我有三个表(用户,帖子,评论)加入(对于一个ajax驱动的社交网络我正在做的学位)。
到目前为止一直很好但是当我循环浏览它们时,除了一个之外我得到了所有结果。对帖子发表评论的人(存储在评论表中)的引用仅作为数字ID(应该加入用户表,但我的联接显然无法正常工作!)。
非常感谢任何帮助!可能很简单,因为我在这个PHP / mysql游戏中仍然是新手!
MySQL表:
CREATE TABLE `post` (
`pid` int(10) NOT NULL AUTO_INCREMENT,
`uid` int(10) NOT NULL,
`post` text NOT NULL,
`pid_imageurl` varchar(100) NOT NULL,
`likes` int(10) NOT NULL,
PRIMARY KEY (`pid`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=5
CREATE TABLE `user` (
`uid` int(10) NOT NULL AUTO_INCREMENT,
`name` varchar(20) NOT NULL,
`password` varchar(20) NOT NULL,
`uid_imageurl` varchar(100) NOT NULL,
`joindate` varchar(11) NOT NULL,
PRIMARY KEY (`uid`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=9 ;
CREATE TABLE `comments` (
`cid` int(10) NOT NULL AUTO_INCREMENT,
`comment_pid` int(10) NOT NULL,
`comment_uid` int(10) NOT NULL,
`comment` text NOT NULL,
PRIMARY KEY (`cid`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;
代码:
$sql = "SELECT post.post, post.pid_imageurl, post.likes, user.name, comments.comment,
user.uid_imageurl, comments.comment_uid
FROM post
INNER JOIN user
ON post.uid=user.uid
LEFT JOIN comments
ON comments.comment_pid=post.pid
AND user.uid=comments.comment_uid
";
$result = mysql_query($sql);
while($row=mysql_fetch_assoc($result)){?>
<ul>
<li>User Profile image here:<? echo $row['uid_imageurl']; ?></li>
<li>Post:<? echo $row['post']; ?></li>
<li>Post by:<? echo $row['name']; ?></li>
<li>Post images:<? echo $row['pid_imageurl']; ?></li>
<li>post has: <? echo $row['likes']; ?> likes.</li>
<li><? echo $row['comment']; ?></li>
<li>by: <? echo $row['comment_uid']; ?></li>
<!--This is only output as a stored id no rather than users name--!>
</ul>
<?}
?>
答案 0 :(得分:0)
首先,您的查询应为:
SELECT
p.post,
p.pid_imageurl,
p.likes,
u.name,
c.comment,
u.uid_imageurl,
cu.name as CommentName
FROM
post p
INNER JOIN user u ON
p.uid=u.uid
LEFT JOIN comments c ON
c.comment_pid=post.pid
left join user cu on
c.comment_uid = cu.uid
$row['comment_uid']
应该成为$row['CommentName']
。
您的原始查询只是抓取原始海报所做的评论(您的加入条件)。您想再次加入user
表格以获取评论海报,而不是原始海报。