Discuz!6.10，attachments表

请问每个字段代表什么意思？

1. DROP TABLE IF EXISTS `pda_attachments`;
   
2. CREATE TABLE `pda_attachments` (
   
3.   `aid` mediumint(8) unsigned NOT NULL auto_increment,
   
4.   `tid` mediumint(8) unsigned NOT NULL default '0',
   
5.   `pid` int(10) unsigned NOT NULL default '0',
   
6.   `dateline` int(10) unsigned NOT NULL default '0',
   
7.   `readperm` tinyint(3) unsigned NOT NULL default '0',
   
8.   `price` smallint(6) unsigned NOT NULL default '0',
   
9.   `filename` char(100) NOT NULL default '',
   
10.   `description` char(100) NOT NULL default '',
    
11.   `filetype` char(50) NOT NULL default '',
    
12.   `filesize` int(10) unsigned NOT NULL default '0',
    
13.   `attachment` char(100) NOT NULL default '',
    
14.   `downloads` mediumint(8) NOT NULL default '0',
    
15.   `isimage` tinyint(1) unsigned NOT NULL default '0',
    
16.   `uid` mediumint(8) unsigned NOT NULL default '0',
    
17.   `thumb` tinyint(1) unsigned NOT NULL default '0',
    
18.   `remote` tinyint(1) unsigned NOT NULL default '0',
    
19.   PRIMARY KEY  (`aid`),
    
20.   KEY `tid` (`tid`),
    
21.   KEY `pid` (`pid`,`aid`),
    
22.   KEY `uid` (`uid`)
    
23. ) ENGINE=MyISAM AUTO_INCREMENT=5 DEFAULT CHARSET=gbk;
    

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这是一个附件的数据：

1. INSERT INTO `pda_attachments` VALUES (1,16,16,1211690825,0,0,'crazybubbles_1.2.rar','','application/octet-stream',374691,'day_080525/20080525_335ad48cc84c49f6b292MBWJMACCDNLv.rar',0,0,1,0,0)

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配合以上字段怎么解释？