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As far as Django is concerned, the process of separating out the database server is extremely easy: you ll simply need to change the DATABASE_HOST setting to the IP or DNS name of your database server. It s probably a good idea to use the IP if at all possible, as relying on DNS for the connection between your Web server and database server isn t recommended. With a separate database server, our architecture now looks like Figure 20-2.

Here s a road map of the code that we ll need to tackle in building a GUI for the SRS. We re going to add a GUI presentation layer onto our SRS model layer in such a way as to leave the model classes undisturbed from the way that they were originally designed in 14. In so doing, the model classes will continue to serve as pure abstractions of real-world objects. This design principle is known as achieving model-view separation, aka model-presentation layer separation. (We did this same sort of thing when we added a data access/persistence layer to the model in 15, thus upholding the design principle of model data layer separation.) Thus, all of the following model layer source code as presented in 14 and as reused unchanged in 15 is reusable as-is once again with the GUI version of the SRS:

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Note The examples in the remainder of this chapter show only the contents of the SQL*Plus scripts. It is up to you to decide which method you want to use to create and maintain those scripts.

Course.java EnrollmentStatus.java Person.java Professor.java ScheduleOfClasses.java Section.java Student.java Transcript.java TranscriptEntry.java and thus we won t need to revisit any of these classes in this chapter. By insulating our model classes from the application s user interface, we make it easy to Modernize the technology with which we present the view, should we wish to do so at a later date (we ll illustrate this conceptually with J2EE toward the end of the chapter). Add multiple views to the same model, to perhaps accommodate multiple different categories of user. Reuse the same model with different applications entirely! Furthermore, all of the classes that comprised the data access layer of our application as introduced in 15 are also reusable as-is from that chapter: CourseCatalog.java Faculty.java InvalidStudentException.java SRSDataAccess.java SRSInitializationException.java StudentPersistenceException.java and so we won t need to revisit any of these classes in this chapter, either. All we re going to need to do to add a GUI to the SRS is to Extend two Swing window (Container) classes: MainFrame, a direct subclass of JFrame, to serve as our main application window PasswordPopup, a direct subclass of JDialog, which will be used when logging a student on to the SRS Modify our SRS driver class to take advantage of this newly added GUI/presentation layer.

Figure 20-2. Moving the database onto a dedicated server Here we re starting to move into what s usually called n-tier architecture. Don t be scared by the buzzword it just refers to the fact that different tiers of the Web stack get separated out onto different physical machines. At this point, if you anticipate ever needing to grow beyond a single database server, it s probably a good idea to start thinking about connection pooling and/or database replication. Unfortunately, there s not nearly enough space to do those topics justice in this book, so you ll need to consult your database s documentation and/or community for more information.

If you haven t already done so, please download and print a copy of the source code for 17 so that you have it handy to refer to when following along with the discussion that follows. Download instructions are provided in Appendix D.

One special SQL*Plus script must be mentioned here: login.sql. SQL*Plus automatically executes this script when you start a SQL*Plus session, as long as the login.sql script is located in the folder (or directory) from where you start SQL*Plus, or if that script can be found via the SQLPATH environment variable (under Linux) or Registry setting (under Microsoft Windows). Note that there is also a global SQL*Plus glogin.sql script. This script is executed for every user, and it allows you to have a mixture of global settings and personal settings in a multiuser environment. In a

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