
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n.Source.SetResultFields(rfs)
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}
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// GetResultFields implements ResultSetNode interface.
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func (n *TableSource) GetResultFields() []*ResultField {
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return n.Source.GetResultFields()
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}
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// SelectLockType is the lock type for SelectStmt.
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type SelectLockType int
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// Select lock types.
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const (
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SelectLockNone SelectLockType = iota
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SelectLockForUpdate
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SelectLockInShareMode
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)
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// WildCardField is a special type of select field content.
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type WildCardField struct {
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node
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Table model.CIStr
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Schema model.CIStr
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}
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// Accept implements Node Accept interface.
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func (n *WildCardField) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*WildCardField)
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return v.Leave(n)
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}
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// SelectField represents fields in select statement.
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// There are two type of select field: wildcard
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// and expression with optional alias name.
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type SelectField struct {
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node
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// Offset is used to get original text.
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Offset int
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// If WildCard is not nil, Expr will be nil.
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WildCard *WildCardField
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// If Expr is not nil, WildCard will be nil.
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Expr ExprNode
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// Alias name for Expr.
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AsName model.CIStr
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}
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// Accept implements Node Accept interface.
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func (n *SelectField) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*SelectField)
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if n.Expr != nil {
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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}
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return v.Leave(n)
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}
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// FieldList represents field list in select statement.
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type FieldList struct {
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node
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Fields []*SelectField
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}
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// Accept implements Node Accept interface.
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func (n *FieldList) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*FieldList)
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for i, val := range n.Fields {
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node, ok := val.Accept(v)
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if !ok {
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return n, false
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}
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n.Fields[i] = node.(*SelectField)
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}
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return v.Leave(n)
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}
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// TableRefsClause represents table references clause in dml statement.
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type TableRefsClause struct {
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node
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TableRefs *Join
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}
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// Accept implements Node Accept interface.
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func (n *TableRefsClause) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*TableRefsClause)
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node, ok := n.TableRefs.Accept(v)
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if !ok {
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return n, false
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}
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n.TableRefs = node.(*Join)
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return v.Leave(n)
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}
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// ByItem represents an item in order by or group by.
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type ByItem struct {
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node
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Expr ExprNode
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Desc bool
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}
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// Accept implements Node Accept interface.
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func (n *ByItem) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*ByItem)
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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return v.Leave(n)
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}
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// GroupByClause represents group by clause.
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type GroupByClause struct {
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node
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Items []*ByItem
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}
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// Accept implements Node Accept interface.
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func (n *GroupByClause) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*GroupByClause)
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for i, val := range n.Items {
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node, ok := val.Accept(v)
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if !ok {
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return n, false
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}
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n.Items[i] = node.(*ByItem)
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}
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return v.Leave(n)
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}
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// HavingClause represents having clause.
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type HavingClause struct {
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node
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Expr ExprNode
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}
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// Accept implements Node Accept interface.
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func (n *HavingClause) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*HavingClause)
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node, ok := n.Expr.Accept(v)
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if !ok {
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return n, false
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}
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n.Expr = node.(ExprNode)
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return v.Leave(n)
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}
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// OrderByClause represents order by clause.
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type OrderByClause struct {
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node
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Items []*ByItem
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ForUnion bool
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}
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// Accept implements Node Accept interface.
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func (n *OrderByClause) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*OrderByClause)
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for i, val := range n.Items {
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node, ok := val.Accept(v)
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if !ok {
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return n, false
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}
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n.Items[i] = node.(*ByItem)
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}
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return v.Leave(n)
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}
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// SelectStmt represents the select query node.
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// See: https://dev.mysql.com/doc/refman/5.7/en/select.html
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type SelectStmt struct {
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dmlNode
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resultSetNode
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// Distinct represents if the select has distinct option.
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Distinct bool
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// From is the from clause of the query.
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From *TableRefsClause
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// Where is the where clause in select statement.
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Where ExprNode
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// Fields is the select expression list.
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Fields *FieldList
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// GroupBy is the group by expression list.
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GroupBy *GroupByClause
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// Having is the having condition.
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Having *HavingClause
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// OrderBy is the ordering expression list.
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OrderBy *OrderByClause
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// Limit is the limit clause.
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Limit *Limit
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// Lock is the lock type
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LockTp SelectLockType
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}
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// Accept implements Node Accept interface.
