mysql 协议的query包及解析

git

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

概况

mysql客户端可以用query包向服务端发送一个基于文本查询。

mysql通信报文结构

query包

Payload

1              [03] COM_QUERY
string[EOF]    the query the server shall execute

更多详情 ： https://dev.mysql.com/doc/internals/en/com-query.html

query包类

/**
 *
 * <pre><b>mysql query 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-query.html
 */
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";
    }

}

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