TOPIC:

While trying to open a connection to an mysql-server. I got an error 'libmysql.dll, libmysql55.dll ... not found".
The libmysql.dll was reachable.
The problem was with the ZConnection-Component.
The default-Port is 0.
Change this to the port of the mysql-server (Standard-Port is 3306).
Then it works.

I doubt this is a problem. 3306 is the default, but nothing can stop you from running mysql on a different port. So how should ZConnection know about that?
But what IS a problem it's the wrong exception message. Would you care to try add this situation to the exception handler and post it here?
(I'm not in the developers team.)

Because in previous versions, ZConnection took always the standardport dependig on the selected protocol, e.g. 3306 for mysql, 5432 for postgresql etc.
The standard behaviour of zeos changed and the error message (libmysql.dll not found) misleads.
So It was just a hint, not a real problem ..