As part of the Solar-1.0.0alpha2 release, we included an SQL adapter that lets you connect to master/slave MySQL installations. Read on for how to set it up using just the config file.
Solar_Registry is a class for storing singleton objects which are used usually for things like SQL objects and the response and request objects. Now what's interesting, is that in the new version of Solar a new configuration key registry_set was added for the Solar arch-class. You can use it to tell Solar to automatically add objects to the registry when it starts up.