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PHP Integrating PHP with Databases Querying the Database with PHP Querying the Database

Posted by Leon Segal
Leon Segal
14,754 Points

try catch block not working

When I try to test if the try catch block is working, only a warning is thrown up but it doesn't stop the code running:

Output

  • Connection Succeeded

Warning: PDO::query(): SQLSTATE[HY000]: General error: 1 no such table: Mediaaa in /var/www/html/integrating_php_with_databases_s1v3/inc/connection.php on line 14

  • Retrieved Results

Code

<?php
// Database connection:
try {
  $db = new PDO("sqlite:".__DIR__."/database.db");
  $db -> setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
  echo "- Connection Succeeded<br>";
} catch (Exception $e) {
  echo "Unable to connect: ".$e->getMessage();
  exit;
} // try

// Data retrieval:
try {
  $results = $db -> query('SELECT * FROM Mediaaa');
  echo "- Retrieved Results<br>";
} catch (Exception $e) {
  echo "Foobar";
  exit;
} // try

After a quick google search, I discovered this is normal for php(!).

Question

How can I test my try catch block in that case then? Do I have to write an error handler, or can I manipulate the code so that only an exception is thrown?

Pirvan Marian
Pirvan Marian
14,609 Points

Change this line of code 

$db ->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);

to

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

You have set the error mode of the PDO object to send warnings if something goes wrong, than throwing exceptions.

You can find a lot more information reading the PHP manual, http://php.net/manual/en/pdo.setattribute.php

From what we can see, we have three options for setting the error mode:

PDO::ERRMODE_SILENT: Just set error codes.

PDO::ERRMODE_WARNING: Raise E_WARNING.

PDO::ERRMODE_EXCEPTION: Throw exceptions. ( this one is used for throwing exceptions )

3 Answers

Jason Cook
Jason Cook
11,403 Points
Jason Cook
Jason Cook
11,403 Points

There are two things you'll need to change, to resolve this issue.

  1. Change the ERRMODE_WARNING attribute to ERRMODE_EXCEPTION
  2. Add a line of code afterwards (such as my example below) that will throw an exception.

Below, you'll find a code block with a modified version that will solve your problem.

Modified Code Below

<?php
// Database connection:
try {
    $db = new PDO("sqlite:".__DIR__."/database.db");
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $db->prepare('SELECT id FROM non_existing_table'); //This statement will fail, throwing exception
    echo "- Connection Succeeded<br>";
} catch (Exception $e) {
    echo "Unable to connect: ".$e->getMessage();
    exit;
} // try

After executing this code, you should see the following output on your screen:

Unable to connect: SQLSTATE[HY000]: General error: 1 no such table: non_existing_object

I hope this helps! Happy coding :-)

Asma Al-Marrikhi
Asma Al-Marrikhi
45,524 Points
Asma Al-Marrikhi
Asma Al-Marrikhi
45,524 Points

if you use "treehouse workspaces" delete it and launch it again from last video ... it will work .. i had this problem .. and it is work for me :)

Jose Vaca Cipres
Jose Vaca Cipres
10,724 Points
Jose Vaca Cipres
Jose Vaca Cipres
10,724 Points

Warning: PDO::query(): SQLSTATE[HY000]: General error: 1 no such table: Mediaaa in /var/www/html/integrating_php_with_databases_s1v3/inc/connection.php on line 14

This means that you don't have a table called 'Mediaaa' in your database. So, PHP can't a query correctly.