Sever vs Code database, Server Options

I'm looking for a well advanced introduction
Non-Oracle or Oracle texts/tutorials on

1. decide how to divide the code
-code strored data base
- and the application code (Apex).
Advantages, disadvantages etc.
In particular, a description of the stored database code execution.

2. installation of the Apex methods.
What are the options for servers
and what are the criteria of choice.

Thank you very much
Marios

Marcos,

Hmmm... You ask great questions.

How many levels can have an APEX application?

Well, it all depends on how you define levels and whether or not you're talking about physically or logically.

Physically, APEX has three basic levels; Browser, Application Server and database, where the 'Application Server' can be a number of alternatives (Apache/Oracle HTTP server and mod_plsql or gateway PL/SQL to embeded in Oracle 11 g or Oracle XE). The reality of our physical application server level, is that it really just sends requests from a browser into the engine of the APEX. So go to application servers, it is really, really light.

Logically the things are a little different.

Logically, it would be wise to say that the engine of the APEX is the "Application Server", even if he lives inside the database since its really the engine that runs our application logic.

Say that the browser is a floor (view/client) and the database is another level (data model). These levels is quite simple.

Then comes the "application logic" or the level controller. If we logically separate our data storage in the database (and that's a pretty good idea to physically do too with different schemas and/or commissions) of the logic of the application we can realize easily a same good architecture model/view/controller the controller and model levels is both physically in the database.

So if a data entry form rendering is handled by the browser and the database contains the table that stores the data that agrees to the shape, where should we put us business rules that will manipulate the data?

As suggested by Tyler it's almost always a good idea to put inside the database business rules. Let's say that some of the fields on the form are mandatory. APEX can do quite easily, required data entry fields but if it was not being applied inside the database (with a column NOT NULL for example) then another application (or same SQL/Plus for example) might be able to put the rows in the table with NULL values and break our business rule. There are many applications out there today that everyone was quite positive that no other application would never be built against which are completely planted and/or have incorrect data because someone got around the application logic by building a bad application.

But also remember that as a development environment there is no reason why you couldn't yell at or consume web services, XML, etc. of the APEX stream. How it is to you, but really, the sky is the limit.

Is it some sort of clearly separated "application-level"?

There may be if you want there to be. Certainly, you can use a workspace APEX of keeping your information "application level". Yet once as Tyler mentioned it's not a bad idea to put as much of this application-level logic in libraries of reusable code potentially using PL/SQL packages.

Is the database stored PL/SQL code part of this "application-level"?

It certainly can be. Sometimes it can be a little confusing, but there are really two "sections" of the PL/SQL with APEX code. The first is the real engine of the APEX itself. The second is any PL/SQL code using wizards, and/or code PL/SQL you write directly. You really should keep the two separate. By default this is what APEX with workspaces.

I hope this helps. If not, ask to...

Rich

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