i want show all databases names in my project?

[Lykurg]

Which database do you use? Some don't have the possibility to get the affected rows... Just try to print the names out and see if they appear:

while (get_query.next())
  qWarning() <<  get_query.value(0).toString();

while (get_query.next())
  qWarning() <<  get_query.value(0).toString();

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