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The problem was the following: I had this
example code and the size() method just gave me insane result all the
time, while just changing the driver to QMYSQL made the code work
properly. After asking on #qt, I have been
pointed out that the SQLite backend of
QtSql does not support the size() method. :/
So - for now - I’ll just use MySql for my unit tests, even if that means I have to manually truncate the contents of each table. Worths checking a bit later again, though - since I already used in-memory SQLite for my unit tests when I had a project in PHP with Doctrine, and it was working just fine.