I generally prefer validation rather than an expectation of exceptions. What
about using the EXISTS?

I think this should work

if EXISTS (select keyword from table where keyword = '#keyword#')
  -- do nothing
ELSE
  -- do insert



On Thu, Jan 27, 2011 at 6:06 PM, Michael Dinowitz <
[email protected]> wrote:

>
> I'm inserting a keyword into a table that only contains unique keywords (db
> constraint). I'm currently doing a select to see if the keyword already
> exists and then an insert if it does not. This 2 step process is what I
> think of as 'correct'. First check, then act.
>
> After a little thought, the 'wrong' way might be better in this case. The
> wrong way is to just try the insert without first checking if the value
> already exists. If it fails, a try/catch deals with it. As messy as this
> sounds, it saves a full step and is probably the more efficient of the two.
>
> Am I wrong to think that the second method is wrong? Should I do it this
> way?
>
> Thanks
>
> Michael Dinowitz
>
>
> 

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