How can I get a count of replies for each thread?

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Hi,

below I have some code that displays the 3 latest threads on a discussion board. Along with an image, the thread name, and the last activity, I want to display a count of the replies associated to that thread.

I have a database table for threads and a database table for replies, and the replies are linked to the threads table (threadID) on a column called replyThreadID (FK to threads.threadID.

PHP

$db = Database::getConnection();
			$query = 'SELECT * FROM threads AS t 
			JOIN profile AS p ON t.threadBy = p.username 
			WHERE t.threadTopic="'.$topic.'" 
			ORDER BY lastActive DESC LIMIT 3';
			$output = $db->query($query);
			$results = $output->fetchAll(PDO::FETCH_ASSOC);
				if (count($results) > 0) {
					echo "<table>\n";
					echo "<tr><th colspan=2>".$topic."</th>
					<th>Replies</th>
					<th>Last activity</th></tr>\n";
					foreach($results as $result){
						$threadID = $result['threadID'];
						//get count of replies for each thread
						$replies = (count());
						$src = $result['image'];
						$image = '<img src="'.$src.'"></img>';
						echo "<tr>\n";
						echo "<td>$image</td>";
						echo "<td>$result[threadName]</td>";
						echo "<td>$replies</td>";
						echo "<td>$result[lastActive]<br>By: $result[threadBy]</td>";
						}
						echo "</tr>\n";
						echo "</table>";
					}
			}

Is it possible to get a count for the amount of replies where the replyThreadID = threadID? Should it be inside or outside the foreach?

Posted 7-Apr-15 2:01am

jba1991

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Sascha Lefèvre 9-Apr-15 10:57am

Did you check out my proposed solution yet?

1 solution

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Sascha Lefèvre · Accepted Answer · 2015-04-07T17:31:00

You can query the amount of replies in your first query (I named the result column "ReplyCount" here):

PHP

$query = 'SELECT *,
          (SELECT Count(replyThreadID) FROM replies WHERE replyThreadID = t.threadID) AS ReplyCount
          FROM threads AS t 
          JOIN profile AS p ON t.threadBy = p.username 
          WHERE t.threadTopic="'.$topic.'" 
          ORDER BY lastActive DESC LIMIT 3';

And then simply read that column as any other.

SQL-Fiddle: http://sqlfiddle.com/#!9/6bd0f/2[^]

By the way, I would suggest you explicitly specify the columns you want to select, instead of using SELECT *