Excel Formula To Determine If Number Is Between Two Numbers Working With Access VBA Recordsets Using DAO or ADO: Some More Key Points With VBA Recordsets

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Working With Access VBA Recordsets Using DAO or ADO: Some More Key Points With VBA Recordsets

As a follow-on from another article where I covered the first three key points of traps and tips to look for when calling the Access VBA DAO or ADO libraries Recordset object, here are four more key points to note.

As a recap, the first three points mentioned are included DAO against ADOTesting through methods that move the cursor recordsets and default OpenRecordset Method types.

Here are four more key points:

1. Seek and ye shall find

There are two method options for finding matching data values. You can use either search for or Find it (Find first, find last, find next, find previous) methods.

The search for The method is fast because it indexes against the key ‘sorted’ fields in the table and not against queries or SQL statements. Find it Methods that scan criteria for a recordset make it slower but easier to find answers in your data.

As a good practice when finding records is to first test for a match before iterating through known records using NoMatch property to avoid runtime errors. For example:


rs.FindFirst "Country = ""UK"""
If Not rs.NoMatch Then
'carry out some VBA execution here...
End If

2. Creating a new record, where is the cursor?

To add a new record you use Add new and Update Methods wrapped around field collections in a known recordset.

However, the cursor (ie where the insertion point is currently located) is not always where the new record instance resides when saving (updating) the record.

Therefore, to ensure that you want the code to continue to the newly added record, you must tell the system where to place the cursor. Bookmark and Last modified qualities. For example:


rs.AddNew 'Fields here are set to values...
rs.Update rs.Bookmark = rs.LastModified
'Continue working with the new record here...

3. Take out the trash! Close and clean up your code

One of my personal bug-bears with bad coders is the lack of cleaning up after your own mess! When creating any items, learn to properly dispose of them when you no longer need them.

Actually, VBA is very friendly in this regard and will take out the garbage for you but that’s not the point. You may need to reference an object reference elsewhere in your procedures and this can cause reference problems if the scope of the object variables is not correct or if you change it.

Two places to dispose of your object variables; within one code routine and also error handling routines within another. For example:


Sub WorkingWithRecords
On Error Goto Err_WWR
Dim db as Database
Dim rs As Recordset
Set db = CurrentDb()
Set rs = db.OpenRecordset("Customers")
'Some code here...
rs.Close 'Close the opened table.
db.Close
Exit_WWR:
Set rs = Nothing 'Set objects to nothing-ness.
Set db = Nothing
Exit Sub Err_WRR: 'Error handler here...
Resume Exit_WWR
End Sub

4. Compiling questions in VBA code?

In Access, you create a query using the Query Interface (known as QBE – Query by Example Grid) and Microsoft Access learns to compile this query the first time you run and save the query.

Access uses VBA code QueryDef Object which is a way of creating a query object in code and also compiles it means it is a bit faster to run and execute.

This is a better practice than creating SQL statements on the fly and then executing them but different methods of approach such as executing query objects against SQL statements have pros and cons which I am going to discuss here.

The object is set using the reference Create a QueryDef Method:


Dim qd As QueryDef
Set qd = CreateQueryDef(str_Name, ste_SQL)

There you have it, 4 more key points on DAO and ADO when coding VBA in Microsoft Access. It’s worth spending time looking at the properties, methods, and events in both libraries.

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