Detailed ping command package and analysis of mysql protocol

git

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

Overview

The mysql client can use the ping command to check the status of the server. Normally, an ok packet will be returned.

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

ping command package

Payload

1              [0e] COM_PING

More details: http://dev.mysql.com/doc/internals/en/com-ping.html

ping Command package class

/**
 * 
 * @author seaboat
 * @date 2016-09-25
 * @version 1.0
 * <pre class="brush:php;toolbar:false"><b>email: </b>849586227@qq.com

*

<b>blog: </b>http://www.php.cn/;/pre>
 * <p>ping command packet.</p>
 */public class PingPacket extends MySQLPacket {
    // payload length is 1,packet id is 0,payload is 0e
    public static final byte[] PING = new byte[] { 1, 0, 0, 0, 14 };    
    @Override
    public int calcPacketSize() {        
    return 1;
    }    @Override
    protected String getPacketInfo() {        
    return "MySQL Ping Packet";
    }

}

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