RE: UDB question -- MIDRANGE-L

We have gone through a slow process of doing all new development using
SQL DDL instead of DDS because of tools and the ability to map it so an
NT DB2 database for testing, etc.  Especially now that stored procedures
and triggers can be SQL based (5.1 with the built in C compiler), it
makes the code more "portable".

But you already have UDB on the 400 - opps iSeries.  Now you can go back
to management (after the holidays) and tell them you spent the whole
time off working on implementing it, and did it without spending any
money on your own time!

jb

John Bussert
Swift Technologies, Inc.
www.swiftorder.com
847-289-8339
847-289-8939 (fax)
jbussert@swiftorder.com


-----Original Message-----
From: R. Bruce Hoffman, Jr. [mailto:rbruceh@attglobal.net]
Sent: Thursday, December 20, 2001 9:01 AM
To: midrange-l@midrange.com
Subject: Re: UDB question

----- Original Message -----
From: "Dan Rasch" <drasch@mail.win.org>
To: <midrange-l@midrange.com>
Sent: Wednesday, December 19, 2001 1:37 PM
Subject: UDB question


> I was just told there is a directive from management to look into
> UDB for the 400's DB2.  Apparently the claim is that if we replace
> our DDS with SQL definitions, we can change file defs (like adding
> fields to the end of the record) without the level checks.

Level checks are not caused by the definition (DDL of SQL) but the
access
and manipulation of data (DAL of SQL) through programs that refer
directly
to the file and it's external definition.

SQL _access_ (select, delete, insert, update) if done _without_  the *
(ie.
select * from a into bstruct) will ignore level differences on the
record
because it looks at the field level, not the record level for its data.

As for UDB, on the 400 it's just a name. If you have an AS400 or
iSeries,
then you have "DB2 UDB for OS/400". There are three flavors (and
producers)
of DB2 UDB. One runs on the 400, one runs on 390 architecture and (IMO
the
true UDB) the last runs on just about everything else with a common code
base and comes from Toronto.

The 400's version of DB2, in many cases, lags behind the facilities of
the
"all platform" version of UDB and the 390's version. The glaring
exception
was EVIs which made it to the 400 first. But the 400 still does not
support
grouping sets, rollup and cube operations, although it finally has
declaritive triggers, and more than 6 allowed.

Also IMO, switching the definition to SQL allows you to use tools for
database design, modelling, creation, maintenance and documentation. All
well worth the effort.

===========================================================
R. Bruce Hoffman, Jr.
 -- IBM Certified Specialist - iSeries Administrator
 -- IBM Certified Specialist - RPG IV Developer

"I want to be different, just like everybody else!"
  - Ceili Rain



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