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Dllookup

Posted on 2011-03-06
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Last Modified: 2012-05-11
I am struggling with the syntax for a Dlookup in the where section

Dim SC As Long
Dim MaxLD As Date
MaxLD = DMax("qry_SecurityCheck.[LoginDate]", "qry_SecurityCheck")
SC = DLookup("[SecurityLevel]", "qry_SecurityCheck", "qry_SecurityCheck.[LoginDate]='" & MaxLD & "'")

I keeping getting expression mismatch errors or syntax errors as i play withe format
MaxLD is date-time format.

Any help welcome, thanks
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Question by:SweetingA
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8 Comments
 
LVL 75
ID: 35046995
Assuming LoginDate is a Date (?) ... try this

Dim SC As Date  ' change this is you are returning a Date ..?
Dim MaxLD As Date
MaxLD = DMax("qry_SecurityCheck.[LoginDate]", "qry_SecurityCheck")

SC = DLookup("[SecurityLevel]", "qry_SecurityCheck", "[LoginDate]= #" & MaxLD & "#")

mx
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DatabaseMX (Joe Anderson - Access MVP) earned 500 total points
ID: 35047051
Please indicate the data type for LoginDate (Date)..  and SecurityLevel (Long ?)

Try this mod .....

Dim SC As LONG ' I put this back to Long ...
Dim MaxLD As Date
MaxLD = DMax("[LoginDate]", "qry_SecurityCheck")

SC = DLookup("[SecurityLevel]", "qry_SecurityCheck", "[LoginDate]= #" & MaxLD & "#")

mx
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LVL 31

Expert Comment

by:Helen_Feddema
ID: 35047115
Try setting a String variable for use as the filter.  This allows you to check that it has appropriate values, by displaying it in the Immediate window.
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LVL 49

Expert Comment

by:Gustav Brock
ID: 35060698
You need to format a string expression of your MaxLD:

Dim SC As Long
Dim MaxLD As Date
Dim strMaxLD As String
MaxLD = DMax("qry_SecurityCheck.[LoginDate]", "qry_SecurityCheck")
strMaxLD = Format(MaxLD, "yyyy\mm\dd")
SC = DLookup("[SecurityLevel]", "qry_SecurityCheck", "qry_SecurityCheck.[LoginDate]=#" & strMaxLD & "#")

/gustav
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LVL 31

Expert Comment

by:Helen_Feddema
ID: 35061540
If LoginDate is a Date field, then filtering it with a String variable is problematic.  You should use a Date variable for this purpose.
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LVL 31

Expert Comment

by:Helen_Feddema
ID: 35061564
Here is a typical SQL string using a Date variable:
strSQL = "SELECT * FROM " & strRecordSource & " WHERE " _
   & "[dteDateReceived] Between " & Chr(35) & dteFromDate _
   & Chr(35) & " And " & Chr(35) & dteToDate & Chr(35) & ";"

Open in new window

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LVL 31

Expert Comment

by:Helen_Feddema
ID: 35061577
Chr(35) is the same as the # sign.
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LVL 49

Expert Comment

by:Gustav Brock
ID: 35061706
Helen, that won't work.

Criteria in the domain functions must be string expressions. If not, the value will be casted to a string anyway but outside your control - a date/time value will be casted using the current locale which - as this is in Central Europe - most likely will be dd-mm-yyyy. As the domain functions expect the mm/dd/yyyy format, month and date will be interchanged for values of 12 or less causing errors.

The ISO format yyyy-mm-dd is accepted as well, and as this in mandatory for ADO and preferred for SQL Server, you can just as well make turn it into a habit to format date/time string expressions to the ISO format.

/gustav
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