匿名通过本文主要向大家介绍了mysql ，ResultsetRow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
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<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 |
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><b>resultset row 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 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";
}
}以上就是mysql 协议的ResultsetRow包及解析的内容，更多相关内容请关注微课江湖（）！