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Event trigger procedures can be written in PL/Tcl.PostgreSQL requires that a procedure that is to be called as an event trigger must be declared as a function with no arguments and a return type ofevent_trigger.

The information from the trigger manager is passed to the procedure body in the following variables:

The return value of the trigger procedure is ignored.

Here's a little example event trigger procedure that simply raises aNOTICE message each time a supported command is executed:

CREATE OR REPLACE FUNCTION tclsnitch() RETURNS event_trigger AS $$  elog NOTICE "tclsnitch: $TG_event $TG_tag"$$ LANGUAGE pltcl;CREATE EVENT TRIGGER tcl_a_snitch ON ddl_command_start EXECUTE PROCEDURE tclsnitch();