I need to set up a connection in the DB Navigator plugin for PHPStorm in a mac (snow leopard). It asks me for the route of a library that implements the java.sql.Driver class. I
First of all, you don't need to install third-party DB Navigator plug-in, as database functionality is available in PhpStorm out of the box, see Tools | Data Sources.
Add new data source, it will allow to choose the database and the driver, and will download the required database drivers automatically.