ACCESS FEED: Re: [MS_AccessPros] Update date field with Null

Kevin-

Does it work when there are valid dates? If so, then you simply need to check for "blank" dates and not run the queries. After calculating strGroupEnd, do this:

If Len(strGroupStart) = 0 Or Len(strGroupEnd) = 0 Then Exit Sub

John Viescas, author

Effective SQL

SQL Queries for Mere Mortals

Microsoft Office Access 2010 Inside Out

Microsoft Office Access 2007 Inside Out

Building Access Applications

http://www.viescas.com/

On May 2, 2017, at 13:00, qingqinga@yahoo.com [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:

Duane-

After running the debug.print as your instruction, when there's dates:

strGroupStart = 01-Jan-2018
strGroupEnd = 01-Jan-2018
strSQLThree = UPDATE tblGroup SET [GroupStart] = #01-Jan-2018# WHERE GroupID = 1
strSQLFour = UPDATE tblGroup SET [GroupEnd] = #01-Jan-2018# WHERE GroupID = 1

If there's no dates in the records, the outcome is like this:

strGroupStart =
strGroupEnd =
strSQLThree = UPDATE tblGroup SET [GroupStart] = ## WHERE GroupID = 1
strSQLFour = UPDATE tblGroup SET [GroupEnd] = ## WHERE GroupID = 1

Please help!

Best Regards,
Kevin

Zhao LiQing

Be adventurous, be bold, be careful, be a star !

--------------------------------------------
On Tue, 5/2/17, Duane Hookom duanehookom@hotmail.com [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:

Subject: Re: [MS_AccessPros] Update date field with Null
To: "MS_Access_Professionals@yahoogroups.com" <MS_Access_Professionals@yahoogroups.com>
Date: Tuesday, May 2, 2017, 6:23 PM

Kevin,

Debug.Print is a line of code that many of us use to test
values of memory variables etc. I would add it to your code
like:

    strGroupStart =
Nz(Format(DMin("PartItineraryDate",
"qryGetGroupStartEnd", "GroupID=" &
Me.Parent.GroupID), "dd-mmm-yyyy"), Null)

    debug.Print "strGroupStart
= " & strGroupStart

    strGroupEnd =
Nz(Format(DMax("PartItineraryDate",
"qryGetGroupStartEnd", "GroupID=" &
Me.Parent.GroupID), "dd-mmm-yyyy"), Null)

    debug.Print "strGroupEnd
= " &
strGroupEnd

    strSQLThree = "UPDATE tblGroup
" & "SET [GroupStart] = #" &
strGroupStart & "#" & " WHERE GroupID
= " & Me.Parent.GroupID

    debug.Print "strSQLThree
= " & strSQLThree

    strSQLFour = "UPDATE tblGroup
" & "SET [GroupEnd] = #" &
strGroupEnd & "#" & " WHERE GroupID =
" & Me.Parent.GroupID

    debug.Print "strSQLFour
= " & strSQLFour

    ' after running the code, open the debug
window (press Ctrl+G) to check the results.

    CurrentDb.Execute strSQLThree,
dbFailOnError

    CurrentDb.Execute strSQLFour,
dbFailOnError

Regards,
Duane Hookom
Switzerland

From:
MS_Access_Professionals@yahoogroups.com
<MS_Access_Professionals@yahoogroups.com> on behalf of
'KEVIN Z.' qingqinga@yahoo.com
[MS_Access_Professionals]
<MS_Access_Professionals@yahoogroups.com>

Sent: Tuesday, May 2, 2017 5:05 AM

To: MS_Access_Professionals@yahoogroups.com

Subject: Re: [MS_AccessPros] Update date field with
Null

Duane-

By the way, after running debug.print. the
error is:

Run-time error '424':

Object required

Best Regards,

Kevin

KEVIN Z.

Overprepare, then go with the flow.
在 "Duane Hookom
duanehookom@hotmail.com [MS_Access_Professionals]"
<MS_Access_Professionals@yahoogroups.com>，2017年5月2日
17:27写道：

Kevin,

What happened to the suggest Debug.Print statement? Which
line causes the error? What are the values stored in the
memory variables?

Your code doesn't match what I suggested. If
strGroupStart or strGroupEnd are null, you can't use the
"#" delimiters which are used for actual date
values.

