Detecting error/invalid/illegal queries using PDO driver (MySQL + PHP) - mysql

Question

I just changed all my code from the old mysql driver to PDO.
So far I find that a lot of basic functionalities doesn't exist! Ex. no equivalency to mysql_num_row .. and so on (but that's not the point of this post :/ )
Usually with mysql driver, I'd do:
$result = mysql_query($query);
if(!$result){
displayError(mysql_error());
}
How do you do similar thing using PDO?

Answer 1

Have a look at the documentation here there are 3 modes :
PDO::ERRMODE_SILENT (default)
PDO::ERRMODE_WARNING
PDO::ERRMODE_EXCEPTION
I suggest you enable the last, which causes an exception to be thrown on error :
$pdo = new PDO($dsn,$user,$pass,$options); // Example connection
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
then surround your statement in a try/catch block
try {
// your query here
} catch (PDOException $e) {
echo 'Query failed: ' . $e->getMessage();
}
Separate note - mysql_num_row in PDO :
$sql = "SELECT count(*) FROM `table` WHERE x = y";
$result = $con->prepare($sql);
$result->execute();
$number_of_rows = $result->fetchColumn()

Answer 2

Use try { } catch {}
<?php
$dsn = 'mysql:dbname=testdb;host=127.0.0.1';
$user = 'dbuser';
$password = 'dbpass';
try {
$dbh = new PDO($dsn, $user, $password);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
echo 'Connection failed: ' . $e->getMessage();
}
?>
Reference