mysql 協定的ResultsetRow套件及解析

git

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

概況

#ResultsetRow包屬於服務端傳回ResultSet時的其中一部分包，用於描述結果集的行記錄。

mysql通訊封包結構

##string payload封包文體，長度即為前面指定的payload長度

類型	名字	描述
#int<3>	payload長度	#按照the least significant byte first存儲，3個字節的payload和1個字節的序號組合成報文頭
int<1>	#序號

ResultsetRow套件

############### ###Payload#########

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

###更多詳情： http://dev.mysql.com/doc/internals/en/com-query-response.html#text-resultset## ####ResultsetRow套件類別###

/**
 * 
 * <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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