Question

I have the following simple mysqli php application, which should work fine. $pk is accepted perfectly and is a valid ARTICLE_NO, and the query works perfectly when executed directly by mysql. I have put output statements after every event and all except tetsing while executes. The while loop is never entered, and I am unsure why.

edit: I have narrowed the problem down to the fact that 0 rows are returned, but I have no idea why as the same query in phpmyadmin gives the right result.

edit2: if I get rid of the while loop and just have

    if (!$getRecords->fetch()) {     printf('<p>ErrorNumber: %d\n', $getRecords->errno); } 

It shows that the errno is 0. So no records are fetched, and there is no error, yet it is a valid query.

<?php ini_set('display_errors', '1'); error_reporting(E_ALL); $pk = $_GET['pk']; $con = mysqli_connect('localhost', '', '', ''); if (!$con) {     echo 'Can't connect to MySQL Server. Errorcode: %s\n'. mysqli_connect_error();     exit; } $con->set_charset('utf8'); echo 'test outside loop'; if(1 < 2) {     echo 'test inside loop';     $query1 = 'SELECT ARTICLE_NO FROM AUCTIONS WHERE ARTICLE_NO = ?';     if ($getRecords = $con->prepare($query1)) { echo 'inside second loop';         $getRecords->bind_param('i', $pk); echo 'test after bind param';         $getRecords->execute(); echo 'test after bind execute';         $getRecords->bind_result($ARTICLE_NO); echo 'test after bind result';         while ($getRecords->fetch()) {             echo 'test inside while';             echo '<h1>'.$ARTICLE_NO.'</h1>';         }     } } 

edit:

I tried with this code:

<?php $mysqli = new mysqli('localhost', '', '', ''); $pk = $_GET['pk']; if (mysqli_connect_errno()) {     printf('Connect failed: %s\n', mysqli_connect_error());     exit(); } /* prepare statement */ if ($stmt = $mysqli->prepare('SELECT ARTICLE_NAME, WATCH FROM AUCTIONS WHERE ARTICLE_NO = ? LIMIT 5')) {     $stmt->bind_param('i', $pk);     $stmt->execute();     /* bind variables to prepared statement */     $stmt->bind_result($col1, $col2);     /* fetch values */     while ($stmt->fetch()) {         printf('%s %s\n', $col1, $col2);     }     /* close statement */     $stmt->close(); } /* close connection */ $mysqli->close(); ?> 

This works without $pk, if I take away the parameters it works fine. It is not a problem with getting pk via GET, because if I assign $pk = 1; instead it still fails. 1 is a valid ARTICLE_NO, and SELECT ARTICLE_NAME, WATCH FROM AUCTIONS WHERE ARTICLE_NO = 1 LIMIT 5 works fine in phmyadmin.

edit: the problem was that mysqli could not handle bigint, I am now using k as a string and it works fine.

Answer 1

Check the value of:

$getRecords->num_rows 

which should help reveal whether the earlier SELECT is actually returning any data

You may need to also add:

$getRecords->store_result() 

first to ensure that you’ve the whole query has completed before asking for the number of rows in the result set.

Also – make sure you cast $pk to an integer! It’s possible that the value being passed in is getting mangled.