mysql协议的statistics命令包及解析

来源：666游戏网

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
int<3>	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
int<1>	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><b>statistics command packet.</b></pre>
 * @author 
 * <pre>seaboat</pre>
 * <pre><b>email: </b>849586227@qq.com</pre>
 * <pre><b>blog: </b>http://www.gxlcms.com/;/pre>
 * @version 1.0
 * @see http://www.gxlcms.com/
 */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);
 }

}