Hi I have a Registra_cambios () function; which want to assign to all tables in my database, I wonder if you can concatenate the trigger name with the record (table name) my cursor to not have the same trigger name on all tables
create trigger example t_log_ "record" ()
CREATE OR REPLACE FUNCTION ActiveTriggers() returns void as $$
DECLARE
r record;
c CURSOR FOR SELECT table_name as tab FROM information_schema.tables WHERE table_schema='public' AND table_type='BASE TABLE';
BEGIN
FOR r IN c LOOP
create trigger t_log_r before insert or update or delete
on r.tab
for each row
execute procedure Registra_cambios();
END LOOP;
END;
$$ LANGUAGE plpgsql;
soemthing like?..
do
$$
declare
r record;
begin
for r in (SELECT table_name as tab FROM information_schema.tables WHERE table_schema='public' AND table_type='BASE TABLE';) loop
execute 'create trigger t_log_r_'||r.tab||' before insert or update or delete
on '||r.tab||'
for each row
execute procedure Registra_cambios()';
end loop;
end;
$$
;
Related
In postgres not real create trigger on pg_stat_activity, becouse i create my view based on pg_stat_activity and create trigger.
DROP FUNCTION IF EXISTS get_sa() CASCADE;
DROP FUNCTION IF EXISTS f_call_count_conn();
DROP FUNCTION IF EXISTS f_update_count_conn();
CREATE OR REPLACE FUNCTION get_sa() RETURNS SETOF pg_stat_activity AS
$$ SELECT * FROM pg_catalog.pg_stat_activity; $$
LANGUAGE sql
VOLATILE
SECURITY DEFINER;
CREATE OR REPLACE VIEW pg_stat_activity_allusers AS SELECT * FROM get_sa();
GRANT SELECT ON pg_stat_activity_allusers TO public;
CREATE OR REPLACE FUNCTION f_call_count_conn()
RETURNS TRIGGER AS
$BODY$
BEGIN
IF TG_OP = 'INSERT' THEN
COPY (SELECT time_change, count FROM count_conn) TO '/tmp/query.csv' (format csv, delimiter ';');
RETURN NEW;
ELSIF TG_OP = 'DELETE' THEN
COPY (SELECT time_change, count FROM count_conn) TO '/tmp/query.csv' (format csv, delimiter ';');
RETURN OLD;
END IF;
-- PERFORM f_update_count_conn();
-- RETURN NEW;
END;
$BODY$
LANGUAGE plpgsql;
CREATE TRIGGER t_check_activity_conn
INSTEAD OF INSERT OR DELETE ON pg_stat_activity_allusers
FOR EACH ROW
EXECUTE PROCEDURE f_call_count_conn();
CREATE FUNCTION f_update_count_conn()
RETURNS VOID
AS
$BODY$
BEGIN
insert into count_conn (time_change, count)
values (NOW(), (select count(*)
from pg_stat_activity_allusers));
END;
$BODY$
LANGUAGE plpgsql VOLATILE;
This code is not working, but when i replace my view (pg_stat_activity_allusers) on real table and change this table, my trigger work. Why? Thank you!
Your code worked for me on Postgres 9.5, except I manually called f_update_count_conn() to populate count_conn, because you're not (or no longer) calling it anywhere.
# select f_update_count_conn();
f_update_count_conn
---------------------
(1 row)
mw=# select * from count_conn;
time_change | count
----------------------------+-------
2017-02-03 17:22:34.846179 | 1
(1 row)
mw=# insert into pg_stat_activity_allusers(datid) values(123456::oid);
INSERT 0 1
mw=#
[1]+ Stopped '/Applications/Postgres.app/Contents/Versions/9.5/bin'/psql -p5432
$ cat /tmp/query.csv
2017-02-03 17:22:34.846179;1
I'm new to plpgsql. I'm sure there is some really simple way to do this, but for some reason I'm having a lot of trouble trying to figure out how to do this.
I'm simply trying to loop through the list of existing tables and execute
CREATE TABLE z_existing_table_name AS SELECT * FROM existing_table_name WITH DATA
So far, I have this:
CREATE OR REPLACE FUNCTION create_backup_row()
RETURNS RECORD
AS $$
DECLARE
row RECORD;
BEGIN
FOR row IN SELECT * FROM information_schema.tables WHERE table_catalog = 'my_db' and table_schema = 'public'
LOOP
EXECUTE 'CREATE TABLE z_' || t.table_name || ' as ' || t.table_name
END LOOP;
END;
$$ LANGUAGE plpgsql;
It would be an added bonus if I can make this function re-runnable. Something like drop table if exist then create table ...
#Steven, use below procedure,
-- Function: create_backup_row()
-- DROP FUNCTION create_backup_row();
CREATE OR REPLACE FUNCTION create_backup_row()
RETURNS integer AS
$BODY$
DECLARE
v_table text;
BEGIN
FOR v_table IN
SELECT table_name
FROM information_schema.tables
WHERE table_catalog = 'my_db'
AND table_schema = 'public'
AND table_name not ilike '%z_%' -- to skip the table with z_ when we rerun it.
