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We have a "MyModule" module, which has a mymodule.install. Inside the file, there is mymodule_update_8001, 8002 ... etc.

How can I tell programmatically that on which version the module has at the moment? I know where to find them in database (key_value table), but I would like to use a service instead, if that's possible.

The closest I found:

$update_hook_count = \Drupal::keyValue('system.schema')->get('mymodule');

This returns the update hook number.

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  • You answered yourself: You are actually using a service. If you mean you want to use an injected dependency, you cannot, from a function.
    – apaderno ♦
    Jul 27, 2016 at 11:13
  • Thank you! Am aware of that, I just pasted this way for the sake of simplicity. Should I separate the answer, so I could accept it.
    – ssibal
    Jul 27, 2016 at 11:35

4 Answers 4

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You can use the global function drupal_get_installed_schema_version():

$update_hook_count = drupal_get_installed_schema_version('mymodule');
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  • Thank you!! I prefer the service approach tho. It's good to know it's using the same service.
    – ssibal
    Jul 27, 2016 at 13:42
  • No problem, the function uses the same service. The only difference is that it stores the result in a static variable. If someone ask again about a schema version in the same request, it is then prepared to deliver a very fast answer.
    – 4uk4
    Jul 27, 2016 at 13:55
  • That's true, and cool stuff. Wondering when it could be a performance issue to ask for schema version so many times ^^
    – ssibal
    Jul 27, 2016 at 13:59
  • My guess is this would only happen if you run update.php.
    – 4uk4
    Jul 27, 2016 at 14:04
1 
drush sql-query "SELECT schema_version FROM system WHERE name = 'mymodule';"
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  • Probably this is the worst solution from clean and robust perspective, but it's simple.
    – ssibal
    Apr 9, 2019 at 6:09
  • Was useful for debugging.
    – Ivan Chaer
    Apr 9, 2019 at 9:28
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drush php-eval "echo drupal_get_installed_schema_version('my_module');"

From: https://www.drupal.org/docs/drupal-apis/update-api/updating-database-schema-andor-data-in-drupal-8#s-useful-drush-commands-while-developing-your-hook-update-n

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0

The Ivan Chaer's answer is deprecated due to database changes. Update below:

drush sql-query "SELECT CONVERT(value USING utf8) FROM key_value WHERE name = 'mymodule'"
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