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Thread: Transaction

Transaction

From
"Mihai Gheorghiu"
Date:
An event triggers a rule / trigger.
Does this (event + rule/trigger) behave as a transaction, or is it necessary
to wrap it into BEGIN COMMIT? If yes, BEGIN should be before or after the
event (in the rule/trigger)?

Re: Transaction

From
Stephan Szabo
Date:
On Mon, 17 Sep 2001, Mihai Gheorghiu wrote:

> An event triggers a rule / trigger.
> Does this (event + rule/trigger) behave as a transaction, or is it necessary
> to wrap it into BEGIN COMMIT? If yes, BEGIN should be before or after the
> event (in the rule/trigger)?

The rule/trigger runs in the same transaction as the original statement
(if you're not in an explicit transaction, you should get an implicit one
around the statement automatically)

Re: Transaction

From
Doug McNaught
Date:
"Mihai Gheorghiu" <tanethq@earthlink.net> writes:

> An event triggers a rule / trigger.
> Does this (event + rule/trigger) behave as a transaction, or is it necessary
> to wrap it into BEGIN COMMIT? If yes, BEGIN should be before or after the
> event (in the rule/trigger)?

It is always inside a transaction, since every SQL statement is a
transaction (unless of course you use BEGIN/COMMIT explicitly).  So
"event + trigger" will succeed or fail atomically.

-Doug
--
In a world of steel-eyed death, and men who are fighting to be warm,
Come in, she said, I'll give you shelter from the storm.    -Dylan

Re: Transaction

From
"Oliver Elphick"
Date:
"Mihai Gheorghiu" wrote:
  >An event triggers a rule / trigger.
  >Does this (event + rule/trigger) behave as a transaction, or is it necessary
  >to wrap it into BEGIN...COMMIT? If yes, BEGIN should be before or after the
  >event (in the rule/trigger)?

Any single command is a transaction including all its effects, unless it
is part of a larger transaction delimited by BEGIN COMMIT.  It doesn't
need its own BEGIN...COMMIT.

--
Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
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