詳細介紹mysql 協定的FieldList指令包及解析

git

https://github.com/sea-boat/mysql-protocol

概況

#當mysql客戶端使用show column指令時即對應這個FieldList指令包。

mysql通訊封包結構

##string payload報文體，長度即為前面指定的payload長度

類型	名字	描述
#int5bdf4c78156c7953567bb5a0aef2fc53	payload長度	#按照the least significant byte first存儲，3個字節的payload和1個字節的序號組合成報文頭
intf35d6e602fd7d0f0edfa6f7d103c1b57	#序號

#FieldList指令套件

Payload

1              [04] COM_FIELD_LISTstring[NUL]    tablestring[EOF]    field wildcard

更多詳情： http://dev.mysql.com/doc/internals/en/com-field-list.html

#FieldList指令套件操作

1. FieldList指令套件類別

#

/**
 * 
 * <pre class="brush:php;toolbar:false"><b>mysql field list packet.</b>

* @author *

seaboat

*

<b>email: </b>849586227@qq.com

*

<b>blog: </b>http://www.php.cn/;/pre>
 * @version 1.0
 * @see http://www.php.cn/
 */public class FieldListPacket extends MySQLPacket {
    public byte flag;    public byte[] table;    public byte[] fieldWildcard;    @Override
    public void read(byte[] data) {
        MySQLMessage mm = new MySQLMessage(data);
        packetLength = mm.readUB3();
        packetId = mm.read();
        flag = mm.read();
        table = mm.readBytesWithNull();
        fieldWildcard = mm.readBytes();
    }    @Override
    public void write(ByteBuffer buffer) {
        BufferUtil.writeUB3(buffer, calcPacketSize());
        buffer.put(packetId);
        buffer.put(COM_FIELD_LIST);
        BufferUtil.writeWithNull(buffer, table);
        buffer.put(fieldWildcard);
    }    @Override
    public int calcPacketSize() {        int i = 1;
        i += table.length + 1;
        i += fieldWildcard.length;        return i;
    }    @Override
    protected String getPacketInfo() {        return "MySQL Field List Packet";
    }

}

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