Behaviour of sql language function
Hi all I noticed the following beaviour, if a command in a sql function
fails the other statements fail like if the entire function where
surrounded by a begin-commit block. While I find this behaviour nice, as
far as I could find, this behaviour is not documented[1]http://www.postgresql.org/docs/9.1/static/sql-createfunction.html. I wished to
create a function that depends on such way of working but I cannot trust
that sql functions will continue to work that way on the next postgresql
versions.
So, is it documented somewhere?
I'm linking to a pastebin file that exemplifies the behaviour.
[1]: http://www.postgresql.org/docs/9.1/static/sql-createfunction.html
[2]: http://pastebin.com/LWfFgH7L -- Marcelo Lacerda
--
Marcelo Lacerda
Marcelo Sena <marceloslacerda@gmail.com> wrote:
So, is it documented somewhere?
http://www.postgresql.org/docs/current/static/tutorial-transactions.html
| PostgreSQL actually treats every SQL statement as being executed
| within a transaction. If you do not issue a BEGIN command, then
| each individual statement has an implicit BEGIN and (if
| successful) COMMIT wrapped around it.
Combine this with the fact that a function can only run in the
context of a command, like:
SELECT func_name();
You have your guarantee -- as long as you understand the possible
action of subtransactions (like savepoints).
-Kevin
Oh, nice, I haven't noticed that fact. Thanks!
--
Marcelo Lacerda
On Thu, Apr 26, 2012 at 5:53 PM, Kevin Grittner <Kevin.Grittner@wicourts.gov
Show quoted text
wrote:
Marcelo Sena <marceloslacerda@gmail.com> wrote:
So, is it documented somewhere?
http://www.postgresql.org/docs/current/static/tutorial-transactions.html
| PostgreSQL actually treats every SQL statement as being executed
| within a transaction. If you do not issue a BEGIN command, then
| each individual statement has an implicit BEGIN and (if
| successful) COMMIT wrapped around it.Combine this with the fact that a function can only run in the
context of a command, like:SELECT func_name();
You have your guarantee -- as long as you understand the possible
action of subtransactions (like savepoints).-Kevin