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table.go
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table.go
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// Copyright 2019 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package codec
import "github.com/cherrison/cherrykv-client/key"
var (
tablePrefix = []byte{'t'}
recordPrefixSep = []byte("_r")
indexPrefixSep = []byte("_i")
)
const (
idLen = 8
prefixLen = 1 + idLen /*tableID*/ + 2
recordRowKeyLen = prefixLen + idLen /*handle*/
tablePrefixLength = 1
recordPrefixSepLength = 2
)
// appendTableRecordPrefix appends table record prefix "t[tableID]_r".
func appendTableRecordPrefix(buf []byte, tableID int64) []byte {
buf = append(buf, tablePrefix...)
buf = EncodeInt(buf, tableID)
buf = append(buf, recordPrefixSep...)
return buf
}
// GenTableRecordPrefix composes record prefix with tableID: "t[tableID]_r".
func GenTableRecordPrefix(tableID int64) key.Key {
buf := make([]byte, 0, len(tablePrefix)+8+len(recordPrefixSep))
return appendTableRecordPrefix(buf, tableID)
}
// appendTableIndexPrefix appends table index prefix "t[tableID]_i".
func appendTableIndexPrefix(buf []byte, tableID int64) []byte {
buf = append(buf, tablePrefix...)
buf = EncodeInt(buf, tableID)
buf = append(buf, indexPrefixSep...)
return buf
}
// GenTableIndexPrefix composes index prefix with tableID: "t[tableID]_i".
func GenTableIndexPrefix(tableID int64) key.Key {
buf := make([]byte, 0, len(tablePrefix)+8+len(indexPrefixSep))
return appendTableIndexPrefix(buf, tableID)
}
// EncodeTableIndexPrefix encodes index prefix with tableID and idxID.
func EncodeTableIndexPrefix(tableID, idxID int64) key.Key {
key := make([]byte, 0, prefixLen)
key = appendTableIndexPrefix(key, tableID)
key = EncodeInt(key, idxID)
return key
}