PHP PDO placeholders will not DELETE
Question
I have tried to delete a record in table 'telefoonnummers'. But nothing changes. What is the error below?
<HTML>
<?php
require_once 'db_config.php';
//get data last page
$indexnr = $_GET['id'];
$sth = $dbh->prepare("DELETE FROM telefoonnummers WHERE index = :indexnr");
$sth->bindValue(':indexnr', $indexnr, PDO::PARAM_INT);
$count = $sth->execute();
if($count == 1) {
print "One record deleted!<br>";
}
else
{
print "None record deleted!";
}
//Back to first page
?>
<a href="admin.php">Back</a>
</HTML>
2 answers
solution1
1 ACCPTED 2015-05-07 22:08:49
Some basic debugging seems to be in order here -- check to see if the query worked. I don't see anything obviously wrong with your code.
try {
$count = $sth->execute();
} catch (PDOException $e) {
// do error handling
var_dump($e); // use only for debug
}
echo $_GET['id']; to verify that you're pulling the the right information from GET .
echo $count; to verify that you're making a proper comparison.
Either way, it's good practice to have your critical PDO queries wrapped in a try/catch.
solution2
0 2015-05-07 22:27:01
object(PDOException)#3 (8) { ["message":protected]=> string(213) "SQLSTATE[42000]:
Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'index = '4'' at line 1"
["string":"Exception":private]=> string(0) "" ["code":protected]=> string(5) "42000" ["file":protected]=> string(50) "C:\USBwebserver\root\PhpProjectWeek5\verwijder.php" ["line":protected]=> int(14) ["trace":"Exception":private]=> array(1) { [0]=> array(6) { ["file"]=> string(50)
"C:\USBwebserver\root\PhpProjectWeek5\verwijder.php" ["line"]=> int(14) ["function"]=> string(7) "execute" ["class"]=> string(12) "PDOStatement" ["type"]=> string(2) "->" ["args"]=> array(0) { } } } ["previous":"Exception":private]=> NULL ["errorInfo"]=> array(3) { [0]=> string(5) "42000" [1]=> int(1064) [2]=> string(157) "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'index = '4'' at line 1" } }
Notice: Undefined variable: count in C:\\USBwebserver\\root\\PhpProjectWeek5\\verwijder.php on line 21 None record deleted! Back
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