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- Path: sparky!uunet!gossip.pyramid.com!pyramid!infmx!davek
- From: davek@informix.com (David Kosenko)
- Newsgroups: comp.databases.informix
- Subject: Re: Updating within a scrolling cursor
- Message-ID: <1993Jan11.200006.8244@informix.com>
- Date: 11 Jan 93 20:00:06 GMT
- References: <1ik9fsINNhbe@emory.mathcs.emory.edu> <riskit-110193091454@47.201.0.36>
- Sender: news@informix.com (Usenet News)
- Organization: Informix Software, Inc.
- Lines: 41
-
- Reg Foulkes writes:
- >In article <1ik9fsINNhbe@emory.mathcs.emory.edu>, dave.snyder@snide.com
- >(Dave Snyder) wrote:
- >> Won't happen. First of all, I don't think you can access a cursor's tmp
- >> table. Second, even if you were using a real tmp table, when you execute
- >> the RUN command to do the INSERT, a new database process is started. The
- >> tmp table from your first database process is not available to any other
- >> database processes.
- >
- > Sorry but you are mistaken. Currently, I can create my own tmp table and
- >it works fine. I just wanted to bypass that step and go directly to the
- >temp table created by the open and do an insert before a fetch. This
-
- I don't believe this will work in every release. I just tried it using
- 5.0 OnLine, and the temp table I created was not available outside the
- session of the process that created it. Quoting the 5.0 SQL Reference
- Guide:
- [pg 7-86] "Once a temporary table is created, you can build
- indexes on the table. However, you are the only user who can
- see the temporary table."
-
- This does not explicitly define "user" but empirically I have found this to
- equate to "sqlturbo" (or sqlexec) and not userid.
-
- >saves me from creating the temp table. That I use for the fetch.
- >Unfortunately,
- >informix hides its' system temp tables so I am unable to use them. Why?
-
- Because we reserve the right to change how we implement something like
- scroll cursors. If access were given to these (currently) temp tables,
- we would be obligated to always implement them in that fashion. A real
- example of this is ORDER BYs: they were once implemented using temp
- tables with an index on them (X.10.03), but are now done using a
- quicksort variant with temp files (but not temp tables).
-
- Dave
- --
- Disclaimer: These opinions are not those of Informix Software, Inc.
- **************************************************************************
- "I look back with some satisfaction on what an idiot I was when I was 25,
- but when I do that, I'm assuming I'm no longer an idiot." - Andy Rooney
-