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Re: SQL-Invoked Procedures for 8.1

From: Joe Conway <mail(at)joeconway(dot)com>
To: Gavin Sherry <swm(at)linuxworld(dot)com(dot)au>
Cc: Oliver Jowett <oliver(at)opencloud(dot)com>,Grant Finnemore <grantf(at)guruhut(dot)co(dot)za>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: SQL-Invoked Procedures for 8.1
Date: 2004-09-23 15:56:15
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Gavin Sherry wrote:
> Do you have any idea about databases returning result sets from SQL
> procedures (ie, not functions).

As other's have pointed out, this is very common in the MS SQL Server 
world (and I believe Sysbase also supports it). It works like:

<begin proc def>

select * from something
select * from somethingelse

<end proc def>

We get requests for this kind of functionality at least a couple of 
times a month, and although it's been a few years since I mucked with 
MSSQL, I found it to be very useful in a number of different circumstances.

It is only workable because stored procedures cannot participate in 
normal SELECT statements. In MSSQL you would do something like:

   exec sp_my_multiresultset_proc
-- or --

so the analogy to your stored procedure proposal holds:

   call sp_my_multiresultset_proc();
-- or --

I had always envisioned implementing this by projecting tuples directly 
the way that SHOW ALL or EXPLAIN ANALYZE do. See, e.g. 
ShowAllGUCConfig() in guc.c.


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