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when DLookup function returns a NULL

Posted on 1998-07-29
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Last Modified: 2008-03-03
I am trying to write a sub that will loop through my tables to check if there is an entry in each table for a given subject number.  The DLookup function is the only way I know  to read data from other tables (besides the one the form is based on) but the sub stops running every time DLookup returns a null.  Should I be using a different function or is there a way to disable the error message that appears every time DLookup returns a null?
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Question by:alina072998
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devtha earned 100 total points
ID: 1957550
This example opens a Recordset and locates each record whose Title field satisfies the search criteria and copies it to the copy buffer.  The example prepares the record for subsequent editing, changes the job title, and saves the change using the Update method.

Dim Criteria As String, MyDB As Database, MySet As Recordset
Dim NewTitle As String
Criteria = "Title = 'Sales Representative'"      
' Set search criteria.
NewTitle = "Account Executive"      ' Set new job title.
Set MyDB = DBEngine.Workspaces(0).Databases(0)
Set MySet = MyDB.OpenRecordset("Employees", DB_OPEN_DYNASET)  
' Create dynaset.
MySet.FindFirst Criteria      ' Find first occurrence.
Do Until MySet.NoMatch      ' Loop until no matching records.
      MySet.Edit                  ' Enable editing.
      MySet!Title = NewTitle      ' Change title.
      MySet.Update            ' Save changes.
      MySet.FindNext Criteria      ' Find next occurrence.
Loop                         ' End of loop.


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Author Comment

by:alina072998
ID: 1957551
Thanks.  I think I get it.  To look through all of my tables for the same variable,
I would need to repeat the routine but change this:

Set MySet = MyDB.OpenRecordset("Employees", DB_OPEN_DYNASET)

statement, replacing the table name each time?
  
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LVL 6

Expert Comment

by:devtha
ID: 1957552
YOU GOT IT EXACTLY. BULL's EYE
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