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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Jul 9, 1999



Application Security Testing: An Integral Part of DevOps

Make Sure all Access QueryDef Objects are Closed

When you're working with QueryDef (SQL instructions stored on an MDB database) and open it, DAO loads all the QueryDefs. For example, if you have an MDB with five QueryDefs named qryCustomers, qryOrders, qryContacts, qrySales, and qryPersons, and you want to use the qryCustomers, do this:

Dim qdCustomer as QueryDef
Dim rsCustomer as RecordSet

	Set qdCustomer= Db.QueryDefs("qryCustomers")
	qdCustomer.Parameters![Custom ID]= 195
	Set rsCustomer= qdCustomer.OpenRecordSet(dbReadOnly)
		While not rsCustomer.Eof
			txtCustomerName= rsCustomer!Name

		rsCustomer.Close 'Close it
		set rsCustomer=Nothing
		'Free the reference to rsCustomer

		qdCustomer.Close 'Close it
		set qdCustomer =  Nothing
		'Free the reference to qdCustomer

The problem is that DAO only closes the qdCustomer, but the other four QueryDefs (qryOrders, qryContacts, qrySales, and qryPersons) remain open. To solve the problem, use this subroutine:

Public Sub ToNothing()
Dim qdGeneric as QueryDef

	'Surf the QueryDefs Collection
	For each qdGeneric in Db.QueryDefs
		qdGeneric.close 'Close it
		Set qdGeneric = Nothing 

End Sub

	Now put the call to the subroutine ToNothing:
Set rsCustomer = Nothing
Gonzalo Medina
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