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func (n *SelectStmt) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*SelectStmt)
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if n.From != nil {
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node, ok := n.From.Accept(v)
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if !ok {
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return n, false
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}
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n.From = node.(*TableRefsClause)
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}
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if n.Where != nil {
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node, ok := n.Where.Accept(v)
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if !ok {
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return n, false
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}
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n.Where = node.(ExprNode)
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}
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if n.Fields != nil {
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node, ok := n.Fields.Accept(v)
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if !ok {
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return n, false
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}
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n.Fields = node.(*FieldList)
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}
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if n.GroupBy != nil {
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node, ok := n.GroupBy.Accept(v)
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if !ok {
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return n, false
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}
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n.GroupBy = node.(*GroupByClause)
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}
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if n.Having != nil {
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node, ok := n.Having.Accept(v)
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if !ok {
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return n, false
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}
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n.Having = node.(*HavingClause)
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}
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if n.OrderBy != nil {
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node, ok := n.OrderBy.Accept(v)
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if !ok {
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return n, false
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}
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n.OrderBy = node.(*OrderByClause)
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}
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if n.Limit != nil {
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|
node, ok := n.Limit.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Limit = node.(*Limit)
|
||
|
}
|
||
|
|
||
|
return v.Leave(n)
|
||
|
}
|
||
|
|
||
|
// UnionSelectList represents the select list in a union statement.
|
||
|
type UnionSelectList struct {
|
||
|
node
|
||
|
|
||
|
Selects []*SelectStmt
|
||
|
}
|
||
|
|
||
|
// Accept implements Node Accept interface.
|
||
|
func (n *UnionSelectList) Accept(v Visitor) (Node, bool) {
|
||
|
newNode, skipChildren := v.Enter(n)
|
||
|
if skipChildren {
|
||
|
return v.Leave(newNode)
|
||
|
}
|
||
|
n = newNode.(*UnionSelectList)
|
||
|
for i, sel := range n.Selects {
|
||
|
node, ok := sel.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Selects[i] = node.(*SelectStmt)
|
||
|
}
|
||
|
return v.Leave(n)
|
||
|
}
|
||
|
|
||
|
// UnionStmt represents "union statement"
|
||
|
// See: https://dev.mysql.com/doc/refman/5.7/en/union.html
|
||
|
type UnionStmt struct {
|
||
|
dmlNode
|
||
|
resultSetNode
|
||
|
|
||
|
Distinct bool
|
||
|
SelectList *UnionSelectList
|
||
|
OrderBy *OrderByClause
|
||
|
Limit *Limit
|
||
|
}
|
||
|
|
||
|
// Accept implements Node Accept interface.
|
||
|
func (n *UnionStmt) Accept(v Visitor) (Node, bool) {
|
||
|
newNode, skipChildren := v.Enter(n)
|
||
|
if skipChildren {
|
||
|
return v.Leave(newNode)
|
||
|
}
|
||
|
n = newNode.(*UnionStmt)
|
||
|
if n.SelectList != nil {
|
||
|
node, ok := n.SelectList.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.SelectList = node.(*UnionSelectList)
|
||
|
}
|
||
|
if n.OrderBy != nil {
|
||
|
node, ok := n.OrderBy.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.OrderBy = node.(*OrderByClause)
|
||
|
}
|
||
|
if n.Limit != nil {
|
||
|
node, ok := n.Limit.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Limit = node.(*Limit)
|
||
|
}
|
||
|
return v.Leave(n)
|
||
|
}
|
||
|
|
||
|
// Assignment is the expression for assignment, like a = 1.
|
||
|
type Assignment struct {
|
||
|
node
|
||
|
// Column is the column name to be assigned.
|
||
|
Column *ColumnName
|
||
|
// Expr is the expression assigning to ColName.
|
||
|
Expr ExprNode
|
||
|
}
|
||
|
|
||
|
// Accept implements Node Accept interface.
|
||
|
func (n *Assignment) Accept(v Visitor) (Node, bool) {
|
||
|
newNode, skipChildren := v.Enter(n)
|
||
|
if skipChildren {
|
||
|
return v.Leave(newNode)
|
||
|
}
|
||
|
n = newNode.(*Assignment)
|
||
|
node, ok := n.Column.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Column = node.(*ColumnName)
|
||
|
node, ok = n.Expr.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Expr = node.(ExprNode)
|
||
|
return v.Leave(n)
|
||
|
}
|
||
|
|
||
|
// Priority const values.
|
||
|
// See: https://dev.mysql.com/doc/refman/5.7/en/insert.html
|
||
|
const (
|
||
|
NoPriority = iota
|
||
|
LowPriority
|
||
|
HighPriority
|
||
|
DelayedPriority
|
||
|
)
|
||
|
|
||
|
// InsertStmt is a statement to insert new rows into an existing table.
