匿名通过本文主要向大家介绍了mysql ，ColumnCount等相关知识,希望本文的分享对您有所帮助
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 | |
| string | payload | 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:///;/pre>
* @version 1.0
* @see http:///
*/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";
}
}以上就是详细介绍mysql 协议的ColumnCount包及解析的内容，更多相关内容请关注微课江湖（）！