have probably heard quite a bit about
Java applets. We discussed in Chapter 8, however,
how doing database access in the client is a really bad idea. We have
packaged with the examples in this book a servlet that uses the JDBC
knowledge we have discussed in this chapter to store the comments
from visitors to a web site in a database and display the comments in
the database. While servlets are not in themselves part of the
three-tier solution we discussed in Chapter 8,
this example should provide a useful example of how JDBC can be used.
For this example, all you need to know about servlets is that the
POST events, and
GET events. The rest of the code is either
simple Java code or an illustration of the database concepts from
this chapter. You can see the servlet in action at http://www.imaginary.com/~george/personal/guestbook.shtml.