|
||
|
// See: https://dev.mysql.com/doc/refman/5.7/en/insert.html
|
||
|
type InsertStmt struct {
|
||
|
dmlNode
|
||
|
|
||
|
IsReplace bool
|
||
|
Table *TableRefsClause
|
||
|
Columns []*ColumnName
|
||
|
Lists [][]ExprNode
|
||
|
Setlist []*Assignment
|
||
|
Priority int
|
||
|
OnDuplicate []*Assignment
|
||
|
Select ResultSetNode
|
||
|
}
|
||
|
|
||
|
// Accept implements Node Accept interface.
|
||
|
func (n *InsertStmt) Accept(v Visitor) (Node, bool) {
|
||
|
newNode, skipChildren := v.Enter(n)
|
||
|
if skipChildren {
|
||
|
return v.Leave(newNode)
|
||
|
}
|
||
|
|
||
|
n = newNode.(*InsertStmt)
|
||
|
if n.Select != nil {
|
||
|
node, ok := n.Select.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Select = node.(ResultSetNode)
|
||
|
}
|
||
|
|
||
|
node, ok := n.Table.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Table = node.(*TableRefsClause)
|
||
|
|
||
|
for i, val := range n.Columns {
|
||
|
node, ok := val.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Columns[i] = node.(*ColumnName)
|
||
|
}
|
||
|
for i, list := range n.Lists {
|
||
|
for j, val := range list {
|
||
|
node, ok := val.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Lists[i][j] = node.(ExprNode)
|
||
|
}
|
||
|
}
|
||
|
for i, val := range n.Setlist {
|
||
|
node, ok := val.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Setlist[i] = node.(*Assignment)
|
||
|
}
|
||
|
for i, val := range n.OnDuplicate {
|
||
|
node, ok := val.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.OnDuplicate[i] = node.(*Assignment)
|
||
|
}
|
||
|
return v.Leave(n)
|
||
|
}
|
||
|
|
||
|
// DeleteStmt is a statement to delete rows from table.
|
||
|
// See: https://dev.mysql.com/doc/refman/5.7/en/delete.html
|
||
|
type DeleteStmt struct {
|
||
|
dmlNode
|
||
|
|
||
|
// Used in both single table and multiple table delete statement.
|
||
|
TableRefs *TableRefsClause
|
||
|
// Only used in multiple table delete statement.
|
||
|
Tables *DeleteTableList
|
||
|
Where ExprNode
|
||
|
Order *OrderByClause
|
||
|
Limit *Limit
|
||
|
LowPriority bool
|
||
|
Ignore bool
|
||
|
Quick bool
|
||
|
IsMultiTable bool
|
||
|
BeforeFrom bool
|
||
|
}
|
||
|
|
||
|
// Accept implements Node Accept interface.
|
||
|
func (n *DeleteStmt) Accept(v Visitor) (Node, bool) {
|
||
|
newNode, skipChildren := v.Enter(n)
|
||
|
if skipChildren {
|
||
|
return v.Leave(newNode)
|
||
|
}
|
||
|
|
||
|
n = newNode.(*DeleteStmt)
|
||
|
node, ok := n.TableRefs.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.TableRefs = node.(*TableRefsClause)
|
||
|
|
||
|
node, ok = n.Tables.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Tables = node.(*DeleteTableList)
|
||
|
|
||
|
if n.Where != nil {
|
||
|
node, ok = n.Where.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Where = node.(ExprNode)
|
||
|
}
|
||
|
if n.Order != nil {
|
||
|
node, ok = n.Order.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Order = node.(*OrderByClause)
|
||
|
}
|
||
|
if n.Limit != nil {
|
||
|
node, ok = n.Limit.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Limit = node.(*Limit)
|
||
|
}
|
||
|
return v.Leave(n)
|
||
|
}
|
||
|
|
||
|
// UpdateStmt is a statement to update columns of existing rows in tables with new values.
|
||
|
// See: https://dev.mysql.com/doc/refman/5.7/en/update.html
|
||
|
type UpdateStmt struct {
|
||
|
dmlNode
|
||
|
|
||
|
TableRefs *TableRefsClause
|
||
|
List []*Assignment
|
||
|
Where ExprNode
|
||
|
Order *OrderByClause
|
||
|
Limit *Limit
|
||
|
LowPriority bool
|
||
|
Ignore bool
|
||
|
MultipleTable bool
|
||
|
}
|
||
|
|
||
|
// Accept implements Node Accept interface.
