PEAR::MDB2 migration

Finally finished the migration to PEAR::MDB2. This took about two days of work for Geneone and a bit extra for (issues with sequences).

Also determined some slow queries and added indexes. neonDragon keeps going on about a couple of queries now being 1,000,000% faster because of indexes.

I said functions such as autoExecute and query with arguments as the second string didn't exist in MDB2. I was wrong: they do exist and are part of the extended class although I didn't know that due to the poor documentation. 

3 thoughts on “PEAR::MDB2 migration

  1. Hi,

     I’ve also been searching for what sems like ages to find a way round rewriting all my queries that use placeholders .. I don’t suppose you could give me a quick example of how you managed to get this working in MDB2 could you ??


  2. Hi there,

    You just have to make sure you use prepare/execute.

    $res = $db->query ("select * from blah where test=?", array(1));


    $q = $db->prepare("select * from blah where test=?");
    $res = $q->execute(array(1));

    It’s not particularly quick but it’s a one off job and if you use the search functionality to find all files with queries you should be able to change them all pretty quickly.

    It’s worth noting that ! also can’t be used as placeholder anymore. 

  3. BTW, you can also use named parameters in MDB2:

    $data = $db->getAll("select * from blah where test=:id", null, array(‘id’ => 1));

    And also if you dislike the idea of changing all your query()s to prepare/execute()s, you can do it only once, in a custom module:

    class MDB2_Mything extends MDB2_Module_Common {

      function myQuery($sql, $data) {
        $db =& $this->getDBInstance();
        $q = $db->prepare($sql);
        $res = $q->execute($data);
        $return $res;

    Put this in Mything.php in an MDB2 dir inside the include path, then in your scripts do:

    $res = $db->myQuery("select * from blah where test=?", array(1)); // php5
    $res = $db->mything->myQuery("select * from blah where test=?", array(1)); // php4


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