Question

Trying to pull fields ‘info’ and ‘date’ from Comment table.

Two Tables:

Php

<?php
$pID2 = filter_input(INPUT_GET, 'pID', FILTER_SANITIZE_NUMBER_INT);
        $username = "###";
        $password = "####";
        $pdo2 = new PDO('mysql:host=localhost;dbname=###', $username, $password);
        $pdo2->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
        $sth2 = $pdo2->prepare('
            SELECT info, date
            FROM Professor, Comment
            WHERE Professor.pID = ?');
        $sth2->execute(array(
            $pID2
        ));
?>

While Statement

while($row = $sth2->fetch(PDO::FETCH_ASSOC)) {  
                echo "<div class='comment'>by Anonymous on {$row['date']}: <br> {$row['info']} </div>";
                }

The problem is, it pulls results, but it shows those two same comments for all the professors. Is there an error here with not calling a unique professor given the pID=[somenumber] in the url??

Answer 1

The actual SQL code should be:-

$sth2 = $pdo2->prepare('
            SELECT info, date
            FROM Comment
            JOIN Professor ON Professor.pID = Comment.pID
            WHERE Comment.pID = ?');

You need to put a JOIN statement with the Professor table.

Hope it helps.

Update:-
Another checking should have been provided (as mentioned by the OP in the comment). If no rows are found, then the row count checking should be applied as:-

if ($sth2->rowCount()) {
  while($row = $sth2->fetch(PDO::FETCH_ASSOC)) {
    echo "<div class='comment'>by Anonymous on {$row['date']}: <br> {$row['info']} </div>";
  }
}
else {
  echo "<div class='unavailable'>No Comments Found!</div>";
}

It’s always good to have this sort of a checking of row counts. Better checking than falling for coding errors. Best of Luck!