My sense is that you are right in that it is doing an 'Update where'
execution, but how would it determine the 'where' values?
How did you select the record to update in Squirrel?


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of James Lampert
Sent: Thursday, January 03, 2013 6:53 PM
To: Midrange Systems Technical Discussion
Subject: Re: Uniquely identifying a record in SQL without a unique key?

Another experiment:

I created a non-keyed copy of VIEWCUS, then deliberately created an exact
duplicate record.

Then, I opened the file in Squirrel, and changed one of the pair of
identical records.

Squirrel gave me a warning that the change would affect both records, then,
when I told it to proceed, it did change both records.

I'm not sure, but I think that's telling me that Squirrel doesn't hold an
open cursor on the file, but instead does an UPDATE with a WHERE clause
built from the record being updated.

I definitely need a good JDBC tutorial, one that gets into the ins and outs
of result sets and their cursors.

(And if there are any Squirrel SQL experts here, would anybody happen to
know of a way to see what requests Squirrel is actually sending?)
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