git
https://github.com/sea-boat/mysql-protocol
概况
ResultsetRow包属于服务端返回ResultSet时的其中一部分包，用于描述结果集的行记录。
mysql通信报文结构
| 类型 | 名字 | 描述 |
|---|---|---|
| int | 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 | 序列号 | |
| string | payload | 报文体，长度即为前面指定的payload长度 |
ResultsetRow包
Payload
if(NULL){ 0xfb}else{ Protocol::LengthEncodedString}
更多详情 ： http://dev.mysql.com/doc/internals/en/com-query-response.html#text-resultset
ResultsetRow包类
/** * * <pre class="brush:php;toolbar:false"><b>resultset row 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 ResultsetRowPacket extends MySQLPacket { private static final byte NULL_MARK = (byte) 251; public int columnCount; public List<byte[]> columnValues; public ResultsetRowPacket() { } public ResultsetRowPacket(int columnCount) { this.columnCount = columnCount; } @Override public void read(byte[] data) { MySQLMessage mm = new MySQLMessage(data); packetLength = mm.readUB3(); packetId = mm.read(); for (int i = 0; i < columnCount; i++) { columnValues.add(mm.readBytesWithLength()); } } @Override public void write(ByteBuffer buffer) { BufferUtil.writeUB3(buffer, calcPacketSize()); buffer.put(packetId); for (int i = 0; i < columnCount; i++) { byte[] fv = columnValues.get(i); if (fv == null) { buffer.put(NULL_MARK); } else { BufferUtil.writeLength(buffer, fv.length); buffer.put(fv); } } } @Override public int calcPacketSize() { int size = 0; for (int i = 0; i < columnCount; i++) { byte[] v = columnValues.get(i); size += (v == null || v.length == 0) ? 1 : BufferUtil.getLength(v); } return size; } @Override protected String getPacketInfo() { return "MySQL Resultset Row Packet"; } }
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