Question

Executing MSAccess Queries that uses vba code from ado.net

Asked by: RogerMoquin

Hi Experts,
I got  a complex scheduling program that was made with access then we made a vb.net interface that connect to the access.  in that access program the queries often use vba code to run in the query itself to return a calculated value on a row by row basis.
I'm not able to execute these particular query in ado.net it throw an exception that says:
undefined function 'calcxyz' in expression.
is there a way to run those queries?

see the code
the code works perfectly if I remove any reference to calcxyz
Please help

In Access
the Queries
Qry1:SELECT x,y,z, Calcxyz(x,y,z) as calcField from Tbl_fake; 
Qry2:insert into Tbl_Result(x,y,z,calcField) SELECT * from qry1; 
module
public function Calcxyz(x as long, y as long, z as long) as long
Calcxyz = x+y+z
end function 

in VB.NET 
Dim cmd As New OleDbCommand("Qry2", dbConnection)
cmd.CommandType = CommandType.StoredProcedure
cmd.ExecuteNonQuery()
                                  
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Asked On
2009-11-05 at 10:49:38ID24875545
Tags

Microsoft access visual studio 2005 vb.net

,

ado.net

Topics

.NET

,

Microsoft Access Database

,

Microsoft Programming

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: TorrwinPosted on 2009-11-05 at 10:53:10ID: 25752615

Looks like a pretty simple function, you could just replace it in your query:

Qry1:SELECT x,y,z, (x+y+z) as calcField from Tbl_fake;

 

by: RogerMoquinPosted on 2009-11-05 at 11:12:42ID: 25752814

this is an example so you experts don't spent your time understanding the function but spent your time finding the solution to this problem

 

by: TorrwinPosted on 2009-11-05 at 11:26:26ID: 25752961

"is there a way to run those queries?"

Yes, if you didn't like the answer, please explain why and we'll go from there.

Your CalcXYZ function isn't doing any sort of error checking, or manipulating the data in a way that SQL can't handle already, so it's pretty superfluous...so what is your reasoning for adding them outside of your query?

 

by: RogerMoquinPosted on 2009-11-05 at 11:48:32ID: 25753177

Ok
The function called calcxyz in the example does a lot of calculation i.e. opening a calendar table and verifing if its a valid date and returning a date taking into account a buffer and hrs needed to produce a product at a specific machine... obviously the queries are not really called qry1 and qry2 and the functions name is not calcxyz.

when i run the qry in access it returns the proper values...
the problem lies in ado.net it throw an exception when i call the query.

undefined function 'calcxyz' in expression

this example is an easy way to test the problem.

I have thousands lines of code in access doing exactly what should be done.
Right now in order to make these functionalities work I have to rewrite the code in .net which i find unproductive since I still need the database and the queries to run the program.

 

by: TorrwinPosted on 2009-11-05 at 12:07:32ID: 25753375

Ah, that is a completely different question.  Please understand that some users here are very inexperienced and that very simple questions (like I thought yours was) do come along often.

I do not believe it is possible to call a VBA function in a MS Access database from VB.NET in that manner.  What I would do is re-write the function in VB.NET and then perform your calculations there.  It may require a few more calls to the database though.  You could also upgrade the database to SQL Server and convert the function to a stored procedure (if you have that option).  

If it helps, I did a little research just to back up my theory and found the following:
http://www.experts-exchange.com/Programming/Languages/Visual_Basic/VB_DB/Q_10335068.html?sfQueryTermInfo=1+access+ado+call+function+vba

 

by: RogerMoquinPosted on 2009-11-05 at 12:35:23ID: 25753698

it seems that there's a way to do stored procedure in access...
But this solution does not suit my problem but maybe others might find it useful

http://www.devcity.net/Articles/18/1/.aspx


 

by: RogerMoquinPosted on 2009-11-05 at 12:37:03ID: 31650652

Conclusion it's not possible!

20120131-EE-VQP-002

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