processInfo command package and analysis of mysql protocol

git

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

Overview

The mysql client queries the active processes on the server through the processInfo command.

mysql communication message structure

##string payloadMessage body, the length is the previously specified payload length

Type	Name	Description
int<3>	payload length	Stored according to the least significant byte first, 3-byte payload and 1-byte sequence number combination Into the message header
int<1>	sequence number

processInfo command package

Payload

1              [0a] COM_PROCCESS_INFO

More details: http://dev.mysql.com/doc/internals/en/com-process-info.htm

processInfo command package class

/**
 * 
 * <pre class="brush:php;toolbar:false"><b>process info 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 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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