mysql 协议的ResultsetRow包及解析

if(NULL){  0xfb}else{
  Protocol::LengthEncodedString}

/**
 * 
 * <pre><b>resultset row packet.</b></pre>
 * @author 
 * <pre>seaboat</pre>
 * <pre><b>email: </b>849586227@qq.com</pre>
 * <pre><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";
    }

}