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Discussion: DAO.DBEngine.Wo rkspaces() versus DAO.Workspaces( )

NeoPa
32,584 Recognized Expert Moderator MVP
My question, or point of discussion if you like, is why is the default Workspace object always described as DBEngine.Worksp aces(0) and not the simpler Workspaces(0) which, according to all I've discovered, is the same thing. Am I missing something important? I couldn't even find a reference that confirmed that the references are the same, although they are both from the DAO library.

I'm looking for a way to determine the actual Workspace object involved when dealing with a Database object. I'm surprised the DAO.Database object doesn't have a simple property pointing to the workspace it's within, but it doesn't. The best I have so far is :

Expand|Select|Wrap|Line Numbers
  1. 'WorkspaceFromDB() returns the Workspace object that contains dbSought.
  2. Public Function WorkspaceFromDB(ByVal dbSought As DAO.Database) As DAO.Workspace
  3.     Dim wsVar As DAO.Workspace
  4.     Dim dbVar As DAO.Database
  5.  
  6.     For Each wsVar In Workspaces
  7.         For Each dbVar In wsVar.Databases
  8.             If dbVar Is dbSought Then
  9.                 Set WorkspaceFromDB = wsVar
  10.                 Exit Function
  11.             End If
  12.         Next dbVar
  13.     Next wsVar
  14. End Function
Nov 18 '12 #1
23 7553
ADezii
8,834 Recognized Expert Expert
To the best of my knowledge, there is no easy way to determine the actual Workspace Object referenced by a specific Database. Your workaround looks like a good solution. Just out of curiosity, why do you need to determine the Workspace Object for a specified DB?
Nov 18 '12 #2
NeoPa
32,584 Recognized Expert Moderator MVP
ADezii:
Just out of curiosity, why do you need to determine the Workspace Object for a specified DB?
I'm writing routines that execute batches of SQL commands that should be run as a single transaction. Transactions, and the methods that go with them, are things that work at the Workspace level, so, while the SQL must be executed on the Database object, the Transaction is defined by the related Workspace object. As such, the Database and the related Workspace objects are both required.
Nov 19 '12 #3
zmbd
5,501 Recognized Expert Moderator Expert
http://msdn.microsoft.com/en-us/libr...ffice.12).aspx
First paragraph under the list:
When you first refer to or use a Workspace object, you automatically create the default workspace, DBEngine.Worksp aces(0).
It maybe the matter of being "more correct" in the description of the workspace.

I for one, whenever using this method, have always used the full construct much like I do with the DAO.* objects to ensure that there is no misunderstandin g the code parser - I simply do not trust the developers not to muck things up with some new or changed library reference. :)
Nov 19 '12 #4
NeoPa
32,584 Recognized Expert Moderator MVP
That was my best guess Z. The linked page seems also to work on that basis in that it seems to use them interchangably, yet it doesn't ever explain that explicitly (which is pretty poor for an official page - apparently switching between them randomly with no explanation). If anyone knows where that is confirmed I'd be interested to see.
Nov 19 '12 #5
ADezii
8,834 Recognized Expert Expert
I, like zmbd, have always fully qualified the Workspace Object with DBEngine to avoid any possible conflicts. Aside from brevity, I do not see any reason to not use the DBEngine.Worksp aces(?) Construct.
Nov 19 '12 #6
NeoPa
32,584 Recognized Expert Moderator MVP
I'm still looking for confirmation that they are equivalent. I've seen articles where the assumption seems apparent, but none that explain the situation or even refer explicitly to their being equivalent references to the same collection.

As far as I can see from my own checking, Workspaces() is a DAO collection just as DBEngine is a DAO object. My experimenting has shown them to be equivalent in the extremely limited test environment (with simply the * Default Workspace * existing) that I've used.
Nov 19 '12 #7
TheSmileyCoder
2,322 Recognized Expert Moderator Top Contributor
Do any of you ever use anything BUT the default workspace? And if so for what purpose, and why not use the default workspace?
Nov 21 '12 #8
ADezii
8,834 Recognized Expert Expert
Personally, I never had any reason to use anything but the Default Workspace.
Nov 21 '12 #9
NeoPa
32,584 Recognized Expert Moderator MVP
Smiley:
Do any of you ever use anything BUT the default workspace? And if so for what purpose, and why not use the default workspace?
No. Not yet.

If I were to though, it would be to ensure that updates I applied were not counted as part of a transaction.

It should be bourn in mind however, that the Default Workspace and CurrentDb() are not used by the Access interface when dealing with the open database. Running action queries manually (or even via the DoCmd.RunSQL etc commands) will ensure that the changes are outside the scope of any defined transactions in the Default Workspace. This can be a bit of a gotcha if you have procedures, as I do, to do specific tasks that use this approach. I had to recode how my record deletions were invoked for this very reason.
Nov 22 '12 #10

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