詳細介紹mysql 協議的ColumnCount包及解析

git

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

概況

ColumnCount包屬于服務端返回ResultSet時的其中一部分包。

mysql通信報文結構

類型 名字 描述
int payload長度 按照the least significant byte first存儲,3個字節的payload和1個字節的序列號組合成報文頭
int 序列號
string payload 報文體,長度即為前面指定的payload長度

ColumnCount包

Payload

Protocol::LengthEncodedInteger

更多詳情 :?http://dev.mysql.com/doc/internals/en/com-query-response.html#packet-ProtocolText::ResultsetRow

ColumnCount包類

/**  ?*?  ?*?<pre class="brush:php;toolbar:false"><b>column count packet.</b>

?*?@author? ?*?

seaboat

?*?

<b>email: </b>849586227@qq.com

?*?

<b>blog: </b>http://www.php.cn/;/pre>   * @version 1.0   * @see http://www.php.cn/   */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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