I need to make sure that I am on a different record than I just was
on, in a DAO recordset.
code fragment:
1. strFind = "thisSource = " & tripID & " AND thisTrip = " & tripID
2. rs.FindFirst (strFind)
3. If Not rs.NoMatch Then
4. strBookmark = rs.Bookmark
5. rs.MoveFirst
6. If rs.Bookmark = strBookmark Then rs.MoveNext
7. ...and so on
it wont compile because of a type mismatch, highlighting the equal
sign on line 6; not on line 4.
I have cast my bookmark variable as string, long, variant, with the
same result. I can probably do this another way, but I want to know
why it isn't working this way, first. -tc
11  4267 
From memory, bookmarks are case-sensitive variants.
Try declaring:
Dim varBookmark As Variant
Then at line 4:
varBookmark = rs.Bookmark
Then at line 6:
If StrComp(rs.Book mark, varBookmark, vbBinaryCompare ) = 0 ...
--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
"Tom Clavel" <to*******@oura ynet.comwrote in message
news:11******** **************@ e65g2000hsc.goo glegroups.com.. .
>I need to make sure that I am on a different record than I just was
on, in a DAO recordset.
code fragment:
1. strFind = "thisSource = " & tripID & " AND thisTrip = " & tripID
2. rs.FindFirst (strFind)
3. If Not rs.NoMatch Then
4. strBookmark = rs.Bookmark
5. rs.MoveFirst
6. If rs.Bookmark = strBookmark Then rs.MoveNext
7. ...and so on
it wont compile because of a type mismatch, highlighting the equal
sign on line 6; not on line 4.
I have cast my bookmark variable as string, long, variant, with the
same result. I can probably do this another way, but I want to know
why it isn't working this way, first. -tc
Thanks. It works just right. -tc
On Apr 22, 10:07 pm, "Allen Browne" <AllenBro...@Se eSig.Invalid>
wrote:
From memory, bookmarks are case-sensitive variants.
Try declaring:
Dim varBookmark As Variant
Then at line 4:
varBookmark = rs.Bookmark
Then at line 6:
If StrComp(rs.Book mark, varBookmark, vbBinaryCompare ) = 0 ...
--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users -http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
"Tom Clavel" <tomcla...@oura ynet.comwrote in message
news:11******** **************@ e65g2000hsc.goo glegroups.com.. .
I need to make sure that I am on a different record than I just was
on, in a DAO recordset.
code fragment:
1. strFind = "thisSource = " & tripID & " AND thisTrip = " & tripID
2. rs.FindFirst (strFind)
3. If Not rs.NoMatch Then
4. strBookmark = rs.Bookmark
5. rs.MoveFirst
6. If rs.Bookmark = strBookmark Then rs.MoveNext
7. ...and so on
it wont compile because of a type mismatch, highlighting the equal
sign on line 6; not on line 4.
I have cast my bookmark variable as string, long, variant, with the
same result. I can probably do this another way, but I want to know
why it isn't working this way, first. -tc
Tom Clavel <to*******@oura ynet.comwrote in
news:11******** **************@ e65g2000hsc.goo glegroups.com:
I need to make sure that I am on a different record than I just
was on, in a DAO recordset.
code fragment:
1. strFind = "thisSource = " & tripID & " AND thisTrip = " &
tripID 2. rs.FindFirst (strFind)
3. If Not rs.NoMatch Then
4. strBookmark = rs.Bookmark
5. rs.MoveFirst
6. If rs.Bookmark = strBookmark Then rs.MoveNext
7. ...and so on
it wont compile because of a type mismatch, highlighting the equal
sign on line 6; not on line 4.
I have cast my bookmark variable as string, long, variant, with
the same result. I can probably do this another way, but I want
to know why it isn't working this way, first.
Why are you storing the bookmark? Are you going to keep track of
more than one bookmark at a time?
Wouldn't what you are doing make much more sense testing real values
in the records, instead of the bookmarks?
I have never once stored a bookmark in a variable, so don't quite
see the point. It's data that is much too volatile to be stored,
seems to me.
--
David W. Fenton http://www.dfenton.com/
usenet at dfenton dot com http://www.dfenton.com/DFA/
On Apr 23, 10:16 am, "David W. Fenton" <XXXuse...@dfen ton.com.invalid >
wrote:
Tom Clavel <tomcla...@oura ynet.comwrote innews:11****** *************** *@e65g2000hsc.g ooglegroups.com :
I need to make sure that I am on a different record than I just
was on, in a DAO recordset.
code fragment:
1. strFind = "thisSource = " & tripID & " AND thisTrip = " &
tripID 2. rs.FindFirst (strFind)
3. If Not rs.NoMatch Then
4. strBookmark = rs.Bookmark
5. rs.MoveFirst
6. If rs.Bookmark = strBookmark Then rs.MoveNext
7. ...and so on
it wont compile because of a type mismatch, highlighting the equal
sign on line 6; not on line 4.
I have cast my bookmark variable as string, long, variant, with
the same result. I can probably do this another way, but I want
to know why it isn't working this way, first.
Why are you storing the bookmark? Are you going to keep track of
more than one bookmark at a time?
Wouldn't what you are doing make much more sense testing real values
in the records, instead of the bookmarks?
I have never once stored a bookmark in a variable, so don't quite
see the point. It's data that is much too volatile to be stored,
seems to me.
