What is the alternative for hook_node_submit() in Drupal8?

Question

CMS

Now I use Drupal 8.
It is necessary to write the data in the MSSiquel database when sending the completed form.
Question: How to catch pressing this button so that the data is written to the database?
thanks for the help

Answer 1

https://www.drupal.org/node/2420295

function mymodule_form_node_form_alter(&$form, FormStateInterface $form_state) {
  $form['actions']['submit']['#submit'][] = 'mymodule_node_form_submit';
}

function mymodule_node_form_submit($form, FormStateInterface $form_state) {
  
}