On Sep 12, 2010, at 3:34 PM, Robert Cummings wrote:
On 10-09-11 12:52 PM, Tamara Temple wrote:
I have a general question and am looking for best practices.
Suppose I present a user with a form for editing an entry in a table,
i.e., the form has filled in values from the existing table entry.
Now, suppose they click on 'submit' without making any changes in the
form. (Perhaps, say, rather than clicking 'Cancel' or 'Return to
Main'
or some other option which would get them out of that screen without
submitting the form).
Is it worth the overhead of passing along the previous values in the
table in hidden fields so that fields can be checked to see if
they've
been updated or not after the submit? Or is it worth reloading the
old
values from the table to check against the newly submitted form? Or
is
all that overhead not worth the time because an update that
overwrites
existing values with the same values is not that onerous?
(Is that question clear enough?)
I use database table to object mapping classes. The base class sets
a dirty bit if a field actually changes. If an attempt is made to
save the data and no dirty bits are set, then the save method
returns true for a successful save, but no commit to database is
made since nothing has changed. In this way I never think about the
problem beyond the original implementation of the base class.
Ok, but how do you detect if a field changes? The specific
implementation between application and data storage is probably moot
until you figure that part out.
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