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  • I'm continuing to struggle with xPDO connections to a foreign database in a snippet.

    This works fine as code inline:

    $dsn = 'mysql:host=localhost; dbname=database; port=3306; charset=utf8';
    $xpdo = new xPDO($dsn,'username','password');
    echo $o=($xpdo->connect()) ? 'Connected<br><br>' : 'Not Connected<br><br>';
    $results = $xpdo->query("SELECT * FROM `table` LIMIT 20");
    while ($row = $results->fetch(PDO::FETCH_ASSOC)) {
      $output .= $modx->getChunk('test', $row);
    return $output;

    But when I put the connection script into a snippet 'pdoConnect'

    define('MODX_CORE_PATH', '/core/');
    require_once MODX_CORE_PATH . 'model/modx/modx.class.php';
    $dsn = 'mysql:host=localhost; dbname=database; port=3306; charset=utf8';
    $xpdo = new xPDO($dsn,'username','password');

    and call it using


    it throws an error

    Fatal error: Call to a member function connect() on a non-object in /home2/pghmin/public_html/core/cache/includes/elements/modsnippet/76.include.cache.php on line 22

    Modx 2.2.14 and 2.5.0 same problem.

    Seems trivial but I can't find a solution
    • If it's in a snippet, $modx and $xpdo are already set up for you, and are connected to the MODX database. You generally don't want to mess with them when connecting to a foreign DB.

      Since your code is using PDO, I would avoid the overhead of including the MODX class file and instantiating a second copy of xPDO. You should be able to just create a new PDO instance that connects to the foreign database and query it. $modx and $xpdo will still be available if you need them for something related to the MODX DB.

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      • Thanks for your reply Bob. I fiddled with the code and ditched xPDO for a straight PDO connection.

        Once again it works fine if I have it all in the one snippet along with the query. But if I separate out the connection string and call it using $modx->runSnippet('pdoConnect'); I get the same error.

        I'm starting to think there might be something wrong with my usage of $modx->runSnippet. My expectation was that it's functionally equivalent to a require statement, but perhaps this is not the case?

        e.g. if I use require_once('assets/connections/test.php'); it works as expected so maybe that's the way to go. [ed. note: grogorio last edited this post 2 years, 2 months ago.]
        • I haven't looked lately, but my recollection is that runSnippet() just sets the properties included in the second argument (if any) and "includes" the code of the snippet. I could be wrong.

          I can't think of any reason why it would be different, unless you are using $modx or $xpdo as variables in your code.

          OTOH, using require_once would likely be faster than runSnippet() anyway.

          It would be faster yet (and would probably be more graceful in case of an error), to use "include" and check a return value from the snippet to see if the include succeeded.

          $returnVal = include 'MySnippetFile';

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            MODX info for everyone:
            My MODX Extras
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          • I came back to this subject while working on another project and found a solution for my case, i.e. connecting to foreign databases.

            It was just a matter of storing the connection code in a regular php file (for example dbConnect.php) and then calling that in the snippet like so:

            require "assets/connections/dbConnect.php";

            Too easy
            • Better, you put this file at a more secure place, for example in your core/components/yourcomponent/ - directory, than under assets.
              Hopefully you've hardened your installation and have you core-directory outside of your webroot.

                you can buy me a beer, if you like MIGX


              • I have a PHP file (that I cant make a snippet out of). I need to connect it to the database and rather then doing it the normal way was wondering if I could just include a header file of some sort that already has a DB connection.
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                    Get my Book: MODX:The Official Guide
                    MODX info for everyone:
                    My MODX Extras
                    Bob's Guides is now hosted at A2 MODX Hosting