🚀 go-pugleaf

RetroBBS NetNews Server

Inspired by RockSolid Light RIP Retro Guy

Thread View: borland.public.cppbuilder.database.multi-tier
2 messages
2 total messages Started by Walter Sciotti Mon, 06 Dec 1999 00:00
TProvider - TClientDataSet database update problem
#1358
Author: Walter Sciotti
Date: Mon, 06 Dec 1999 00:00
17 lines
1328 bytes
I have a TQuery on my server with an associated TUpdateSQL object to handle
updates to existing records. This exported via a TProvider. A TClientDataSet
on the client connects to it.

The problem is this: I can read the data and display it, no problem. But
when I make a change to the data and call ApplyUpdates(-1) on the
TClientDataSet I get an exception: "Record changed by another user." But it
hasn't been changed and the record remains unchanged in the database.

Other times no exception is thrown, but the data is still unchanged. And,
rarely, the data actually gets updated without any exception being thrown.

There is nothing wrong with the SQL statements involved. Other TQuery's,
etc., on the same interface on the same server work fine: they fetch and
update data just like they're supposed to.

Any ideas?
Re: TProvider - TClientDataSet database update problem
#1375
Author: John Graham
Date: Thu, 16 Dec 1999 00:00
34 lines
2190 bytes
Walter,
I ran into this problem recently.  The table I was trying to update, which is
also updated by other applications,  had a TimeDate field containing
milliseconds.  I used a TDbEdit control to enter a new date.  When I attempted
to update the table field I got the same error you're getting.  Our solution was
to remove the milliseconds from all rows in that table and modify the routine(s)
that wrote to that field.

This may not exactly match your problem, but you should see what fields are
giving you difficulty in the error dialog.  Check the actual contents of the
field(s) in the table to see what's there, then check what your code is actually
supplying to the field(s).

Regards,
John
Walter Sciotti wrote:

> I have a TQuery on my server with an associated TUpdateSQL object to handle
> updates to existing records. This exported via a TProvider. A TClientDataSet
> on the client connects to it.
>
> The problem is this: I can read the data and display it, no problem. But
> when I make a change to the data and call ApplyUpdates(-1) on the
> TClientDataSet I get an exception: "Record changed by another user." But it
> hasn't been changed and the record remains unchanged in the database.
>
> Other times no exception is thrown, but the data is still unchanged. And,
> rarely, the data actually gets updated without any exception being thrown.
>
> There is nothing wrong with the SQL statements involved. Other TQuery's,
> etc., on the same interface on the same server work fine: they fetch and
> update data just like they're supposed to.
>
> Any ideas?
Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads