The JDBC Classes for Creating a Connection
==========================================

JDBC uses on class (java.sql.DriverManager) and two interfaces 
(java.sql.Driver and java.sql.Connection) for connecting to a database. The 
following note provides a brief introduction to these three java 
interface/classes:


java.sql.Driver
---------------

    Unless you are writing your own custom JDBC implementation, you should 
    never have to deal with this class from you application. It simply gives
    JDBC a launching point for database connectivity by responding to
    DriverManager connection requests and providing information about the
    implementation in question.


java.sql.DriverManager
----------------------

    Unlike most other parts of JDBC, DriverManager is a class instead of an
    interface. Its main responsibility is to maintain a list of Driver
    implementations and present an application with one that matches a
    requested URL. The DriverManager provides registerDriver() and
    deregisterDriver() methods, which allow a Driver implementation to
    register itself with the DriverManager or remove itself from the list. You
    can get an enumeration of registered drivers through the getDrivers()
    method.


java.sql.Connection
-------------------

    The Connection class represents a single logical database connection. In
    other words, you use the Connection class for sending a series of SQL
    statements to the database and managing the commiting or aborting (rollback)
    of those statements.