In The Netherlands you can carry locking knife, with up to a 9cm longs blade. But if the officer suspect your carring it as weapn, you can be arrested. Like carring a knife in a bar in the middle of a city.

Also to prevent issues about wheather a knife is a weapon or not, they added a article in the local law (APV) to some risk zones. A total ban of knife are applied there on the streets.

If you use common sence, you wouldn't have a problem here.