--
David W. Fenton http://www.dfenton.com/
usenet at dfenton dot com http://www.dfenton.com/DFA/- Hide quoted text -
- Show quoted text -
Bookmarks are strings in case anyone wants to know. I've used them a
lot to mark records or to position to a specific record in a form. If
I remember correctly (always an issue!), one of the form wizards uses
bookmarks in the generated code.
-- Larry Engles
Access developer since day 1 of Access 1.0
<en****@ridesof t.comreplied in message
news:11******** *************@o 40g2000prh.goog legroups.com...
Bookmarks are strings in case anyone wants to know.
Larry, that's not strictly correct. Bookmarks are a variant array of bytes.
You can make them display like strings, but attempting to use them as
strings can fail. That's exactly what the original poster in this thread
discovered.
--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
On Apr 23, 9:54 pm, "Allen Browne" <AllenBro...@Se eSig.Invalidwro te:
<eng...@ridesof t.comreplied in messagenews:11* *************** *****@o40g2000p rh.googlegroups .com...
Bookmarks are strings in case anyone wants to know.
Larry, that's not strictly correct. Bookmarks are a variant array of bytes.
You can make them display like strings, but attempting to use them as
strings can fail. That's exactly what the original poster in this thread
discovered.
--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users -http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
I did not know that. I've always declared them as strings and have
never had a problem. I see (now) that help shows them being used as
variants. If I recall, I experimented (we're talking Access 1.1 or
2.0 probably) to find how to declare them.
It's not clear to me how an "array of bytes" differs from a string.
Is it a zero terminator?
Thanks,
-- Larry Engles
Access developer since day 1 of Access 1.0
It is possible to visualize a string as an array of bytes. Some languages
(e.g. Pascal) do that.
However, strings may not be bytes, e.g. Unicode. And strings in some
languagues are null terminted, so the first chr(0) in the string would be
interpreted as the end of the string.
In VBA, strings are not arrays:
? IsArray("Hello" )
whereas bookmarks are:
? IsArray(Forms(0 ).Bookmark))
(assuming the first form is open, bound, and not at a new record.)
Treating a bookmark as as string wrongly reports it as 2 characters long:
? Len(Forms(0).Bo okmark) 'WRONG!
In fact, it is an array of 4 bytes:
Sub ExamineBM()
Dim varBM As Variant
Dim i As Long
Dim bt As Byte
varBM = Forms(0).Bookma rk
For i = LBound(varBM) To UBound(varBM)
bt = varBM(i)
Debug.Print bt
Next
End Sub
A bookmark is therefore more like IP address than a string.
--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
<en****@ridesof t.comwrote in message
news:11******** **************@ r30g2000prh.goo glegroups.com.. .
On Apr 23, 9:54 pm, "Allen Browne" <AllenBro...@Se eSig.Invalidwro te:
><eng...@rideso ft.comreplied in
messagenews:11 *************** ******@o40g2000 prh.googlegroup s.com...
Bookmarks are strings in case anyone wants to know.
Larry, that's not strictly correct. Bookmarks are a variant array of
bytes.
You can make them display like strings, but attempting to use them as
strings can fail. That's exactly what the original poster in this thread
discovered.
--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users -http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
I did not know that. I've always declared them as strings and have
never had a problem. I see (now) that help shows them being used as
variants. If I recall, I experimented (we're talking Access 1.1 or
2.0 probably) to find how to declare them.
It's not clear to me how an "array of bytes" differs from a string.
Is it a zero terminator?
Thanks,
-- Larry Engles
Access developer since day 1 of Access 1.0
en****@ridesoft .com wrote in
news:11******** *************@o 40g2000prh.goog legroups.com:
If
I remember correctly (always an issue!), one of the form wizards
uses bookmarks in the generated code.
It uses them but does not store them. I use them just the way the
wizard does, for bookmark navigation, but I would never store a
bookmark value.
I can't come up with a reason for doing so.
If I want to navigate to a particular record after departing it to
go to another, I store the PK of the record and navigate to that.
That insures that a requery in between won't invalidate the value
I'm storing.
Can anyone come up with a scenario where storing a bookmark value is
the only way to accomplish the task?
--
David W. Fenton http://www.dfenton.com/
usenet at dfenton dot com http://www.dfenton.com/DFA/
David, I almost never store a bookmark in a variable either, but I have used
this occassionally:
Dim varBM As Variant
varBM = rs.Bookmark
'move the recordset somewhere else, e.g. to read a value
rs.Bookmark = varBM
Using a bookmark to return to the record is (reportedly) the most efficient
approach - certainly faster than FindFirst.
And Access does store maintain some bookmarks in memory too, such as
LastModified.
--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
"David W. Fenton" <XX*******@dfen ton.com.invalid wrote in message
news:Xn******** *************** ***********@127 .0.0.1...
en****@ridesoft .com wrote in
news:11******** *************@o 40g2000prh.goog legroups.com:
>If
I remember correctly (always an issue!), one of the form wizards
uses bookmarks in the generated code.
It uses them but does not store them. I use them just the way the
wizard does, for bookmark navigation, but I would never store a
bookmark value.
I can't come up with a reason for doing so.
If I want to navigate to a particular record after departing it to
go to another, I store the PK of the record and navigate to that.
That insures that a requery in between won't invalidate the value
I'm storing.
Can anyone come up with a scenario where storing a bookmark value is
the only way to accomplish the task?
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