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Tip of the Day
Language: COM/DCOM/COM+
Expertise: Beginner
Jul 27, 2000

Return a Recordset from a COM Component to ASP

Question:
Can I make a COM component in VB return a query result in the form of a recordset to the calling ASP Script?

Answer:
Yes, a COM component can return a recordset. Create your Public Function in the (VB) COM component as follows:

Public Function GetRecordSet(byval strSQL as variant) as ADODB.Recordset
As you can see, the function accepts a single argument—a valid SQL statement—and returns an ADODB Recordset. You can increase the number of arguments to include a connection string or a database name, etc.

Within your Function, remember to create, disconnect, and then return a recordset:

Dim objRS as ADODB.Recordset

   Set objRS = New ADODB.Recordset

   objRS.open ....valid arguments including connection string

   ' Disconnect the recordset
   objRS.ActiveConnection = Nothing

   ' -- Finally, return the recordset back
   Set GetRecordSet = objRS
Remember to use the SET statement when working with objects. If the above code was within your COM component called MyCom in a Class Module called MyClass then your ASP page code would look like this:
Dim objCOM, objRS
 ' -- Create a recordset object
 Set objRS = Server.CreateObject("ADODB.Recordset")
 ' -- Create our COM object
 Set objCOM = Server.CreateObject("MyCom.MyClass")
 ' -- Execute the Function to get the recordset
 Set objRS = objCOM.GetRecordSet("Select * from Customers")
 ' -- destroy the Com object
 Set objCOM = Nothing
 ' -- play with your recordset variable
Again, remember to use the SET statement when working with objects. In 95 percent of the cases on Web pages, you will be doing read-only fetch from the database. In that case, always remember to use disconnected recordsets.
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