May 2007
Intermediate to advanced
1152 pages
30h 53m
English
book
Access™ 2007 VBA Programmer's Reference
by Teresa Hennig, Rob Cooper, Geoffrey Griffith, Armen Stein
Content preview from Access™ 2007 VBA Programmer's Reference
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7.9. Testing the State Property
If you choose not to rely on events, you can always test the object's State property. It returns a value that indicates the status of the operation currently being carried out. For example, the following code segment tests the current state of a Connection object's Open operation.
cn.Open CurrentProject.Connection, , , adAsyncConnect
Do Until cn.State = adStateOpen
DoEvents
Loop
rs.Open "Invoices", cn
Not what you'd call a professional approach, but every programmer is different, and you might like to do such things. Of course, the previous code could get into an endless loop if the connection is never opened, so it is usually a good idea to limit the number of loops to a finite number when using an asynchronous connection. The State property can return the following values.
| Constant | Value | Description |
|---|---|---|
| adStateClosed | 0 | The object is closed. |
| adStateOpen | 1 | The object is open. |
| adStateConnecting | 2 | The object is connecting. |
| adStateExecuting | 4 | The object is executing a command. |
| adStateFetching | 8 | The object is retrieving rows. |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.