Re: Adoption of RPG OA (Summary) -- RPG400-L

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On 3/21/2011 2:00 AM, Schmidt, Mihael wrote:

<snip>
A lot of your points are fine, but I just don't agree with this one. I
know EXACTLY what a CHAIN is doing - it's getting a set of fields from
the database. I know what it's doing, and I also know (roughly) how
long it's going to take. Perhaps most importantly I know that there are
zero side effects.
</snip>
You think you know exactly what a chain does ... and perhaps you are even correct about your assumptions but generally when something is done by the os or rdbms then it should be definitely considered a blackbox and one should read the API docs to know what to expect (in, out). Most people just assume too much.

No argument with reading the manual, but I'm really comfortable with how a CHAIN works. And I *know* that a CHAIN can never update the database. There are some things you can know, Mihael. That, by the way, is one reason I've always been a little leery of SQL. Talk about a black box - you're never quit sure WHAT that engine is doing.

:)

Joe

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