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Franco Jommi
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 Posted: Sun Jan 25, 2004 3:08 pm Post subject: Implicit POST ? |
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I have a BeforePost routine that performs a few cheks before accepting the
data typed by the user in a DBGrid appended row. If the checks are passed,
my routine ends with a specific POST statement to consolidate the data (just
before the post, the BeforePost event is deactivated to avoid an infinite
loop, and then reactivated).
I have a <Write> button to end the changes the user wants to make, but I
used a BeforePost event to cater for the situation where the user fills the
data and then moves the cursor to another row, ignoring the button.
I knew that moving the cursor of a table form one row to another (say in a
DBGrid) while in edit mode is just like making a POST, but I found that in
this case, my routine writes twice the same record.
Did you know this ?
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pr
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| Posted: Mon Jan 26, 2004 3:44 am Post subject: Re: Implicit POST ? |
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"Franco Jommi" <franco.jommmi (AT) tin (DOT) it> wrote
| Quote: | I have a BeforePost routine that performs a few cheks before accepting the
data typed by the user in a DBGrid appended row. If the checks are passed,
my routine ends with a specific POST statement to consolidate the data
(just
before the post, the BeforePost event is deactivated to avoid an infinite
loop, and then reactivated).
I have a <Write> button to end the changes the user wants to make, but I
used a BeforePost event to cater for the situation where the user fills
the
data and then moves the cursor to another row, ignoring the button.
I knew that moving the cursor of a table form one row to another (say in a
DBGrid) while in edit mode is just like making a POST, but I found that in
this case, my routine writes twice the same record.
Did you know this ?
|
Why so complicated? Check the values as you do now.
If one is not acceptable then execute the the silent
exception SysUtils.Abort in the BeforePost event.
PR
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Jeremy Collins
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| Posted: Mon Jan 26, 2004 8:43 am Post subject: Re: Implicit POST ? |
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Franco Jommi wrote:
| Quote: | I have a BeforePost routine that performs a few cheks before accepting the
data typed by the user in a DBGrid appended row. If the checks are passed,
my routine ends with a specific POST statement to consolidate the data (just
before the post, the BeforePost event is deactivated to avoid an infinite
loop, and then reactivated).
I have a <Write> button to end the changes the user wants to make, but I
used a BeforePost event to cater for the situation where the user fills the
data and then moves the cursor to another row, ignoring the button.
I knew that moving the cursor of a table form one row to another (say in a
DBGrid) while in edit mode is just like making a POST, but I found that in
this case, my routine writes twice the same record.
Did you know this ?
|
Yes - it is documented. You don't need to call Post at all, the idea is that
BeforePost allows you to *cancel* a post, normally by raising an exception.
Commonly, people call Sysutils.Abort - the silent exception.
--
jc
Remove the -not from email
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Franco Jommi
Guest
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| Posted: Mon Jan 26, 2004 8:57 am Post subject: Re: Implicit POST ? |
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This is interesting and might be the solution to my problem. But what is it
a "silent exception" ? Can you give an example on how to call this exception
? Thanks
"Jeremy Collins" <jd.collins (AT) ntlworld-not (DOT) com> ha scritto nel messaggio
news:Aq4Rb.10990$JL4.90049 (AT) newsfep4-glfd (DOT) server.ntli.net...
| Quote: | Franco Jommi wrote:
I have a BeforePost routine that performs a few cheks before accepting
the
data typed by the user in a DBGrid appended row. If the checks are
passed,
my routine ends with a specific POST statement to consolidate the data
(just
before the post, the BeforePost event is deactivated to avoid an
infinite
loop, and then reactivated).
I have a <Write> button to end the changes the user wants to make, but I
used a BeforePost event to cater for the situation where the user fills
the
data and then moves the cursor to another row, ignoring the button.
I knew that moving the cursor of a table form one row to another (say in
a
DBGrid) while in edit mode is just like making a POST, but I found that
in
this case, my routine writes twice the same record.
Did you know this ?
Yes - it is documented. You don't need to call Post at all, the idea is
that
BeforePost allows you to *cancel* a post, normally by raising an
exception.
Commonly, people call Sysutils.Abort - the silent exception.
--
jc
Remove the -not from email
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Jeremy Collins
Guest
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| Posted: Mon Jan 26, 2004 9:44 am Post subject: Re: Implicit POST ? |
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Franco Jommi wrote:
| Quote: | This is interesting and might be the solution to my problem. But what is it
a "silent exception" ? Can you give an example on how to call this exception
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As I said, it is documented. Here is an exmaple of raising a
silent exception:
begin
Abort;
end;
HTH
--
jc
Remove the -not from email
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