Why Are My PDO Error Messages Empty?

Extracting Error Messages from PDO

When attempting to obtain an error message from a PDO exception, it can be frustrating to encounter empty results. This question delves into the underlying issue and provides a solution to this problem.

Despite setting the error mode to warning, the PDO statement and its error information return empty arrays. The issue stems from the fact that setAttribute affects PDO's behavior during query execution, not during statement preparation.

In the case of emulated prepared statements, the prepare() function does not interact with the database server, resulting in no error checking. However, when using native prepared statements, as supported by MySQL since version 4.1, setting the error mode to exception should trigger an exception upon query execution.

To achieve this, use the following code:

$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

By switching to native prepared statements and setting the error mode correctly, you should now be able to obtain informative error messages from your PDO exceptions.

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