MS-Access query to only run once a day when first user opens.

I have an MS- Access database that needs to run a query whenever the user opens it for the first time in the day and only once a day. Is there code that I can run that will do this?
Thanks.
donnie91910Asked:
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Rey Obrero (Capricorn1)Commented:
one way to do this, which i have done in one of my application is to create a table with a Date/time field.

when the db is open, check if there is value in the Date field equal to the current date,
if no date found, run the query, then insert or update the date field with the current date.

got the idea?
donnie91910Author Commented:
I created a table called DateCheck with a field called ForDateCheck as a DateTime datatype.

So here is the code that I have written.  Please feel free to make any changes that you feel are syntacticly incorrect. Thanks.

Public Sub Check_Date()
If [DateCheck]![ForDateCheck] <> Now() Then
DoCmd.RunQuery "Qry_RunTestData"
Else
DoCmd.RunQuery "Qry_UpdateCheck_DateWithTodaysDate"
End If
End Sub
Hamed NasrRetired IT ProfessionalCommented:
Private Sub Form_Open(Cancel As Integer)
    Dim rs As Recordset
    Set rs = CurrentDb.OpenRecordset("DateCheck ")
    If rs("theDate") = Date Then
        Exit Sub
    Else
        rs.Edit
        rs("theDate") = Date   'theDate format is short Date such as dd/mm/yyyy
        ' now changes evey tick., you need to check per day
        rs.Update
        DoCmd.OpenQuery ("Qry_UpdateCheck_DateWithTodaysDate")
    End If
End Sub
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Rey Obrero (Capricorn1)Commented:
test this codes


Public Sub Check_Date()
If Nz(DLookup("ForDateCheck", "DateCheck")) <> Date Then
DoCmd.RunQuery "Qry_RunTestData"
    If DCount("*", "DateCheck") = 0 Then  'check if there is a date entry in the table
    ' add an entry if table is empty
    CurrentDb.Execute "Insert into DateCheck(ForDateCheck) values (#" & Date & "#)"
    Else
    'update the value of the date field to the current date
    CurrentDb.Execute "Update DateCheck set ForDateCheck=#" & Date & "#"
    End If
Else
DoCmd.RunQuery "Qry_UpdateCheck_DateWithTodaysDate"
   
    'update the value of the date field to the current date
    CurrentDb.Execute "Update DateCheck set ForDateCheck=#" & Date & "#"

End If
End Sub

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donnie91910Author Commented:
Can I run this code from a Macro in Access or do I need to change the code to a function.
Rey Obrero (Capricorn1)Commented:
* you can call the sub  in the open event of the form
* you can place the codes in the open event of the form
* you can change the Sub to a Function and run the Function from a macro

take your pick
donnie91910Author Commented:
I changed the code to a Function.  When I run the function from a Macro  I get the following Error:
RunTime error '2001':
You Cancelled the Previous Operation
    End         Debug

I choose Debug
and the first line of code is highlighted in yellow:

If Nz(DLookup("ForDateCheck", "DateCheck")) <> Date Then


By the way what is "Nz"?  Thanks.
donnie91910Author Commented:
Any ideas why this is happening?
donnie91910Author Commented:
Waiting for reply.
Hamed NasrRetired IT ProfessionalCommented:
Ceck this database implementing my comment.
Code can be used in form open event or in a butto click event.
runQueryOncePerDay.accdb
donnie91910Author Commented:
Thanks.
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