mysql协议的初始化DB命令包及解析

git

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

概况

mysql连接如果想要改变该连接默认的schema，则客户端可以向服务端发送初始化DB命令包。

mysql通信报文结构

初始化DB命令包

Payload

1              [02] COM_INIT_DBstring[EOF]    schema name

更多详情 ： http://dev.mysql.com/doc/internals/en/com-init-db.html

初始化命令包操作

1. 初始化命令包

/**
 * 
 * @author seaboat
 * @date 2016-09-25
 * @version 1.0
 * <pre><b>email: </b>849586227@qq.com</pre>
 * <pre><b>blog: </b>http://www.gxlcms.com/;/pre>
 * <p>mysql init db packet.</p>
 */public class InitDBPacket extends MySQLPacket {
    public byte[] schema;    public void read(byte[] data) {
        MySQLMessage mm = new MySQLMessage(data);
        packetLength = mm.readUB3();
        packetId = mm.read();
        mm.read(); // skip COM_INIT_DB
        this.schema = mm.readBytes();
    }    public void write(ByteBuffer buffer) {
        BufferUtil.writeUB3(buffer, calcPacketSize());
        buffer.put(packetId);
        buffer.put(COM_INIT_DB);
        buffer.put(schema);
    }    @Override
    public int calcPacketSize() {        int i = 1;
        i += schema.length;        return i;
    }    @Override
    protected String getPacketInfo() {        return "MySQL Init DB Packet";
    }

}

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