bof and eof

[jax]

Hi guys!

How exactly does rst.bof or rst.eof works when dealing with recordsets?
Does it refer to the first/last record in a recordset or what?

how do i find out the position of the current record in a recordset?

Help!

[xmin]

.bof and .eof are two properties of a recordset referring to, respectively, the beginning and end of the recordset, which is the memory mapping of a hard table or TableDef. They are not the first or last record, but, respectively again, the previous position to the first record and next positions to the last record. These two properties are very useful as is shown in the following code:

Code:
---------------------------------
With rst
.MoveFirst
Do
.MoveNext
Loop Until .Eof
End With
---------------------------------

The above code guides the pointer of the recordset to scroll through all the records in the rst while, with the clause Until .Eof, it stops coming across the End of File. Without this clause the loop works on and produces an error.

When an empty recordset is opened or created, both the .bof and .eof are true.

With a recordset the current record is often unknown, especially when you have just used the .Update method. To get or retrieve the current record, you can use the .BookMark property of a recordset, e.g.:

Code:
------------------------------
With rst
.MoveLast
strBookMark = .BookMark
.AddNew
.
.
.
.UpDate
.BookMark = strBookMark ¡®Retrieving the current record, i.e. the original "Last" record.
End With
-----------------------------

If you want to keep the absolute position of each record, you can use an array as bookmarks, e.g.:

Code:
-----------------------------
Dim strBookMark() As String 'Or Variant
Dim i As Long

With rst
ReDim strBookMark(.RecordCount-1)
.MoveFirst
While Not .Eof
strBookMark(i) = .BookMark
i = i + 1
.MoveNext
Wend
End With
-----------------------------

Those are some of the features of the .bof and .eof properties.

Hope it helps.

----------------------------
Visual Basic Professional 6.0