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
| 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 |
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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