On Dec 23, 2007, at 7:51 PM, Adrian Klaver wrote:
>> Yes. When you changed the table in the backend, the data in the
>> bizobj is now out-of-date. You would have to call requery() to get
>> the latest values in the database.
>
> Then maybe you can clear up something for me. In the api docs the
> dForm.update
> method has the following description:
>
> update(self, interval=None)
>
> Updates the contained controls with current values from the source.
>
> <snip>
>
> I assumed the source was the table to which the bizobj refers.
> Therefore I
> thought when I did self.update() it would go back to the table for the
> values. Am I to understand that the source is the cursor/DataSet
> and that in
> order to get fresh values in a form control I have to call requery
> () in order
> to refresh the data in the cursor/DataSet and hence the form?
The source is the bizobj; i.e., the 'DataSource'. The update()
method is called frequently; it would not be wise to have it
constantly requerying the database.
There's another good reason not to behave that way: let's say you
run a query and get back 10 records. You change the name in the first
record from 'Smith' to 'Jones'; now the bizobj has 'Jones' for the
name, but the database has 'Smith', since you haven't saved your
changes yet. Then you call next() to move to the next record; update
() is called to refresh the controls with Record #2's values, so now
the name field shows 'Baker', which is the name of record 2. After a
while you call prior() to go back to the first record (the one that
you modified); update() is again called to change the controls to
display the values for Record #1. But what should be displayed in the
name field? The original value in the database, or the modified value
in the bizobj?
I think that if anything but the modified value in the bizobj were
to show, there would be a lot of angry users whose changes were being
erased by Dabo.
-- Ed Leafe
-- http://leafe.com
-- http://dabodev.com
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