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    <p>In your source code you are only applying the gen_mod behaviour, if you do wish to have a gen_server you can do it in the same module, if you define the gen_server behaviour has well.</p> <p>A good example would be the ejabberd module <a href="http://svn.process-one.net/ejabberd-modules/mod_archive/trunk/src/mod_archive.erl" rel="nofollow">mod_archive</a>, which implements both behaviours.</p> <hr> <p>Edit: I never really worked "directly" with mysql on erlang. But through the ejabberd methods I find it pretty "easy"(you will have to make a few setup, but rather easy). You have the method </p> <pre><code>ejabberd_odbc:sql_query_t(Query) </code></pre> <p>And has an example you can find it on the module <a href="http://svn.process-one.net/ejabberd-modules/mod_archive/trunk/src/mod_archive_odbc.erl" rel="nofollow">mod_archive_odbc</a>.</p> <p>To use that method(and the last module) I haved downloaded the mysql native driver and put the beams created from the driver in ejabberd ebin dir (you can put it anywhere has long is on the erlang path). A a soft link to the ejabberd ebin is my favorite:</p> <pre><code>ln -s &lt;diryouhavethedriver&gt;/ebin/*.beam /usr/lib/ejabberd/ebin/ </code></pre> <p>and do a few configurations on you ejabberd.cfg. This process is described on <a href="https://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver" rel="nofollow">this page on process one</a>. Notice that the full steps are to make mysql the full database of ejabberd. You may not want that, so you must jump a few steps. Hope this help.</p>
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    1. POEjabberd module with child process
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    1. USNuno Freitas
    1. USNuno Freitas
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    1. COThanks for your answer. With gen_server I'd start the db connection? How could I obtain then the db reference?
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      1. USMichael Weibel
    2. COEdit the Answer to include a bit about mysql, hope it help
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      1. USNuno Freitas
    3. COThanks Nuno. Regarding erlang_odbc: The problem here is, that I'm using Debian on the server side with the ejabberd deb of apt. And as far as I know, the deb isn't compiled with odbc support in it. Do you know if I compile the MySQL module on my own, can I still use the erlang_odbc module? I never tried that but I don't think it works :(
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