Re: IF EXISTS

Ok, thanks, Jeff.
This is not a critical problem. Just annoying. I'll wait for 8.2.
BTW, while I can see the reason for adding the IF EXISTS clause to the
language for checking the existence of objects, wouldn't it be easier to
simply provide the PL/PgSQL language for script loading? Then it would be
possible to create scripts for database maintainance that could be run
periodically without having to make them functions stored in the database.
Just a thought.
Cheers!

Jeff Davis-8 wrote:
>
> On Wed, 2006-09-20 at 14:18 -0700, stevethames wrote:
>> I have a script that sets up my databases which I run whenever I change
>> any
>> of the functions. It has a number of things it does that are unnecessary
>> and cause errors. I create some types, sequences, etc. The error
>> messages
>> are irritating. I'd like to do something like this:
>>
>> IF NOT EXISTS (SELECT relname FROM pg_class WHERE relname='seqid')
>> CREATE SEQUENCE SeqID;
>>
>> This works in other SQL languages like SQLServer and MySQL. Is there
>> anything like this in PostgreSQL?
>>
>
> In 8.2, which is currently still in production, they have added the
> feature where you can do things like:
>
> DROP SEQUENCE IF EXISTS mysequence;
> CREATE SEQUENCE mysequence;
>
> Which makes writing SQL scripts much easier. They also made it work for
> other objects, like DROP TABLE IF EXISTS, etc.
>
> This might not help you, because 8.2 is still months away from being
> "production quality". However, a beta isn't too far off and you may be
> interested to check it out. At least you know the code you want is
> already written :)
>
> I think the DROP IF EXISTS syntax makes more sense than CREATE IF NOT
> EXISTS, because normally the purpose of this type of thing is to reset
> your tables or sequences to the starting state.
>
> Regards,
> Jeff Davis
>
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
> choose an index scan if your joining column's datatypes do not
> match
>
>

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