How could I improve this code

teynon · July 11, 2011

Ok, i further modified the query a little bit to match the code.

This code:

<?php
$id_link=mysql_connect("localhost", "root", "");
mysql_select_db("testing");

$sql="SELECT 
t3.name as Name,
t1.name as SubName, 
t1.description as SubDescr,
t4.topic_name as TopicName, 
t4.id as TopicId,
t4.date as ReplyDate,
t4.time as ReplyTime, 
t5.username as Username,
t5.id as UserID,
(SELECT COUNT(*) FROM forum_topics as t6 WHERE t6.sub_cat_id = t1.id) as Topics,
(SELECT COUNT(*) FROM forum_replys as t7 WHERE t7.sub_cat_id = t1.id) as Replies

FROM 
forum_cats as t3
	LEFT JOIN forum_subs as t1 
		ON t3.name = t1.cat 
	LEFT JOIN forum_topics as t2 
		ON t2.sub_cat_id = t1.id 
	LEFT JOIN forum_replys as t4 
		ON t4.sub_cat_id = t1.id 
	LEFT JOIN users as t5 
		ON t5.username = t4.username 
GROUP BY t1.name 
ORDER BY 
t3.id ASC, t1.name ASC, t4.id DESC";

$lastBoard="";
if ($query=@mysql_query($sql)) {
	if (@mysql_num_rows($query) > 0) {

		?>
		<div id="forumContainer">
		<div id="forumHolder">
		<?php

		while ($req=@mysql_fetch_array($query)) {
			if ($req['Name'] != $lastBoard) {
				$lastBoard=$req['Name'];
				?><div class="forumCats"><?php echo $req['Name'];?></div><?php
			}
			?>
			<div class="forumSubs">
				<div class="subsLeft"><a href="view.php?id=<?php echo $req['TopicId'];?>&currentpage=1">
				<?php echo $req['SubName'];?></a><br />
				<span><?php echo $req['SubDescr'];?></span>
				</div>


				<div class="subsRightH">
					<div class="subsRLeft">
					Posts: <?php echo $req['Replies'];?><br />
					Topics: <?php echo $req['Topics'];?>
					</div>

					<div class="subsRRight">
					<?php
					if ($req['Replies'] > 0) {
						?>
						Last post by: <a href="profile.php?id=<?php echo $req['UserID'];?>"><?php echo $req['Username'];?></a><br />
						in: <a href="topic.php?id=<?php echo $req['TopicId'];?>&currentpage=1"><?php echo $req['TopicName'];?></a><br />
						<?php
                              
						if ($req['ReplyDate'] == date('d/m/Y')) {
							echo "<strong>Today</strong> at {$req['ReplyTime']}";
						}
						else {
							echo "on {$req['ReplyDate']} at {$req['ReplyTime']}";
						}
					}
					else {
						echo "No posts";
					}
					?>
					</div>
				</div>
				<div class="clearfloat"></div>
			</div>
			<?php
		}
		?></div></div><?php
	}
}
else {
	echo mysql_error();
}
?>

outputs the exact same thing as your code:

<?php
$id_link=mysql_connect("localhost", "root", "");
mysql_select_db("testing");

$catsQ = mysql_query("SELECT * FROM `forum_cats` ORDER BY `id` ASC");
$catsF = mysql_fetch_assoc($catsQ);
?>

<div id="forumContainer">
   <div id="forumHolder">
      <?php
         $catsQ = mysql_query("SELECT * FROM `forum_cats`");
         $catsF = mysql_fetch_assoc($catsQ);
         
         do
         {
            echo '<div class="forumCats">'.$catsF['name'].'</div>';
            
            $subsQ = mysql_query("SELECT * FROM `forum_subs` WHERE `cat`='".$catsF['name']."'");
            $subsF = mysql_fetch_assoc($subsQ);
            
            do
            {
               $topicQ = mysql_query("SELECT * FROM `forum_topics` WHERE `sub_cat_id`='".$subsF['id']."'");
               $topicR = mysql_num_rows($topicQ);
               
               $replyQ = mysql_query("SELECT * FROM `forum_replys` WHERE `sub_cat_id`='".$subsF['id']."' ORDER BY `id` DESC");
               $replyF = mysql_fetch_assoc($replyQ);
               $replyR = mysql_num_rows($replyQ);

               $uidQ = mysql_query("SELECT * FROM `users` WHERE `username`='".$replyF['username']."'");
               $uidF = mysql_fetch_assoc($uidQ);

               echo '<div class="forumSubs">
                        <div class="subsLeft"><a href="view.php?id='.$subsF['id'].';currentpage=1">'.$subsF['name'].'</a><br /><span>'.$subsF['description'].'</span></div>
                        <div class="subsRightH">
                           <div class="subsRLeft">Posts: '.$replyR.'<br />Topics: '.$topicR.'</div>
                           <div class="subsRRight">';
                           
