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Function empty() and null value
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À
26/06/2011 20:15:28
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Versions des environnements
Visual FoxPro:
VFP 9 SP1
Divers
Thread ID:
01516146
Message ID:
01516149
Vues:
52
>>Hi,
>>
>>When using SQL Server and allowing NULL in empty dates I came across a small issue where EMPTY( date_field) returns .F. when the entry in date_field is NULL. And this of course breaks a lot of code where the program relied on the date field being empty. I am thinking of creating a simple function like this:
>>
>>Function MyEmpty
>>lparameter tDate
>>if empty( tDate) or isnull( tDate)
>>   return .T.
>>else
>>  return .F.
>>endif 
>>
>>
>>And replace everywhere in the program where I use
>>
>>if EMPTY( date_field ) 
>>
>>with
>>
>>if MyEmpty( date_field )
>>
>>
>>Can anybody see a potential problem with the above approach? TIA.
>
>IF EMPTY(nvl(datefield,{})).....

I think your approach is probably better. Except a little more characters to type when making changes <g>. Thank you.
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