mysql协议的删除DB命令包及解析
2020-11-09
来源：品趣旅游知识分享网
git
https://github.com/sea-boat/mysql-protocol
概况
mysql客户端通过删除DB命令包告诉服务端删除某个schema。
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 |
删除DB命令包
Payload
1 [06] COM_DROP_DBstring[EOF] schema name
更多详情 ： http://dev.mysql.com/doc/internals/en/com-drop-db.html
删除DB命令包操作
删除DB命令包类
/**
*
* <pre><b>mysql drop db 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 DropDBPacket extends MySQLPacket {
public byte flag; public byte[] schema; @Override
public void read(byte[] data) {
MySQLMessage mm = new MySQLMessage(data);
packetLength = mm.readUB3();
packetId = mm.read();
flag = mm.read(); this.schema = mm.readBytes();
} @Override
public void write(ByteBuffer buffer) {
BufferUtil.writeUB3(buffer, calcPacketSize());
buffer.put(packetId);
buffer.put(COM_DROP_DB);
buffer.put(schema);
} @Override
public int calcPacketSize() { int i = 1;
i += schema.length; return i;
} @Override
protected String getPacketInfo() { return "MySQL Drop DB Packet";
}
}
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