Ms Access Dlookup Error Displayed
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Ms Access Dlookup In Query Expression
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Bellamy Newly Registered User Join Date: Dec 2005 Posts: 295 Thanks: 6 Thanked 1 Time ms access dlookup multiple fields in 1 Post Trapping a DLookup error Is there a neat way of trapping the error and carrying on with the code from ms access dlookup last record Dlookup when it finds the field it is looking for is empty (not null but empty)? Up till now I have trapped it by its error number then returned back to the code, but there must be better way? http://www.utteraccess.com/forum/dlookup-returns-error-t1945101.html Cheers Peter Bellamy View Public Profile Find More Posts by Peter Bellamy 01-28-2010, 01:21 PM #2 vbaInet AWF VIP Join Date: Jan 2010 Location: U.K. Posts: 26,373 Thanks: 0 Thanked 2,403 Times in 2,372 Posts Re: Trapping a DLookup error Quote: Originally Posted by Peter Bellamy Is there a neat way of trapping the error and carrying on with the code from Dlookup when it finds the field it is looking http://www.access-programmers.co.uk/forums/showthread.php?t=187273 for is empty (not null but empty)? Up till now I have trapped it by its error number then returned back to the code, but there must be better way? Cheers Read this from one the forum's gurus: http://www.baldyweb.com/NullEmptyEtc.htm vbaInet View Public Profile Find More Posts by vbaInet 01-28-2010, 01:25 PM #3 pbaldy Wino Moderator Join Date: Aug 2003 Location: Nevada, USA Posts: 28,922 Thanks: 6 Thanked 3,236 Times in 3,182 Posts Re: Trapping a DLookup error In my view, there are two general schools of thought regarding error trapping. One is "code to prevent foreseeable errors and let the error trap catch unforeseen errors", the other is "let the error trap handle everything". I generally belong to the former, so I would have: Variable = DLookup(...) If Len(Variable & vbNullString) = 0 Then where the If statement will catch the result either being Null or a ZLS. __________________ Paul Microsoft Access MVP To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. pbaldy View Public Profile Find More Posts by pbaldy 01-28-2010, 11:31 PM #4 Peter Bellamy Newly Registered User Join Date: Dec 2005 Posts: 295 Thanks: 6 Thanked 1 Time in 1 Post Re: Trapping a DLookup error Thanks both. I agree with
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companies, you will have a Company table that contains all the company's details including a CompanyID field, and a Contract table that stores just the CompanyID to look up those details. Sometimes you can base your form or report on a query that contains all the additional tables. Other times, DLookup() will be a life-saver. DLookup() expects you to give it three things inside the brackets. Think of them as: Look up the _____ field, from the _____ table, where the record is _____ Each of these must go in quotes, separated by commas. You must also use square brackets around the table or field names if the names contain odd characters (spaces, #, etc) or start with a number. This is probably easiest to follow with some examples: you have a CompanyID such as 874, and want to print the company name on a report; you have Category such as "C", and need to show what this category means. you have StudentID such as "JoneFr", and need the student?s full name on a form. Example 1: Look up the CompanyName field from table Company, where CompanyID = 874. This translates to: =DLookup("CompanyName", "Company", "CompanyID = 874") You don't want Company 874 printed for every record! Use an ampersand (&) to concatenate the current value in the CompanyID field of your report to the "Company = " criteria: =DLookup("CompanyName", "Company", "CompanyID = " & [CompanyID]) If the CompanyID is null (as it might be at a new record), the 3rd agumenent will be incomplete, so the entire expression yields #Error. To avoid that use Nz() to supply a value for when the field is null: =DLookup("CompanyName", "Company", "CompanyID = " & Nz([CompanyID],0)) Example 2: The example above is correct if CompanyID is a number. But if the field is text, Access expects quote marks around it. In our second example, we look up the CategoryName field in table Cat, where Category = 'C'. This means the DLookup becomes: =DLookup("CategoryName", "Cat", "Category = 'C'") Single quotes within the double quotes is one way to do quotes within quotes. But again, we don't want Categoy 'C' for all records: we need the current value from our Category field patched into the quote. To do this, we close the quotation after the first single quote, add the contents of Category, and then add the trailing single quote. This becomes: =DLookup("CategoryName", "Cat", "Category = '" & [Category] & "'") Example 3: In our third example, we need the full name from a Student table. But t