Support » Plugins » How to code plugin to cleanup after itself if uninstalled?

  • Resolved garbonzo


    Can you tell me, or point me to, how to code a plugin to clean up after itself if uninstalled?

    I’m writing a little plugin for myself that adds and uses an extra table in the database, but I will not be needing the functionality at a later date. At that point I will uninstall the plugin but I don’t want to have to go into the database to remove the extra table.


Viewing 8 replies - 1 through 8 (of 8 total)
  • Michael Torbert


    WordPress Virtuoso


    But how do I tell the plugin to ‘sense’ that it’s being uninstalled, and to therefore drop the table?


    Michael Torbert


    WordPress Virtuoso

    You can try the “deactivate_” hook, but that may not work since it’s the plugin being deactivated. The easiest way is to just have a button to drop the table.
    Have you even looked at the API?

    Just wondering about the same question for any options that are entered into the options table?

    Michael Torbert


    WordPress Virtuoso

    DELETE FROM x-options WHERE y=z

    These are basic SQL queries. If you don’t know things like this, I would recommend not attempting to write code to mess with the database on a live site.

    Moderator Samuel Wood (Otto)

    (@otto42) Admin

    If you use add_option or update_option, then I would suggest looking closely at delete_option.

    To sense deactivation of the plugin, I suggest something like this:

    function myplugin_deactivation_check(){
    // oh no, I'm being deactivated! Clean up time!
    register_deactivation_hook(__FILE__, 'myplugin_deactivation_check');

    Thanks for the helpful replies, Otto42 and hallsofmontezuma. 🙂

    p/s: @halls: You’ll be glad to know that I’m not writing any plugins at all. I’ve just been reading about the advice from WLTC that plugin authors should make sure that de-activation of the plugin removes any extra bits that have been added to prevent bloating? I’m afraid I can’t remember the actual word.

    One day when I do learn to write plugins, this will be very good advice to follow!

    Neato, thanks everybody.

Viewing 8 replies - 1 through 8 (of 8 total)
  • The topic ‘How to code plugin to cleanup after itself if uninstalled?’ is closed to new replies.