This class provides information about the database as a whole.
Many of the methods here return lists of information in ResultSets.
You can use the normal ResultSet methods such as getString and getInt
to retrieve the data from these ResultSets.
The Java SQL framework allows for multiple database drivers.
Each driver should supply a class that implements
the Driver interface.
The DriverManager will try to load as many drivers as it can
find and then for any given connection request, it will ask each
driver in turn to try to connect to the target URL.
It is strongly recommended that each Driver class should be
small and standalone so that the Driver class can be loaded and
queried without bringing in vast quantities of supporting code.
When a Driver class is loaded, it should create an instance of
itself and register it with the DriverManager.