                           if($replyR > 0)
                           {
                              echo 'Last post by: <a href="profile.php?id='.$uidF['id'].'">'.$replyF['username'].'</a><br />in: <a href="topic.php?id='.$replyF['topic_id'].';currentpage=1">'.$replyF['topic_name'].'</a><br />';
                              if($replyF['date'] == date('d/m/Y'))
                              {
                                 echo '<strong>Today</strong> at '.$replyF['time'];
                              } else {
                                 echo 'on '.$replyF['date'].' at '.$replyF['time'];
                              }
                           } else {
                              echo 'No posts';
                           }
               echo        '</div>
                        </div>
                        <div class="clearfloat"></div>
                     </div>
                     ';
            } while($subsF = mysql_fetch_assoc($subsQ));

         } while($catsF = mysql_fetch_assoc($catsQ));
      ?>
   </div>
</div>

However, my code (top) only uses one query.

teynon · July 11, 2011

Correction (Forgot sub category id / link)

<?php
$id_link=mysql_connect("localhost", "root", "");
mysql_select_db("testing");

$sql="SELECT 
t3.name as Name,
t1.name as SubName,
t1.id as SubId,
t1.description as SubDescr,
t4.topic_name as TopicName, 
t4.id as TopicId,
t4.date as ReplyDate,
t4.time as ReplyTime, 
t5.username as Username,
t5.id as UserID,
(SELECT COUNT(*) FROM forum_topics as t6 WHERE t6.sub_cat_id = t1.id) as Topics,
(SELECT COUNT(*) FROM forum_replys as t7 WHERE t7.sub_cat_id = t1.id) as Replies

FROM 
forum_cats as t3
	LEFT JOIN forum_subs as t1 
		ON t3.name = t1.cat 
	LEFT JOIN forum_topics as t2 
		ON t2.sub_cat_id = t1.id 
	LEFT JOIN forum_replys as t4 
		ON t4.sub_cat_id = t1.id 
	LEFT JOIN users as t5 
		ON t5.username = t4.username 
GROUP BY t1.name 
ORDER BY 
t3.id ASC, t1.name ASC, t4.id DESC";

$lastBoard="";
if ($query=@mysql_query($sql)) {
	if (@mysql_num_rows($query) > 0) {

		?>
		<div id="forumContainer">
		<div id="forumHolder">
		<?php

		while ($req=@mysql_fetch_array($query)) {
			if ($req['Name'] != $lastBoard) {
				$lastBoard=$req['Name'];
				?><div class="forumCats"><?php echo $req['Name'];?></div><?php
			}
			?>
			<div class="forumSubs">
				<div class="subsLeft"><a href="view.php?id=<?php echo $req['SubId'];?>&currentpage=1">
				<?php echo $req['SubName'];?></a><br />
				<span><?php echo $req['SubDescr'];?></span>
				</div>


				<div class="subsRightH">
					<div class="subsRLeft">
					Posts: <?php echo $req['Replies'];?><br />
					Topics: <?php echo $req['Topics'];?>
					</div>

					<div class="subsRRight">
					<?php
					if ($req['Replies'] > 0) {
						?>
						Last post by: <a href="profile.php?id=<?php echo $req['UserID'];?>"><?php echo $req['Username'];?></a><br />
						in: <a href="topic.php?id=<?php echo $req['TopicId'];?>&currentpage=1"><?php echo $req['TopicName'];?></a><br />
						<?php
                              
						if ($req['ReplyDate'] == date('d/m/Y')) {
							echo "<strong>Today</strong> at {$req['ReplyTime']}";
						}
						else {
							echo "on {$req['ReplyDate']} at {$req['ReplyTime']}";
						}
					}
					else {
						echo "No posts";
					}
					?>
					</div>
				</div>
				<div class="clearfloat"></div>
			</div>
			<?php
		}
		?></div></div><?php
	}
}
else {
	echo mysql_error();
}
?>

MargateSteve · July 12, 2011

Sorry to hijack the thread but something in here was new to me.

I noticed the use of @mysql_num_rows in teynon's code. I always just use mysql_num_rows without the @ in front of it.

Does the @ do anything different to the execution?

Steve

teynon · July 12, 2011

@ is error suppression. Basically if I did $query="SELECT * FROM BLAH WTF THIS IS NOT A SQL QUERY"; mysql_query($sql); and your server has warnings enabled, you could have errors pop up and reveal things you might not want to reveal. I just formed a habit over time of error suppression so that end users don't see them.

http://php.net/manual/en/language.operators.errorcontrol.php

KevinM1 · July 12, 2011

@thorpe, force of habit. I don't like errors / warnings in production :/

Wouldn't the solution be to fix the errors rather than squelch them?

teynon · July 12, 2011

The errors are fixed. But you're missing the point. @ is basically me being paranoid. Is there a downside to this other than the fact that the user doesn't see the error message?

trq · July 12, 2011

@thorpe, force of habit. I don't like errors / warnings in production :/

Even without the error suppression, there was no code in your example that would cause an error. Using error suppression would just slow down the process.

Andy11548 · July 12, 2011

Thank you teynon, that works great, I'll revise the code and keep it into account for my further coding.

Thank you all for you help.

~Andy.

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