I have the following table called 'second'
TABLE public.second
(
userid bigint,
companyid bigint
)
and table called visibility_matrix
CREATE TABLE public.visibility_matrix
(
name character varying,
companyid bigint
)
I created a trigger after I update the 'second' table I want to delete the row in visibility matrix ,I tried to achieve it via deleting the row with the companyid in visibility_matrix but it didn't work,any suggestions? here is the trigger:
CREATE OR REPLACE FUNCTION pos_org_rel_refresh()
RETURNS trigger AS
$$
DECLARE
r Integer ;
BEGIN
IF TG_OP='UPDATE' THEN
DELETE FROM visibility_matrix where companyid=NEW.companyid;
END IF;
END;
$$
LANGUAGE 'plpgsql';
CREATE TRIGGER test_trigger
AFTER UPDATE OR DELETE
ON second
FOR EACH ROW
EXECUTE PROCEDURE pos_org_rel_refresh();
you are missing a return statement, this should fix it:
CREATE OR REPLACE FUNCTION pos_org_rel_refresh() RETURNS trigger AS
$$
DECLARE
r Integer ;
BEGIN
IF TG_OP='UPDATE' THEN
DELETE FROM visibility_matrix where companyid=NEW.companyid;
RETURN NEW;
END IF;
RETURN NULL;
END;
$$
LANGUAGE 'plpgsql';
Related
I've problem with a trigger function in postgresql.
Here my simple code.
CREATE TABLE specie
(specie_id INT PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
nome_comune TEXT UNIQUE,
nome_scientifico TEXT UNIQUE);
CREATE TABLE rilevatore
(rilevatore_id INT PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
nome_cognome TEXT);
CREATE TABLE evento_investimento
(evento_id INT PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
data DATE,
ora TIME WITHOUT TIME ZONE,
rilevatore_id INT REFERENCES rilevatore (rilevatore_id),
specie_id INT REFERENCES specie(specie_id));
CREATE VIEW inserimento_dati_vista AS
SELECT row_number() OVER ()::integer AS gid,
evento_investimento.ora,
evento_investimento.data,
rilevatore.nome_cognome,
specie.nome_comune,
specie.nome_scientifico
FROM evento_investimento
JOIN specie ON evento_investimento.specie_id = specie.specie_id
JOIN rilevatore ON evento_investimento.rilevatore_id = rilevatore.rilevatore_id;
CREATE OR REPLACE FUNCTION inserimento_dati_fun_2() RETURNS trigger AS $$
BEGIN
if not exists(select * from rilevatore where rilevatore.nome_cognome=new.nome_cognome) then
INSERT INTO rilevatore (nome_cognome)
VALUES (NEW.nome_cognome);
end if;
if not exists(select * from specie where specie.nome_comune=new.nome_comune) then
INSERT INTO specie (nome_comune, nome_scientifico)
VALUES (NEW.nome_comune, NEW.nome_scientifico);
end if;
INSERT INTO evento_investimento (data, ora, rilevatore_id, specie_id)
VALUES (NEW.data,NEW.ora,
(SELECT rilevatore_id FROM rilevatore WHERE rilevatore.nome_cognome = NEW.nome_cognome),
(SELECT specie_id FROM specie WHERE specie.nome_comune = NEW.nome_comune));
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
create trigger inserimento_dati_fun_trg
instead of insert on inserimento_dati_vista for each row EXECUTE procedure inserimento_dati_fun_2();
Now, I want to add a function that allow to update all the tables by using the view inserimento_dati_vista.
I've tried with a simple code to update only the data column
CREATE OR REPLACE FUNCTION update_dati_fun_2() RETURNS TRIGGER AS $$
BEGIN
IF (TG_OP = 'UPDATE') THEN
IF old.data is distinct from new.data then
UPDATE evento_investimento
SET data = new.data;
END IF;
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
create trigger update_dati_fun_2_trg
instead of update on inserimento_dati_vista for each row EXECUTE procedure update_dati_fun_2();
However when I perfomr the query in order to update only a row, the trigger update all the rows in the table. Here some code to fill data.