|
||
|
func (n *UpdateStmt) Accept(v Visitor) (Node, bool) {
|
||
|
newNode, skipChildren := v.Enter(n)
|
||
|
if skipChildren {
|
||
|
return v.Leave(newNode)
|
||
|
}
|
||
|
n = newNode.(*UpdateStmt)
|
||
|
node, ok := n.TableRefs.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.TableRefs = node.(*TableRefsClause)
|
||
|
for i, val := range n.List {
|
||
|
node, ok = val.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.List[i] = node.(*Assignment)
|
||
|
}
|
||
|
if n.Where != nil {
|
||
|
node, ok = n.Where.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Where = node.(ExprNode)
|
||
|
}
|
||
|
if n.Order != nil {
|
||
|
node, ok = n.Order.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Order = node.(*OrderByClause)
|
||
|
}
|
||
|
if n.Limit != nil {
|
||
|
node, ok = n.Limit.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Limit = node.(*Limit)
|
||
|
}
|
||
|
return v.Leave(n)
|
||
|
}
|
||
|
|
||
|
// Limit is the limit clause.
|
||
|
type Limit struct {
|
||
|
node
|
||
|
|
||
|
Offset uint64
|
||
|
Count uint64
|
||
|
}
|
||
|
|
||
|
// Accept implements Node Accept interface.
|
||
|
func (n *Limit) Accept(v Visitor) (Node, bool) {
|
||
|
newNode, skipChildren := v.Enter(n)
|
||
|
if skipChildren {
|
||
|
return v.Leave(newNode)
|
||
|
}
|
||
|
n = newNode.(*Limit)
|
||
|
return v.Leave(n)
|
||
|
}
|
||
|
|
||
|
// ShowStmtType is the type for SHOW statement.
|
||
|
type ShowStmtType int
|
||
|
|
||
|
// Show statement types.
|
||
|
const (
|
||
|
ShowNone = iota
|
||
|
ShowEngines
|
||
|
ShowDatabases
|
||
|
ShowTables
|
||
|
ShowTableStatus
|
||
|
ShowColumns
|
||
|
ShowWarnings
|
||
|
ShowCharset
|
||
|
ShowVariables
|
||
|
ShowStatus
|
||
|
ShowCollation
|
||
|
ShowCreateTable
|
||
|
ShowGrants
|
||
|
ShowTriggers
|
||
|
ShowProcedureStatus
|
||
|
ShowIndex
|
||
|
)
|
||
|
|
||
|
// ShowStmt is a statement to provide information about databases, tables, columns and so on.
|
||
|
// See: https://dev.mysql.com/doc/refman/5.7/en/show.html
|
||
|
type ShowStmt struct {
|
||
|
dmlNode
|
||
|
resultSetNode
|
||
|
|
||
|
Tp ShowStmtType // Databases/Tables/Columns/....
|
||
|
DBName string
|
||
|
Table *TableName // Used for showing columns.
|
||
|
Column *ColumnName // Used for `desc table column`.
|
||
|
Flag int // Some flag parsed from sql, such as FULL.
|
||
|
Full bool
|
||
|
User string // Used for show grants.
|
||
|
|
||
|
// Used by show variables
|
||
|
GlobalScope bool
|
||
|
Pattern *PatternLikeExpr
|
||
|
Where ExprNode
|
||
|
}
|
||
|
|
||
|
// Accept implements Node Accept interface.
|
||
|
func (n *ShowStmt) Accept(v Visitor) (Node, bool) {
|
||
|
newNode, skipChildren := v.Enter(n)
|
||
|
if skipChildren {
|
||
|
return v.Leave(newNode)
|
||
|
}
|
||
|
n = newNode.(*ShowStmt)
|
||
|
if n.Table != nil {
|
||
|
node, ok := n.Table.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Table = node.(*TableName)
|
||
|
}
|
||
|
if n.Column != nil {
|
||
|
node, ok := n.Column.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Column = node.(*ColumnName)
|
||
|
}
|
||
|
if n.Pattern != nil {
|
||
|
node, ok := n.Pattern.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Pattern = node.(*PatternLikeExpr)
|
||
|
}
|
||
|
if n.Where != nil {
|
||
|
node, ok := n.Where.Accept(v)
|
||
|
if !ok {
|
||
|
return n, false
|
||
|
}
|
||
|
n.Where = node.(ExprNode)
|
||
|
}
|
||
|
return v.Leave(n)
|
||
|
}
|