Re: Is there a way to be notified on the CREATE TABLE execution?

[Melvin Davidson <melvin6925@xxxxxxxxx>]

>Is there a way to be notified on the CREATE TABLE execution?

Here is sample code that will notify for a CREATE or DROP table:

CREATE TABLE public.tbl_create_log
(
  tbl_cl_key bigint NOT NULL DEFAULT nextval('tbl_create_log_tbl_cl_key_seq'::regclass),
  tbl_cre8_time timestamp without time zone DEFAULT now(),
  log_table_schema name,
  log_table_name name,
  log_session_user name,
  CONSTRAINT tbl_create_log_pk PRIMARY KEY (tbl_cl_key)
)
WITH (
  OIDS=FALSE
);
ALTER TABLE public.tbl_create_log
  OWNER TO postgres;
GRANT ALL ON TABLE public.tbl_create_log TO postgres;

CREATE OR REPLACE FUNCTION public.fn_notify_ddl()
  RETURNS event_trigger AS
$BODY$
DECLARE
    obj record;
BEGIN
/*
    RAISE INFO 'Type: %', TG_TAG;
    RAISE INFO 'Command: %', current_query();
    RAISE INFO 'DB Name: %', current_database();
    RAISE INFO 'DB User: %', session_user;
    RAISE INFO 'DB Port: %', inet_server_port();
    RAISE INFO 'Server Host: %', inet_server_addr();
    RAISE INFO 'Client Host: %', inet_client_addr();
*/
    FOR obj IN SELECT *
                 FROM pg_event_trigger_ddl_commands() LOOP
    IF obj.command_tag = 'CREATE TABLE'
    OR obj.command_tag = 'DROP TABLE'THEN
--          RAISE INFO 'we got a % event for object "%"', obj.command_tag, obj.object_identity;
          INSERT INTO tbl_create_log
          ( log_table_schema,
            log_table_name,
            log_session_user
          )
          SELECT n.nspname,
                 c.relname,
                 session_user
            FROM pg_class c
            JOIN pg_namespace n ON n.oid = c.relnamespace
           WHERE c.oid = obj.objid
             AND c.relkind = 'r';
        END IF;
    END LOOP;
END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION public.fn_notify_ddl()
  OWNER TO postgres;   

CREATE EVENT TRIGGER table_created_dropped ON DDL_COMMAND_END
    EXECUTE PROCEDURE public.fn_notify_ddl();

ALTER EVENT TRIGGER table_created_dropped
    OWNER TO postgres;

--

Melvin Davidson
Maj. Database & Exploration Specialist
Universe Exploration Command – UXC
Employment by invitation only!