Thread: Transactions in rules..
Can i use transactions in rules?? I was trying something like: create rule x_test as on insert to view1 do instead ( begin; insert into test1 values (new.a,new.b); insert into test2 values (new.c,new.d); commit; ); But when i give this command in psql i always get an error.. Regards fabrizio@macrongolf.com http://macrongolf.com http://eteampoint.com http://macron.com
Fabrizio Mazzoni wrote: > Can i use transactions in rules?? > I was trying something like: > > create rule x_test as > on insert to view1 > do instead > ( > begin; > insert into test1 values (new.a,new.b); > insert into test2 values (new.c,new.d); > commit; > ); > > But when i give this command in psql i always get an error.. There is no way to execute a statement without having a transaction in PostgreSQL. If you're not inside of a transaction block, even a simple SELECT from the client (psql, application) will have it's own transaction. For your above case, if you don't do BEGIN/COMMIT, the INSERT will have it's own Xact with automatic COMMIT (if no ERROR happens). The rule actions will allways belong to the same Xact the INSERT does, so either all is committed or nothing. Jan -- #======================================================================# # It's easier to get forgiveness for being wrong than for being right. # # Let's break this rule - forgive me. # #================================================== JanWieck@Yahoo.com # _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com
Cannot do this, as currently there is no support for nested transactions. On Mon, 9 Jul 2001, Fabrizio Mazzoni wrote: > Can i use transactions in rules?? > I was trying something like: > > create rule x_test as > on insert to view1 > do instead > ( > begin; > insert into test1 values (new.a,new.b); > insert into test2 values (new.c,new.d); > commit; > ); > > But when i give this command in psql i always get an error.. > > Regards > > fabrizio@macrongolf.com > http://macrongolf.com > http://eteampoint.com > http://macron.com > > > ---------------------------(end of broadcast)--------------------------- > TIP 3: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to majordomo@postgresql.org so that your > message can get through to the mailing list cleanly > >
Fabrizio Mazzoni writes: > Can i use transactions in rules?? > I was trying something like: > > create rule x_test as > on insert to view1 > do instead > ( > begin; > insert into test1 values (new.a,new.b); > insert into test2 values (new.c,new.d); > commit; > ); The statements added by the rule will automatically be executed in the same one transaction as the original statement that fired the rule. Your syntax example would sort of invoke a nested transaction, which doesn't exist. All in all, you don't need to worry about it. -- Peter Eisentraut peter_e@gmx.net http://funkturm.homeip.net/~peter