mysql 协议的statistics命令包及解析

git

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

概况

mysql客户端通过statistics命令查询服务端内部统计。

mysql通信报文结构

类型	名字	描述
int5bdf4c78156c7953567bb5a0aef2fc53	payload长度	按照the least significant byte first存储，3个字节的payload和1个字节的序列号组合成报文头
intf35d6e602fd7d0f0edfa6f7d103c1b57	序列号
string	payload	报文体，长度即为前面指定的payload长度

statistics命令包

Payload

1              [09] COM_STATISTICS

更多详情 ： http://dev.mysql.com/doc/internals/en/com-statistics.html

statistics命令包类

/**
 * 
 * <pre class="brush:php;toolbar:false"><b>statistics command 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 StatisticsPacket extends MySQLPacket {

    public byte payload;    
    @Override
    public int calcPacketSize() {        
    return 1;
    }    
    @Override
    protected String getPacketInfo() {        
    return "MySQL Statistics Packet";
    }    
    @Override
    public void read(byte[] data) {
        MySQLMessage mm = new MySQLMessage(data);
        packetLength = mm.readUB3();
        packetId = mm.read();
        payload = mm.read();
    }    @Override
    public void write(ByteBuffer buffer) {        
    int size = calcPacketSize();
        BufferUtil.writeUB3(buffer, size);
        buffer.put(packetId);
        buffer.put(COM_STATISTICS);
    }

}

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