LOOP
EXECUTE ' DROP TABLE IF EXISTS z_' || v_table ;
EXECUTE 'CREATE TABLE z_' || v_table || ' as SELECT * FROM ' || v_table ;
END LOOP;
return 1;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION create_backup_row()
OWNER TO postgres;
I have a question: how to add multiple table for one trigger?
Is that possible, or should I just make another 2 triggers for 2 different tables?
Create a new function
CREATE OR REPLACE FUNCTION updated_timestamp_func()
RETURNS TRIGGER
LANGUAGE plpgsql AS
'
BEGIN
NEW.updated_at = now();
RETURN NEW;
END;
';
Then create a trigger for each table that has the column updated_at
DO $$
DECLARE
t text;
BEGIN
FOR t IN
SELECT table_name FROM information_schema.columns WHERE column_name = 'updated_at'
LOOP
EXECUTE format('CREATE TRIGGER trigger_update_timestamp
BEFORE UPDATE ON %I
FOR EACH ROW EXECUTE PROCEDURE updated_timestamp_func()', t,t);
END loop;
END;
$$ language 'plpgsql';
Iterate one trigger for all tables
(For Example Foreign Tables)
DO
$$
DECLARE
r RECORD;
BEGIN
FOR r IN SELECT *
FROM information_schema.tables
where table_type = 'FOREIGN TABLE'
and table_schema = 'public'
and table_name <> 'django_migrations'
LOOP
RAISE NOTICE 'CREATE TRIGGER FOR: %', r.table_name::text;
EXECUTE 'CREATE TRIGGER trg_insert_ids
BEFORE INSERT
on ' || r.table_name || ' FOR EACH ROW
EXECUTE PROCEDURE insert_ids();';
END LOOP;
END;
$$ LANGUAGE plpgsql;
You need to define a trigger for each table, so if you have two tables, you need two triggers.
However, multiple triggers can use the same trigger function.
for some reason I just can not figure this out. I have a seperate schema in PostgreSQL for notification related tables for each user connected to the server. My plan is to have each user create a TEMP table to receive extra notification info from since Xojo doesn't support PostgreSQL payloads.
I feel like I'm starting to get close so I'll just post my code that is in my trigger function.
DECLARE
my_table RECORD;
BEGIN
FOR my_table IN
SELECT table_name
FROM information_schema.tables
WHERE table_schema = 'information_schema'
LOOP
INSERT INTO my_table.table_name (effected_row_id)
VALUES (NEW.effected_row_id);
END LOOP;
END;
Tell me if I'm wrong, but I believe my main problem is figuring out how to use the table name returned from the SELECT statement in the INSERT statement.
EDIT:
This is my current trigger function
-- Function: notification.my_insert_trigger_function()
-- DROP FUNCTION notification.my_insert_trigger_function();
CREATE OR REPLACE FUNCTION notification.my_insert_trigger_function()
RETURNS trigger AS
$BODY$DECLARE
my_table RECORD;
BEGIN
FOR my_table IN
SELECT table_name
FROM information_schema.tables
WHERE table_schema = 'notification' AND table_name <> 'notification_global' AND table_name <> 'switcher'
LOOP
EXECUTE(FORMAT($f$
INSERT INTO %s (effected_row_username)
VALUES (%s);
$f$, 'notification.' || my_table.table_name, NEW.effected_row_username));
END LOOP;
RETURN new;
END;$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION notification.my_insert_trigger_function()
OWNER TO serveradmin;
You need to use dynamic commands in your trigger function.
The funcion format() is often very helpful.
DECLARE
my_table RECORD;
BEGIN
FOR my_table IN
SELECT table_name
FROM information_schema.tables
WHERE table_schema = 'information_schema'
LOOP
EXECUTE(FORMAT($f$
INSERT INTO %s (effected_row_id)
VALUES (%s);
$f$, my_table.tablename, NEW.effected_row_id));
END LOOP;
END;
I have a plpgslq function which does some data processing and would like to write a for loop, however my table name is not known at design time. Is there any possible way to achieve this? Here is sample code snippet of what I want to achieve:
-- Function: check_data()
-- DROP FUNCTION check_data();
CREATE OR REPLACE FUNCTION check_data()
RETURNS character varying AS
$BODY$declare
dyn_rec record;
tbl_name record;
begin
-- sample dynamic tables
tbl_name := 'cars';
tbl_name := 'trucks';
tbl_name := 'bicycles';
for dyn_rec in select * from format($$s%$$,tbl_name) loop
raise notice 'item is %',dyn_rec.item_no;
end loop;
return 'Processing Ok';
end;$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION check_data()
OWNER TO postgres;
You cannot use a variable as table or column identifier in plpgsql embedded SQL ever. A solution is dynamic SQL - EXECUTE or FOR IN EXECUTE statements:
DO $$
DECLARE
tables text[] = ARRAY['table1','table2'];
table_name text;
rec record;
BEGIN
FOREACH table_name IN ARRAY tables
LOOP
FOR r IN EXECUTE format('SELECT * FROM %I', table_name)
LOOP
RAISE NOTICE '%', rec;
END LOOP;
END LOOP;
END; $$