"Raoul Watson" <Wa*****@IntelligenCIA.com> wrote in message
news:DTY%f.715$UK5.619@trndny01...
I have used isNull statement for as long as I have used VB..
Recently I am devugging a program and it is very clear that the "IsNull"
function sometimes would return a true even when the value is not Null.
Any wild shot or theory as to why this is happening is appreciated. Also, any
other alternative is appreciated since I am stuck and cannot proceed
without fixing this issue (tried = Null and that doesn't work either).
Basically, I have a field in a databsse which could be null, so in the
code i have:
' mfld(x) would have field names like "NAME" etc.
If IsNull(datPrimaryRS.Recordset(mfld(x))) Then
fvalue = ""
Else
fvalue = datPrimaryRS.Recordset(mfld(x))
End If
I have verified by stepping that isNull is true while moving the cursor
shows
"Steven Moss" in datPrimaryRS.Recordset(mfld(x))
What gives?
That is strange.
The situation where IsNull fails with 'Empty' is well-documented. (ie, some
databases will reset a field (text, nullable) that once had a value back to
Empty or " ", and not Null when the value is deleted), and other issues.
But I have never encountered the situation were a value existed and IsNull
failed. However, the Field.Values in a Recordset collection are Variants and
occasionally a strange dance (or joint psychosis) can develop based on the
Field data type attributes, the SQL used to fetch the data, and whether you
have previous dereferenced the value in your code.
You might go back and see if you can find something unusual about this
particular Field and its history.
There is simple workaround in this case. Use this instead...
fvalue = datPrimaryRS.Recordset(mfld(x)) & ""
hth
-ralph