mysql 协议的process kill包及解析

git

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

概况

mysql客户端可以用process kill命令让服务端终止某个连接，正常会返回ok包。

mysql通信报文结构

process kill命令包

Payload

1              [0c] COM_PROCCESS_KILL
4              connection id

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

process kill命令包类

/**
 *
 * <pre><b>mysql process kill 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-kill.html
 */
public class ProcessKillPacket extends MySQLPacket {

    public byte flag = (byte) 0xfe;
    public int connectionId;

    @Override
    public void read(byte[] data) {
        MySQLMessage mm = new MySQLMessage(data);
        packetLength = mm.readUB3();
        packetId = mm.read();
        flag = mm.read();
        connectionId = mm.readInt();
    }

    @Override
    public void write(ByteBuffer buffer) {
        int size = calcPacketSize();
        BufferUtil.writeUB3(buffer, size);
        buffer.put(packetId);
        buffer.put(COM_PROCESS_KILL);
        BufferUtil.writeInt(buffer, connectionId);
    }

    @Override
    public int calcPacketSize() {
        return 5;
    }

    @Override
    protected String getPacketInfo() {
        return "MySQL Process Kill Packet";
    }

}

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