|Subject||Re: Which way would be best ?|
>At 10/20/2001 09:15 PM (Saturday), bossman@... wrote:Thanks for the comments.
>>So I'm wondering for ease of validation and support would one do the
>>validation on the client or the server ?
>>If the answer is the server side then validation is to be done via
>>Stored procedure or trigger ??
>If I understand correctly, you want to check if either the street address
>or PO Box are entered and that the location is entered.
>If that's all you want to validate then I don't think there is an issue
>with "ease of validation and support". Here are some relevant issues: Put
>the validation in one place only if you can. This means on the client in a
>ValidateData method which can be called from the TButton.OnClik handler or
>elsewhere. (The Windows Way is to call this from the OnChange handler for
>the street address, PO Box, and Location edit controls and enable the Close
>button only when the data is fully valid.)
>Te biggest reason to perform this validation at the server is if the
>database will be accessed by other software than your application. In that
>case you want ALL applications to perform the same validation in order to
>ensure the integrity of the data. However, you will need to add it to both
>a BEFORE INSERT trigger and a BEFORE UPDATE trigger. It will be messier to
>use a stored procedure due to the limitations of passing parameters to
>stored procedures (you cannot pass the whole record and let the stored
>procedure decide which fields it wants to examine). Therefore, your code
>will be duplicated.
>Also, if the validation is done at the server you will need to define an
>exception which can be detected back at the client when the validation
>fails. You will then need to pay attention to transaction handling back in
>the client to rollback after the exception occurs.
>Overall, much easier to do the validation on the client in the OnChange
>handlers. Be sure to document for the user why the Close button is not
>enabled when they think it should be!
>Delphi 2.0? Wow!
What you've said is what i thought but wanted someone elses thoughts.