I haven't worked so much with Tomcat , but firstly, you should download
the JDBC driver ,there are different jdbc drivers availbale on the
internet JNet or microsoft jdbc driver .Secondly, set the CLASSPATH for
3 JDBC jar files and finally enjoy using the database  . I don't know
that tomcat offer connection  pools if so thhen you can make a
connectoin pool for it and get it by calling JNDI . or doing the
traditional work of making connection and statement and executing a
query.