81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// Copyright 2019 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 types
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import (
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"strings"
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"github.com/pingcap/parser/ast"
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"github.com/pingcap/parser/model"
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)
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// FieldName records the names used for mysql protocol.
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type FieldName struct {
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OrigTblName model.CIStr
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OrigColName model.CIStr
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DBName model.CIStr
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TblName model.CIStr
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ColName model.CIStr
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Hidden bool
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// NotExplicitUsable is used for mark whether a column can be explicit used in SQL.
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// update stmt can write `writeable` column implicitly but cannot use non-public columns explicit.
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// e.g. update t set a = 10 where b = 10; which `b` is in `writeOnly` state
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NotExplicitUsable bool
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}
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const emptyName = "EMPTY_NAME"
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// String implements Stringer interface.
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func (name *FieldName) String() string {
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builder := strings.Builder{}
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if name.Hidden {
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return emptyName
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}
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if name.DBName.L != "" {
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builder.WriteString(name.DBName.L + ".")
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}
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if name.TblName.L != "" {
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builder.WriteString(name.TblName.L + ".")
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}
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builder.WriteString(name.ColName.L)
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return builder.String()
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}
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// NameSlice is the slice of the *fieldName
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type NameSlice []*FieldName
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// Shallow is a shallow copy, only making a new slice.
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func (s NameSlice) Shallow() NameSlice {
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ret := make(NameSlice, len(s))
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copy(ret, s)
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return ret
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}
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// EmptyName is to occupy the position in the name slice. If it's set, that column's name is hidden.
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var EmptyName = &FieldName{Hidden: true}
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// FindAstColName checks whether the given ast.ColumnName is appeared in this slice.
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func (s NameSlice) FindAstColName(name *ast.ColumnName) bool {
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for _, fieldName := range s {
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if (name.Schema.L == "" || name.Schema.L == fieldName.DBName.L) &&
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(name.Table.L == "" || name.Table.L == fieldName.TblName.L) &&
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name.Name.L == fieldName.ColName.L {
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return true
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}
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}
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return false
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}
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