tidb structure 代码
文件路径：/structure/structure.go
/ Copyright 2015 PingCAP, Inc.
/
/ 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.
package structure
import (
mysql "github.com/pingcap/tidb/errno"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/util/dbterror"
)
var (
/ ErrInvalidHashKeyFlag used by structure
ErrInvalidHashKeyFlag = dbterror.ClassStructure.NewStd(mysql.ErrInvalidHashKeyFlag)
/ ErrInvalidListIndex used by structure
ErrInvalidListIndex = dbterror.ClassStructure.NewStd(mysql.ErrInvalidListIndex)
/ ErrInvalidListMetaData used by structure
ErrInvalidListMetaData = dbterror.ClassStructure.NewStd(mysql.ErrInvalidListMetaData)
/ ErrWriteOnSnapshot used by structure
ErrWriteOnSnapshot = dbterror.ClassStructure.NewStd(mysql.ErrWriteOnSnapshot)
)
/ NewStructure creates a TxStructure with Retriever, RetrieverMutator and key prefix.
func NewStructure(reader kv.Retriever, readWriter kv.RetrieverMutator, prefix []byte) *TxStructure {
return &TxStructure{
reader: reader,
readWriter: readWriter,
prefix: prefix,
}
}
/ TxStructure supports some simple data structures like string, hash, list, etc... and
/ you can use these in a transaction.
type TxStructure struct {
reader kv.Retriever
readWriter kv.RetrieverMutator
prefix []byte
}