INSERT INTO inserimento_dati_vista
(data, ora, nome_cognome, nome_comune, nome_scientifico)
VALUES
('2020-01-01', '16:54:00','mario', 'lupo', 'Canis lupus'),
('2020-01-02', '13:54:00','luca', 'lontra', 'Lutra lutra');
UPDATE inserimento_dati_vista
SET data = '2021-01-02' where nome_cognome = 'luca'
Update function is:
CREATE OR REPLACE FUNCTION update_dati_fun_2() RETURNS TRIGGER AS $$
BEGIN
IF (TG_OP = 'UPDATE') THEN
IF old.data is distinct from new.data then
UPDATE evento_investimento e
SET data = new.data
FROM rilevatore r
WHERE nome_cognome = new.nome_cognome AND r.rilevatore_id = e.rilevatore_id;
END IF;
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE FUNCTION create_child1()
RETURNS TABLE(sys_user_id integer,
sys_service_id integer
)
LANGUAGE 'plpgsql'
COST 100
VOLATILE
ROWS 1000
AS $BODY$
DECLARE
curr_id CURSOR IS
SELECT id FROM users WHERE id in (3089,3090,3091,3092);
v_id bigint;
BEGIN
OPEN curr_id;
LOOP
FETCH curr_id INTO v_id;
EXIT WHEN not found ;
EXECUTE format('
CREATE TABLE IF NOT EXISTS %I (
sys_user_id integer,
sys_service_id integer
id bigint NOT NULL primary key
)
INHERITS (telemetry_master)
WITH (
OIDS=FALSE
)', 'telemetry_' || v_id);
end loop;
close curr_id;
fetch next from curr_id into v_id;
END
$BODY$ LANGUAGE plpgsql;
You do not need an explicit cursor in your function. You can use a simple FOR ... IN ... LOOP.
It is unclear what you want to return from the function. For example, it can return a readable text about each created table.
CREATE OR REPLACE FUNCTION create_child1()
RETURNS SETOF text LANGUAGE plpgsql
AS $BODY$
DECLARE
v_id int;
BEGIN
FOR v_id IN 3089..3092 LOOP
EXECUTE format('
CREATE TABLE IF NOT EXISTS telemetry_%s (
sys_user_id integer,
sys_service_id integer,
id bigint NOT NULL primary key
)
INHERITS (telemetry_master)', v_id);
RETURN NEXT format('telemetry_%s created.', v_id);
END LOOP;
END $BODY$;
Use:
SELECT create_child1();
create_child1
-------------------------
telemetry_3089 created.
telemetry_3090 created.
telemetry_3091 created.
telemetry_3092 created.
(4 rows)
If the ids are not consecutive you can use unnest(), e.g.:
FOR v_id IN SELECT id FROM unnest(array[3000,3001,3020,3021]) AS id LOOP
I want to write trigger to update table when new row is insert. I am using updatea Query like
UPDATE table SET
geom = ST_SetSRID(ST_MakePoint(longitude, latitude), 4326)
You need to use a BEFORE trigger and then assign the new value:
CREATE OR REPLACE FUNCTION function_update()
RETURNS trigger AS
$BODY$
BEGIN
new.geom := ST_SetSRID(ST_MakePoint(new.longitude, new.latitude), 4326);
RETURN new;
END;
$BODY$
LANGUAGE plpgsql;
This can only be done in a BEFORE trigger:
CREATE TRIGGER triggerinsert
BEFORE INSERT
ON rdpr
FOR EACH ROW
EXECUTE PROCEDURE function_update();
I Solved by writing trigger function like
CREATE OR REPLACE FUNCTION function_update()
RETURNS trigger AS
$BODY$
BEGIN
new.geom := ST_SetSRID(ST_MakePoint(new.longitude, new.latitude), 4326);
RETURN new;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION function_update()
OWNER TO postgres;
and i wrote trigger to update
CREATE TRIGGER triggerinsert
Before INSERT
ON rdpr
FOR EACH ROW
EXECUTE PROCEDURE function_update();
I created a function which writes information about table deletions.
