I have two tables A and B. A has the following columns :
a_name, a_num, a_addr. B also has these columns.
Whenever I insert a record in A, I want that record to be inserted in B as well by the use of a trigger.
CREATE OR REPLACE FUNCTION trigger()
RETURNS trigger AS
$BODY$
begin
if tg_op='INSERT' then
insert into b values (new.a_name ,new.a_num ,new.a_addr);
return new;
end if;
return null;
end;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
---------------------------
CREATE TRIGGER trigger_a
AFTER INSERT OR UPDATE
ON a
FOR EACH ROW
EXECUTE PROCEDURE trigger();
Related
Please Find below Table structure:-
CREATE TABLE emp (
empname text NOT NULL,
salary integer,
salary1 integer
);
Whenever i will insert data into emp table using below query salary1 column should be filled automatically using trigger in postgres ?
insert into emp(empname,salary) values('Tarik','1200');
I have tried below code,But it is not working for me.
CREATE OR REPLACE FUNCTION employee_insert_trigger_fnc()
RETURNS trigger AS
$$
BEGIN
update emp set salary1=NEW.salary where NEW.salary=NEW.salary;
RETURN NEW;
END;
$$
LANGUAGE 'plpgsql';
create TRIGGER employee_insert_trigger
AFTER Insert
ON emp
FOR EACH ROW
EXECUTE PROCEDURE employee_insert_trigger_fnc();
Please help..
Thanks in advance.
Issue resolved after my R&D:-
CREATE OR REPLACE FUNCTION employee_insert_trigger_fnc()
RETURNS trigger AS
$$
BEGIN
NEW.salary1 := NEW.salary;
RETURN NEW;
END;
$$
LANGUAGE 'plpgsql';
create TRIGGER employee_insert_trigger
BEFORE INSERT OR UPDATE
ON ami_master.emp
FOR EACH ROW
EXECUTE PROCEDURE employee_insert_trigger_fnc();
I'm trying to delete a record from the table 'student', where on a Cascade delete it will remove it from the 'entry' table. But before delete i need to store this record in the third table 'cancel'.
Here is what i worked out so far:
DELETE FROM "CMPS".student
WHERE sno = '1';
CREATE TRIGGER canceled BEFORE DELETE
ON entry
FOR EACH ROW
EXECUTE PROCEDURE trigger_backup_row
CREATE OR REPLACE FUNCTION trigger_backup_row(integer)
RETURNS trigger AS
$$
BEGIN
INSERT INTO cancel (eno, excode, sno) values (NEW.eno, NEW.excode, NEW.sno);
RETURN NEW;
END;
$$
language PLPGSQL
But comes back with an errors. Any help will be much appreciated.
I suppose you need:
CREATE OR REPLACE FUNCTION trigger_backup_row()
RETURNS trigger AS
$$
BEGIN
INSERT INTO cancel (eno, excode, sno) values (OLD.eno, OLD.excode, OLD.sno);
RETURN OLD;
END;
$$
language PLPGSQL
;
CREATE TRIGGER canceled BEFORE DELETE
ON entry
FOR EACH ROW
EXECUTE PROCEDURE trigger_backup_row()
;
trigger function do not use arguments
on delete yo udon't have any NEW row - just an OLD one
So basically I'm trying to create a trigger that will update another table if an insert or update is located less than 1 meter of distance of an existing one.
It does not allow me to insert anything because the FROM clause is missing on the if statement and I'm not sure how to call it properly.
I got the following
CREATE TRIGGER access_node_aiu
AFTER INSERT OR UPDATE
ON schemab.table
FOR EACH ROW
EXECUTE PROCEDURE schemab.trigegr();
CREATE OR REPLACE FUNCTION schemab.trigger()
RETURNS trigger AS
$BODY$
BEGIN
if st_distance(new.geom, a.geom) < 1 then
INSERT INTO schemab.overlap
SELECT nextval('schemab.overlap_id_seq'::regclass), a.node_id, new.node_id, a.date, now(), st_distance(a.geom, new.geom), new.geom
FROM schemab.table a;
end if;
RETURN new;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
How to do this in postgresql?
Change IF into WHERE
CREATE OR REPLACE FUNCTION schemab.trigger()
RETURNS trigger AS
$BODY$
BEGIN
INSERT INTO schemab.overlap
SELECT nextval('schemab.overlap_id_seq'::regclass), a.node_id, new.node_id, a.date, now(), st_distance(a.geom, new.geom), new.geom
FROM schemab.table a
WHERE st_distance(new.geom, a.geom) < 1;
RETURN new;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
When a row is inserted or updated in a specific table (in this example it's the table called 'fpl'). How can I include the affected table and schema in the notification?
SQL as follows:
CREATE TRIGGER fpl_event
AFTER INSERT OR UPDATE ON fpl
FOR EACH ROW
EXECUTE PROCEDURE fpl_notify();
CREATE OR REPLACE FUNCTION fpl_notify()
RETURNS trigger AS $$
BEGIN
NOTIFY dbNotification, 'something got insereted in fpl!';
RETURN NULL;
END;
$$ LANGUAGE PLPGSQL;
Update:
CREATE OR REPLACE FUNCTION fpl_notify() RETURNS trigger
AS
$$
BEGIN
EXECUTE format('notify dbNotification, ''%s''', TG_TABLE_SCHEMA);
RETURN NULL;
END;
$$ LANGUAGE PLPGSQL;
read trigger special variables
I'm working on my first ever Trigger. When I'm doing an INSERT on table I want to conditionaly remove rows from other table.
Here is a trigger:
CREATE OR REPLACE FUNCTION clear_seen_by()
RETURNS trigger AS
$BODY$
BEGIN
IF (OLD.popup = '1') THEN
DELETE FROM news_seen_by;
END IF;
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
Invoked by:
CREATE TRIGGER clear_seen_by
AFTER INSERT
ON news
FOR EACH STATEMENT
EXECUTE PROCEDURE clear_seen_by();
As an error I see that NEW or OLD (if I motify the trigger) is not declared/unknown. Where is the problem?
In an INSERT statement you do not have an OLD record defined.
You should use NEW.popup instead, and also declare the trigger to be FOR EACH ROW.
CREATE OR REPLACE FUNCTION clear_seen_by() RETURNS trigger AS
$BODY$
BEGIN
IF (NEW.popup = '1') THEN
DELETE FROM news_seen_by;
END IF;
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql VOLATILE COST 100;
CREATE TRIGGER
clear_seen_by
AFTER INSERT ON
news
FOR EACH ROW EXECUTE PROCEDURE
clear_seen_by();
You declare a trigger FOR EACH STATEMENT. Maybe you need FOR EACH ROW?
FOR EACH STATEMENT triggers do not have NEW and OLD.