Home >Database >Mysql Tutorial >Detailed analysis of the query package and analysis of the mysql protocol
https://github.com/sea-boat/mysql-protocol
The mysql client can use the query package to send a text-based query to the server.
Type | Name | Description |
---|---|---|
int5bdf4c78156c7953567bb5a0aef2fc53 | payload length | Stored according to the least significant byte first, 3-byte payload and 1-byte sequence number combination Into the message header |
intf35d6e602fd7d0f0edfa6f7d103c1b57 | sequence number | |
payload | Message body, the length is the previously specified payload length |
Payload
1 [03] COM_QUERYstring[EOF] the query the server shall executeMore details: https://dev.mysql.com/doc/internals/en/com-query.htmlquery package Class
/** * * <pre class="brush:php;toolbar:false"><b>mysql query 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 QueryPacket extends MySQLPacket { public byte flag; public byte[] message; public void read(byte[] data) { MySQLMessage mm = new MySQLMessage(data); packetLength = mm.readUB3(); packetId = mm.read(); flag = mm.read(); message = mm.readBytes(); } public void write(ByteBuffer buffer) { int size = calcPacketSize(); BufferUtil.writeUB3(buffer, size); buffer.put(packetId); buffer.put(COM_QUERY); buffer.put(message); } @Override public int calcPacketSize() { int size = 1; if (message != null) { size += message.length; } return size; } @Override protected String getPacketInfo() { return "MySQL Query Packet"; } }