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Data validation
with WebObjects 5
By: mmalcolm crawford, Adapted
By Owen McKerrow
June 11, 2001 - 03:10 AM
http://www.stepwise.com/Articles/Technical/2001-06-13.01.html or
get it here (saved as an IE Web
Archive File )
Every discussion that comes up on the various WebObjects mailing list about Data Validation, all result in people being refered to a artcile written by Malcolm Crawford. So this weeks lecture looks at this actile and the example app he provides with it.
A desirable feature in any data entry application, whether GUI- or Web-based,
is the ability to check data values before they are entered into a database.
Ideally the user interface should guide the user into entering the right
sort of data with the right format, however user-error is an unfortunate
fact of life.
"Validation" may be implemented at a number of levels below
the UI, from simple checking of data type, through checking that values
lie within a sensible range, to integrity constraints implemented by the
database itself.
WebObjects and the Enterprise Objects Framework (EOF) provide mechanisms
for data validation at all these levels; in this article we will concentrate
on validation down to the level of inter-attribute constraints in an enterprise
object.
Lect 6 : Malcolms Demo ( Download )
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Page updated September 20, 2004
