我认为这可能对您有用,但我在这里猜测您的Usercat类:
select c from Usercat as uc inner join uc.cat as c where uc.isFavourtie = true and uc.user = :user

我认为这可能对您有用,但我在这里猜测您的Usercat类:
select c from Usercat as uc inner join uc.cat as c where uc.isFavourtie = true and uc.user = :user