And another function which simply adds a trigger call after delete.
But I would like to store the whole row as string into my table.
According to Postgresql Documentation it should work by adding "OLD.*" into a text based column. But it fails telling me that I try to put too many columns into this table.
OLD is from type RECORD. And i want to have it in my text field like "value1,value2,value3" or it could be "colname:value,colname2:value". I dont care, I just want to see the row which has been deleted.
Another approach can be to log all delete queries from pg_stat_activity. But I don't know how to do that. Simply accessing pg_stat_activity every second would cause too much traffic I guess.
My table is simple:
create table delete_history (date timestamp, tablename varchar(100), data text);
This is my function:
CREATE or REPLACE FUNCTION ondelete() RETURNS TRIGGER AS $$
BEGIN
INSERT INTO delete_history VALUES (CURRENT_TIMESTAMP, TG_TABLE_NAME, OLD.*);
RETURN OLD;
END;
$$ LANGUAGE plpgsql;
This is my trigger:
CREATE OR REPLACE FUNCTION history_create_triggers() RETURNS void
AS $$
DECLARE
r RECORD;
BEGIN
FOR r IN SELECT table_name FROM information_schema.tables WHERE table_schema = 'public' AND table_type='BASE TABLE' LOOP
EXECUTE 'CREATE TRIGGER log_history AFTER DELETE ON public.' || r.table_name || ' FOR EACH ROW EXECUTE PROCEDURE ondelete();';
END LOOP;
END;
$$ LANGUAGE plpgsql;
You can convert type record into text:
CREATE or REPLACE FUNCTION ondelete() RETURNS TRIGGER AS $$
BEGIN
INSERT INTO delete_history VALUES (CURRENT_TIMESTAMP, TG_TABLE_NAME, OLD::text);
RETURN OLD;
END;
$$ LANGUAGE plpgsql;
sql fiddle demo
another approach could be converting your row into JSON with row_to_json function (if you have version 9.2):
CREATE or REPLACE FUNCTION ondelete() RETURNS TRIGGER AS $$
BEGIN
INSERT INTO delete_history VALUES (CURRENT_TIMESTAMP, TG_TABLE_NAME, row_to_json(OLD));
RETURN OLD;
END;
$$ LANGUAGE plpgsql;
sql fiddle demo
Another approach can be convert your data to hstore
CREATE or REPLACE FUNCTION ondelete() RETURNS TRIGGER AS $$
BEGIN
INSERT INTO delete_history VALUES (CURRENT_TIMESTAMP, TG_TABLE_NAME, hstore(OLD));
RETURN OLD;
END;
$$ LANGUAGE plpgsql;
I can't test it now - sqlfiddle is not allowing to use hstore.
CREATE TABLE users
(
id integer NOT NULL DEFAULT nextval('userseq'::regclass)
........
)
CREATE TABLE History
(
userid integer,
createdat timestamp with time zone
)
CREATE OR REPLACE FUNCTION recordcreatetime()
RETURNS trigger AS
$BODY$
BEGIN
NEW.createdAt = NOW();
RETURN NEW;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
User and History has one-one relationship. How i can insert new record in History table before creating new user.
CREATE OR REPLACE FUNCTION recordcreatetime()
RETURNS trigger
language plpgsql
AS $$
DECLARE
BEGIN
INSERT INTO History values(new.id,NOW() );
RETURN NEW;
END;
$$;
and write trigger statement as
CREATE TRIGGER user_hist
BEFORE INSERT ON users
FOR EACH ROW EXECUTE function recordcreatetime() ;