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Tim Gornall wrote:
I just realized I don't know how to separate the
presentation and business logic.
To separate presentation and business logic in 5250 applications, try to
visualize the display file in one module and the database files in
another. If both modules need access to the same data structures, then
either export/import the data structures, or pass them as procedure
parameters. If the application is inquiry only (or even mostly),
there's probably not enough "business logic" to warrant separate
modules.
It get's more complicated, and the solutions vary, when working with
"thick" or "rich" clients, where there's a tendency to move more and
more workload to the client.
It gets even more complicated and the solutions become REALLY varied
when you add middleware such as Net.Data, PHP, MS .Net, and J2EE, and
their respective language environments.
And it gets REALLY REALLY varied if you chose SQL and object relational
mapping for database I/O.
Nathan.
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