Abort long-running fetch
Posted: Thu 29 Nov 2007 08:25
There is a TOraQuery.BreakExec procedure that allows me to abort query execution while it is running on the server. Sometimes, I rather wish to cancel fetching. Lets consider a query that executes fast and displays in an instant the first rows in a data grid. Now the user presses the "Last" button, and the application starts fetching a whole bunch of rows. After waiting a couple of minutes, he would wish to cancel fetching rather then killing the entire application. Is there a way, maybe some sample code, how this can be done?
I would like to display a modal dialog in another thread with a cancel button as soon as fetching runs longer than say 3 seconds. It is essential that it works event-driven, i.e. if the user presses "Last" it should come up. The button should allow to cancel fetching. As soon as the fetching has completed the dialog should hide automatically. I have done a similar thing for executing.
Any suggestions are welcome. Maybe it is a good idea for a future ODAC enhancement.
Regards,
Holger
I would like to display a modal dialog in another thread with a cancel button as soon as fetching runs longer than say 3 seconds. It is essential that it works event-driven, i.e. if the user presses "Last" it should come up. The button should allow to cancel fetching. As soon as the fetching has completed the dialog should hide automatically. I have done a similar thing for executing.
Any suggestions are welcome. Maybe it is a good idea for a future ODAC enhancement.
Regards,
Holger