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详细介绍mysql协议的ColumnCount包及解析

时间:2021-07-01 10:21:17 帮助过:42人阅读


git

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

概况

ColumnCount包属于服务端返回ResultSet时的其中一部分包。

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
stringpayload报文体,长度即为前面指定的payload长度

ColumnCount包

Payload

Protocol::LengthEncodedInteger

更多详情 : http://dev.mysql.com/doc/internals/en/com-query-response.html#packet-ProtocolText::ResultsetRow

ColumnCount包类

/**
 * 
 * <pre><b>column count 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 ColumnCountPacket extends MySQLPacket {

    public int columnCount;    
    public void read(byte[] data) {
        MySQLMessage mm = new MySQLMessage(data);        
        this.packetLength = mm.readUB3();        
        this.packetId = mm.read();        
        this.columnCount = (int) mm.readLength();
    }    
    @Override
    public void write(ByteBuffer buffer) {        
    int size = calcPacketSize();
        BufferUtil.writeUB3(buffer, size);
        buffer.put(packetId);
        BufferUtil.writeLength(buffer, columnCount);
    }    
    @Override
    public int calcPacketSize() {        
    int size = BufferUtil.getLength(columnCount);        
    return size;
    }    @Override
    protected String getPacketInfo() {        
    return "MySQL Column Count Packet";
    }

}

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