If you want to resolve some of these issues you will need
to implement trouble-shooting functionality. You can also
set a breakpoint and step through your code.

Regards,
Duane Hookom
Switzerland

From:
MS_Access_Professionals@yahoogroups.com
<MS_Access_Professionals@yahoogroups.com> on behalf of
'KEVIN Z.' qingqinga@yahoo.com
[MS_Access_Professionals]
<MS_Access_Professionals@yahoogroups.com>

Sent: Tuesday, May 2, 2017 3:33 AM

To: MS_Access_Professionals@yahoogroups.com

Subject: Re: [MS_AccessPros] Update date field with
Null

Duane-

Here's the code:

Private Sub Command18_Click()

On Error GoTo ErrHandle

    Dim strGroupStart As String

    Dim strGroupEnd As String

    Dim strSQLThree As String

    Dim strSQLFour As String

    strGroupStart =
Nz(Format(DMin("PartItineraryDate",
"qryGetGroupStartEnd", "GroupID=" &
Me.Parent.GroupID), "dd-mmm-yyyy"), Null)

    strGroupEnd =
Nz(Format(DMax("PartItineraryDate",
"qryGetGroupStartEnd", "GroupID=" &
Me.Parent.GroupID), "dd-mmm-yyyy"), Null)

    strSQLThree = "UPDATE tblGroup
" & "SET [GroupStart] = #" &
strGroupStart & "#" & " WHERE GroupID
= " & Me.Parent.GroupID

    strSQLFour = "UPDATE tblGroup
" & "SET [GroupEnd] = #" &
strGroupEnd & "#" & " WHERE GroupID =
" & Me.Parent.GroupID

    CurrentDb.Execute strSQLThree,
dbFailOnError

    CurrentDb.Execute strSQLFour,
dbFailOnError

ErrExit:

    Exit Sub

ErrHandle:

    Resume ErrExit

End Sub

Best Regards,

Kevin

KEVIN Z.

Overprepare, then go with the flow.
在 "Duane Hookom
duanehookom@hotmail.com [MS_Access_Professionals]"
<MS_Access_Professionals@yahoogroups.com>，2017年5月2日
16:20写道：

Kevin,

We can't see your screen. What line causes the popup?
You have provided only one line of code. I expect there are
more that you haven't shared.

Regards,
Duane Hookom
Switzerland

From:
MS_Access_Professionals@yahoogroups.com
<MS_Access_Professionals@yahoogroups.com> on behalf of
'KEVIN Z.' qingqinga@yahoo.com
[MS_Access_Professionals]
<MS_Access_Professionals@yahoogroups.com>

Sent: Tuesday, May 2, 2017 3:12 AM

To: MS_Access_Professionals@yahoogroups.com

Subject: Re: [MS_AccessPros] Update date field with
Null

Duane-

Thanks a lot for your quick reply. The popup
says:

Run-time error '424':

Object required

Best Regards,

Kevin

KEVIN Z.

Overprepare, then go with the flow.
在 "Duane Hookom
duanehookom@hotmail.com [MS_Access_Professionals]"
<MS_Access_Professionals@yahoogroups.com>，2017年5月2日
14:34写道：

Kevin,

Try:
strSQLThree = "UPDATE tblGroup SET
[GroupStart] = Null WHERE GroupID = " &
Me.GroupID
Debug.Print strSQLThree   ' show me the
SQL

Regards,
Duane Hookom
Switzerland

From:
MS_Access_Professionals@yahoogroups.com
<MS_Access_Professionals@yahoogroups.com> on behalf of
'KEVIN Z.' qingqinga@yahoo.com
[MS_Access_Professionals]
<MS_Access_Professionals@yahoogroups.com>

Sent: Tuesday, May 2, 2017 1:19 AM

To: ms_access_professionals

Subject: [MS_AccessPros] Update date field with
Null

Dear All,

I was trying to update field with Null value,
bu failed. Please help! Thanks in advance.

Here's the code.

strSQLThree = "UPDATE tblGroup "
& "SET [GroupStart] = #" & Null &
"#" & " WHERE GroupID = " &
Me.GroupID

Best Regards,

Kevin

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Posted by: <zhao.liqing@yahoo.com>
------------------------------------

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Selasa, 02 Mei 2017

Re: [MS_AccessPros] Update date field with Null

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