119 lines
3.5 KiB
Go
119 lines
3.5 KiB
Go
// 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 server
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import (
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"fmt"
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"github.com/pingcap/tidb/parser/charset"
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"github.com/pingcap/tidb/parser/mysql"
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)
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const maxColumnNameSize = 256
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// ColumnInfo contains information of a column
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type ColumnInfo struct {
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Schema string
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Table string
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OrgTable string
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Name string
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OrgName string
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ColumnLength uint32
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Charset uint16
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Flag uint16
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Decimal uint8
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Type uint8
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DefaultValue any
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}
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// Dump dumps ColumnInfo to bytes.
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func (column *ColumnInfo) Dump(buffer []byte, d *resultEncoder) []byte {
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return column.dump(buffer, d, false)
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}
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// DumpWithDefault dumps ColumnInfo to bytes, including column defaults. This is used for ComFieldList responses.
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func (column *ColumnInfo) DumpWithDefault(buffer []byte, d *resultEncoder) []byte {
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return column.dump(buffer, d, true)
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}
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func (column *ColumnInfo) dump(buffer []byte, d *resultEncoder, withDefault bool) []byte {
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if d == nil {
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d = newResultEncoder(charset.CharsetUTF8MB4)
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}
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nameDump, orgnameDump := []byte(column.Name), []byte(column.OrgName)
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if len(nameDump) > maxColumnNameSize {
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nameDump = nameDump[0:maxColumnNameSize]
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}
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if len(orgnameDump) > maxColumnNameSize {
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orgnameDump = orgnameDump[0:maxColumnNameSize]
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}
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buffer = dumpLengthEncodedString(buffer, []byte("def"))
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buffer = dumpLengthEncodedString(buffer, d.encodeMeta([]byte(column.Schema)))
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buffer = dumpLengthEncodedString(buffer, d.encodeMeta([]byte(column.Table)))
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buffer = dumpLengthEncodedString(buffer, d.encodeMeta([]byte(column.OrgTable)))
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buffer = dumpLengthEncodedString(buffer, d.encodeMeta(nameDump))
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buffer = dumpLengthEncodedString(buffer, d.encodeMeta(orgnameDump))
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buffer = append(buffer, 0x0c)
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buffer = dumpUint16(buffer, d.columnTypeInfoCharsetID(column))
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buffer = dumpUint32(buffer, column.ColumnLength)
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buffer = append(buffer, dumpType(column.Type))
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buffer = dumpUint16(buffer, dumpFlag(column.Type, column.Flag))
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buffer = append(buffer, column.Decimal)
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buffer = append(buffer, 0, 0)
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if withDefault {
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switch column.DefaultValue {
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case "CURRENT_TIMESTAMP", "CURRENT_DATE", nil:
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buffer = append(buffer, 251) // NULL
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default:
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defaultValStr := fmt.Sprintf("%v", column.DefaultValue)
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buffer = dumpLengthEncodedString(buffer, []byte(defaultValStr))
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}
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}
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return buffer
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}
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func isStringColumnType(tp byte) bool {
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switch tp {
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case mysql.TypeString, mysql.TypeVarString, mysql.TypeVarchar, mysql.TypeBit,
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mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob, mysql.TypeBlob,
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mysql.TypeEnum, mysql.TypeSet, mysql.TypeJSON:
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return true
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}
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return false
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}
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func dumpFlag(tp byte, flag uint16) uint16 {
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switch tp {
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case mysql.TypeSet:
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return flag | uint16(mysql.SetFlag)
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case mysql.TypeEnum:
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return flag | uint16(mysql.EnumFlag)
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default:
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return flag
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}
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}
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func dumpType(tp byte) byte {
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switch tp {
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case mysql.TypeSet, mysql.TypeEnum:
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return mysql.TypeString
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default:
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return tp
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}
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}
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