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|
-- test plperl triggers
CREATE TABLE trigger_test (
i int,
v varchar
);
CREATE OR REPLACE FUNCTION valid_id() RETURNS trigger AS $$
if (($_TD->{new}{i}>=100) || ($_TD->{new}{i}<=0))
{
return "SKIP"; # Skip INSERT/UPDATE command
}
elsif ($_TD->{new}{v} ne "immortal")
{
$_TD->{new}{v} .= "(modified by trigger)";
return "MODIFY"; # Modify tuple and proceed INSERT/UPDATE command
}
else
{
return; # Proceed INSERT/UPDATE command
}
$$ LANGUAGE plperl;
CREATE TRIGGER "test_valid_id_trig" BEFORE INSERT OR UPDATE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE "valid_id"();
INSERT INTO trigger_test (i, v) VALUES (1,'first line');
INSERT INTO trigger_test (i, v) VALUES (2,'second line');
INSERT INTO trigger_test (i, v) VALUES (3,'third line');
INSERT INTO trigger_test (i, v) VALUES (4,'immortal');
INSERT INTO trigger_test (i, v) VALUES (101,'bad id');
SELECT * FROM trigger_test;
i | v
---+----------------------------------
1 | first line(modified by trigger)
2 | second line(modified by trigger)
3 | third line(modified by trigger)
4 | immortal
(4 rows)
UPDATE trigger_test SET i = 5 where i=3;
UPDATE trigger_test SET i = 100 where i=1;
SELECT * FROM trigger_test;
i | v
---+------------------------------------------------------
1 | first line(modified by trigger)
2 | second line(modified by trigger)
4 | immortal
5 | third line(modified by trigger)(modified by trigger)
(4 rows)
CREATE OR REPLACE FUNCTION immortal() RETURNS trigger AS $$
if ($_TD->{old}{v} eq $_TD->{args}[0])
{
return "SKIP"; # Skip DELETE command
}
else
{
return; # Proceed DELETE command
};
$$ LANGUAGE plperl;
CREATE TRIGGER "immortal_trig" BEFORE DELETE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE immortal('immortal');
DELETE FROM trigger_test;
SELECT * FROM trigger_test;
i | v
---+----------
4 | immortal
(1 row)
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