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mysql协议的processInfo命令包及解析

时间:2021-07-01 10:21:17 帮助过:32人阅读

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
stringpayload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://www.gxlcms.com/;/pre>
 * @version 1.0
 * @see http://www.gxlcms.com/
 */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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