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Bug #72368 PdoStatement->execute() fails but does not throw an exception
Submitted: 2016-06-09 09:47 UTC Modified: 2016-07-10 05:34 UTC
Avg. Score:3.4 ± 1.5
Reproduced:4 of 5 (80.0%)
Same Version:0 (0.0%)
Same OS:2 (50.0%)
From: fredrik at neam dot se Assigned:
Status: Open Package: PDO MySQL
PHP Version: 7.0.7 OS: Any
Private report: No CVE-ID: None
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 [2016-06-09 09:47 UTC] fredrik at neam dot se
PdoStatement->execute() fails but does not throw an exception when supplying parameters to execute() whilst not using any placeholders in the query.

Tested on PHP 7.0.7, 5.6.20 and HHVM 3.13.1

Test script:
$dbh = new PDO('###');
$params = [":bar" => 1];
$sql = "SELECT 1";
$stmt = $dbh->prepare($sql);
$result = $stmt->execute($params);

Expected result:
Either ->execute() should return true and the result set be populated, or an exception should be thrown (like it does for the below case):

$dbh = new PDO('###');
$params = [":bar" => 1];
$sql = "SELECT :foo";
$stmt = $dbh->prepare($sql);
$result = $stmt->execute($params);

Actual result:
$result is false, but an exception is not thrown. The result set is empty.

This is problematic since when the error mode is set to PDO::ERRMODE_EXCEPTION, it is fair to assume that failed statements results in thrown exceptions, so that the return variable must not be checked after each usage of ->execute(). 


bug72368_test (last revision 2016-07-10 05:35 UTC by

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 [2016-07-10 05:34 UTC]
-Package: PDO related +Package: PDO MySQL -Operating System: Debian Jessie +Operating System: Any
 [2016-07-10 05:34 UTC]
Moving to pdo_mysql as both pdo_sqlite and pdo_pgsql raise an exception, as expected. I haven't tested the other drivers, but I will attach a patch that adds a PDO Common test for the issue.
 [2016-07-10 05:35 UTC]
The following patch has been added/updated:

Patch Name: bug72368_test
Revision:   1468128909
 [2019-06-12 21:48 UTC] dan dot mara at gmail dot com
I experience this issue as well with dblib. Using SQL Server Profiler, I confirmed that it as indeed triggering exceptions at the DB level, but they are not being thrown by PDO. It seems inconsistent, in that I only get exceptions when executing a statement where I did something like forgetting to bind a parameter.

The following should demontrate the issue:

$conn = new PDO('dblib:host=XXX;dbname=XXX', 'REDACTED', 'REDACTED');

$stmt = $conn->prepare("SELECT thistable FROM doesnotexist");
try {
} catch (Exception $ex) {
	die("I am never reached");

The above WILL reach SQL Server, and emit an EventClass of "Exception", but PDO does not trickle it down to a PDOException. It's extremely unreliable.
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