Thread: trigger, how to determine action calling?
Hi, Is it possible to determine easily which action called triger? For example: CREATE TRIGGER log_znw BEFORE INSERT OR UPDATE ON tab FOR EACH ROW EXECUTE PROCEDURE log_tab(); How to check in called function if it was INSERT or UPDATE? tia Marcin Mazurek -- Kierownik Działu Systemowego MULTINET SA o/Poznan http://www.multinet.pl/
Hello Marcin, Once, Thursday, August 31, 2000, 2:22:10 PM, you wrote: MM> Hi, MM> Is it possible to determine easily which action called triger? MM> For example: MM> CREATE TRIGGER log_znw BEFORE INSERT OR UPDATE ON tab MM> FOR EACH ROW EXECUTE PROCEDURE log_tab(); MM> How to check in called function if it was INSERT or UPDATE? If you use plpgsql language for your procedure, then TG_OP variable is what you need, if pltcl, then $TG_op variable. -- Best regards, Yury ICQ 11831432 mailto:yura@vpcit.ru
Marcin Mazurek wrote: > > Hi, > Is it possible to determine easily which action called triger? > For example: > CREATE TRIGGER log_znw BEFORE INSERT OR UPDATE ON tab > FOR EACH ROW EXECUTE PROCEDURE log_tab(); > How to check in called function if it was INSERT or UPDATE? Sure. Here's a snippet of C that does this. You might like to check out the sample SPI programs included with the PostgreSQL source (in /contrib/spi.) if (!CurrentTriggerData) elog(ERROR, "nodeinsert: triggers are not initialized"); if (TRIGGER_FIRED_FOR_STATEMENT(CurrentTriggerData->tg_event)) elog(ERROR, "nodeinsert: can't process STATEMENT events"); if (TRIGGER_FIRED_AFTER(CurrentTriggerData->tg_event)) elog(ERROR, "nodeinsert: must be fired before event"); if (TRIGGER_FIRED_BY_INSERT(CurrentTriggerData->tg_event)) trigger_tuple = CurrentTriggerData->tg_trigtuple; else if (TRIGGER_FIRED_BY_UPDATE(CurrentTriggerData->tg_event)) /* trigger_tuple = CurrentTriggerData->tg_newtuple; */ elog(ERROR, "nodeinsert: must be fired on INSERT, not UPDATE"); else elog(ERROR, "nodeinsert: must be fired on INSERT, not DELETE"); -- Ron Peterson Systems Manager Wallace Floyd Design Group 273 Summer Street Boston, MA 02210 617.350.7400 tel 617.350.0051 fax rpeterson@wallacefloyd.com