详细介绍mysql 协议的EOF包及解析

git

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

概况

mysql的EOF包用于标明查询结果的结尾。

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

EOF包

Payload

Type    Name    Description
int<1>  header  [fe] EOF header
if capabilities & CLIENT_PROTOCOL_41 {  
int<2>    warnings    number of warnings  
int<2>    status_flags    Status Flags
}

更多详情 ： http://dev.mysql.com/doc/internals/en/packet-EOF_Packet.html

EOF包操作

1. EOF包类

/**
 * 
 * <pre><b>mysql eof packet.</b></pre>
 * @author 
 * <pre>seaboat</pre>
 * <pre><b>email: </b>[e-mail]</pre>
 * <pre><b>blog: </b>http://www.php.cn/;/pre>
 * @version 1.0
 * @see http://www.php.cn/
 */public class EOFPacket extends MySQLPacket {

    public byte header = (byte) 0xfe;    
    public int warningCount;    
    public int status = 2;    
    @Override
    public void read(byte[] data) {
        MySQLMessage mm = new MySQLMessage(data);
        packetLength = mm.readUB3();
        packetId = mm.read();
        header = mm.read();
        warningCount = mm.readUB2();
        status = mm.readUB2();
    }    @Override
    public void write(ByteBuffer buffer) {        
    int size = calcPacketSize();
        BufferUtil.writeUB3(buffer, size);
        buffer.put(packetId);
        buffer.put(header);
        BufferUtil.writeUB2(buffer, warningCount);
        BufferUtil.writeUB2(buffer, status);
    }    @Override
    public int calcPacketSize() {        
    return 5;
    }    
    @Override
    protected String getPacketInfo() {        
    return "MySQL EOF Packet";
    }

}

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