How Do You Put A Object Behind Another On Code.Org 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 pitfalls and tips to look out for when using the Access VBA DAO or ADO libraries that call the Recordset object, here four other important points to note.

As a recap, the first three points mentioned include DAO against ADOtry the cursor to move way through Records and the default OpenRecordset type of procedure.

Here are four more important points:

1. Seek and ye shall find

There are two way options to find similar data values. You can use either of the Search or Search (FindFirst, FindLast, FindNext, FindPrevious) methods.

the Search The method is faster as it indexes against the key ‘indexed’ fields of a table and not queries or SQL statements compared to Search methods that scan criteria for a recordset making it slower yet more relaxed to find answers in your data.

As a good practice when searching for records is to try a match first before matching known records by using No Matches 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. Create a new record, where is the cursor?

To add a new record you use the AddNew and Update methods wrapped to collect the field into a known recordset.

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

Therefore, to ensure that if you want to continue coding the newly added record, you must tell the system where to place the cursor to continue editing with Bookmark and LastModified property. 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 making any items, learn to dispose of them properly when you no longer need them.

Actually, VBA is pretty friendly about this and will take out the garbage for you but that’s not the point. You may need to refer to the object reference elsewhere in your methods and if the scope of the object variable is incorrect or you change it it can cause reference issues.

Two places to throw your variable objects; one inside the code routine and the other inside the error handling functions as well. 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. Compile 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 when running and saving the query.

Access to VBA code uses the QueryDef thing that is the way to create a question object in the code and also compile it also means that it is slightly faster to run and execute.

This is a better practice than creating SQL statements on the fly and then executing them but as with different approaches there are pros and cons when executing query objects versus SQL statements which I won’t discuss. here.

The object reference is set using the CreateQueryDef procedure:


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

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

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