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Semi-OT: Functions and Aggregates in PostgreSQLby notsoevil (Pilgrim)
|on Oct 16, 2001 at 22:47 UTC||Need Help??|
notsoevil has asked for the wisdom of the Perl Monks concerning the following question:
You've probably noticed the topic is "Semi-OT". That's there because I am conflicted. My problem is not entirely centered about Perl (I used Perl as a Procedural language in PostgreSQL), but I have gotten to know that there is a breadth of knowledge here on other topics as well, due to the real-life experiences of my fellow monks. Now I am faced with a problem that may have been experienced by some of you out there, but I have no other effecient way of presenting you with it for advice.
So, I'll post here not seeking Perl Wisdom specifically, but seeking Wisdom of the Monks:
I have a sub in a Perl script that loops fetching the following statement (prepare once, execute once, a while loop for fetchrow_array)
And formats it like so:
A variable ($link_list) is in the loop, holding the concatenated last statement with the new one.
I would rather do this with FUNCTIONS (and/or AGGREGATES).
So, I CREATEd a FUNCTION:
So in my Perl script, the SQL statement becomes:
However, I still have to loop with Perl -- it would be nice to use an AGGREGATE to do some of this for me.
I can create an AGGREGATE but from what I can tell, the format of the sfunc can only have two parameters like so:
Where the first parameter is what was passed before, and the second parameter is the 'new' info to do stuff to. Is it not possible to do something similar to?:
So that I can pass the url and name to the AGGREGATE (so it can in turn pass it to the sfunc)? Where the sfunc could be something like so:
Because then I gain benefit of a stored procedure and cut the SQL in the script down to:
Which will return the entire list at once, instead of needing the script to loop through multiple fetches.
Of course, I may be going about this in an entirely incorrect manner. Telling me so, with a bit of direction, would also be greatly appreciated.