Subject RE: [firebird-support] Update numeric problem
Author Svein Erling Tysvær

update mytable set total=total+10.12 where mykey=10

doesn't do what it is supposed to do, then there's a serious problem with Firebird. I haven't heard of such a problem before, and wonder if you may have simplified your problem too much? If it was two statements running in separate transactions - like

SELECT total FROM MyTable
UPDATE MyTable SET total = :total + 10.12

then it would be easy to understand, but within one statement, it simply doesn't sound right.

So please tell us more, which transaction isolation do you use, which version of Firebird, any programming language etc. Have you observed the problem by simply running your update statement using isql, FlameRobin or similar?


-----Original Message-----
From: [] On Behalf Of timothysshea
Sent: 23. august 2010 10:04
Subject: [firebird-support] Update numeric problem

I am having a problem where the following :

update mytable set total=total+10.12 where mykey=10

Simply doesn't work; occasionally. The numeric field is not null and no error is reported. The numeric field (total) is not updated.

The command

update mytable set total=22.2 where mykey=10

always works.

update mytable set total=total+10.12, databasename='Firebird' where mykey=10

always updates databasename to 'Firebird', but sometimes does not update total.

Seems to happen on Terminal Servers more than other systems.
Using Win32 Firebird 2.1.3, Superserver via the ODBC driver build, but happened with Firebird 2.0 as well.

This seems like a pretty basic problem and only happens occasionally. Otherwise, Firebird appears to be virtually bulletproof.

Any ideas?

Thanks in advance.