custom message in constraint fail in SQL

welll sorry experts for assigning less points!!!!i don't have the points.

i have foll questions like:

1. I have added a constrainst in my table on one field. Now when i am trying to insert the records(which violates the constrainst) an error message is generated. Now can i custmize this error message.

2. For some other table I am raising the error message insidde a trigger using raiserror command. Is it possible to raise a message instead of an error message. Inside my application, it shows only the OK button. Is it possible to send a message with YES/NO button. As far as i know it is not possible. Just to confirm it.

3. The reason why i am doing all this is because our client has brought a package from outside agency. Now we have got the responsibility to add business logic in this package thry Backend(SQL) using triggers etc. Are there any other ways i can implement busiess logic in this application.

I know i have very less points. As soon as i will get more points i will keep on adding!!!
LVL 3
pg_indiaAsked:
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Anthony PerkinsCommented:
Please maintain your many old open questions:

1 03/20/2003 50 CD KEY INSTALLATION  Open Windows Security
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Thanks,
Anthony
0
arbertCommented:
You cannot customize the constraint error messages.  Generally, you capture the errors in your front-end application and re-display the errors as something meaningful to your client.


"2. For some other table I am raising the error message insidde a trigger using raiserror command. Is it possible to raise a message instead of an error message. Inside my application, it shows only the OK button. Is it possible to send a message with YES/NO button. As far as i know it is not possible. Just to confirm it.
"

What  are you using to create your application?  You should be able to present the user with a form or message box that contains Yes/No....
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pg_indiaAuthor Commented:
Thanks Albert for your help and acperkins yes i am closing my old question.Don't worry abt it.See i have increased the points by 100.

Basically its a exe which we have got from third party. So weccont change anythg in it. Should i assume then that it is not possible from SQL Server.

Also i want to know:
Are there any other ways i can implement busiess logic in this application??

Any help will be apprecirated.


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arbertCommented:
So if you can't change the application, how would you possibly change the business logic in it?????

If you can't change the application, it pretty much becomes a training issue--that's the way it is and you just train your users to get use to it.

Can you request the vendor make more descriptive error messages?

Brett
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pg_indiaAuthor Commented:
i understand that but usiness logic can be implemented at SQL level also. Not 100% but we can do some validations etc etc. Now i want to know various ways of doing that through SQL as the application is able to handle SQL errors and display them.

An example is suppose i don't want user to enter age in negative in table "customer" lets say age field. Now i can write a trigger on customer where i can do validation that if age <=0 then raiseerror with some error number and the application is able to show that error. This much i have completed but i need to know if there any other ways of doing the same. Can i send some message also instead of the error message!!!
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arbertCommented:
Nope, you're stuck with the sql errors....Also, instead of the trigger--use a constraint--best practice.....

Personally, if I had to code a bunch of extra logic on the backend to handle stuff like that--I would be searching for a different front end.....
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