ResultsetRow package and analysis of mysql protocol

git

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

Overview

The ResultsetRow package is part of the package when the server returns the ResultSet and is used to describe the row records of the result set.

mysql communication message structure

##string payloadMessage body, the length is the previously specified payload length

Type	Name	Description
int<3>	payload length	Stored according to the least significant byte first, 3-byte payload and 1-byte sequence number combination Into the message header
int<1>	sequence number

ResultsetRow package

Payload

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

More details: http://dev.mysql.com/doc/internals/en/com-query-response.html#text-resultset

ResultsetRow package class

/**
 * 
 * <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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