mysql 协议的processInfo命令包及解析

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git

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

概况

mysql客户端通过processInfo命令查询服务端活跃进程。

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

processInfo命令包

Payload

1              [0a] COM_PROCCESS_INFO

更多详情： http://dev.mysql.com/doc/internals/en/com-process-info.htm

processInfo命令包类

/** *  * <pre><b>process info command packet.</b></pre> * @author  * <pre>seaboat</pre> * <pre><b>email: </b>849586227@qq.com</pre> * <pre><b>blog: </b>http://blog.csdn.net/wangyangzhizhou</pre> * @version 1.0 * @see http://dev.mysql.com/doc/internals/en/com-process-info.html */public class ProcessInfoPacket extends MySQLPacket {    public byte payload;    @Override    public int calcPacketSize() {        return 1;    }    @Override    protected String getPacketInfo() {        return "MySQL Process Info 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_PROCESS_INFO);    }}

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