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9.0

Example of trigger update with parameter

Asked by R7AF in PostgreSQL Database

Tags: trigger, postgresql

Can somebody give me a simple example of a trigger function that uses a parameter in Postgresql. In a table I have a column 'updated'. When a record is updated, the updated-value for that row should automatically get a new timestamp. For some reason the code below doesn't work. I guess because of the parameter.

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             CREATE TABLE testtable
(
  id serial NOT NULL,
  label text,
  created timestamp with time zone NOT NULL DEFAULT now(),
  updated timestamp with time zone NOT NULL DEFAULT now(),
  deleted boolean,
  description text,
  CONSTRAINT test1_pkey PRIMARY KEY (id)
)
WITH (OIDS=FALSE);
ALTER TABLE test OWNER TO postgres;
 
CREATE FUNCTION test_update() RETURNS trigger AS $$
begin
	update testtable set updated = now() where id=TG_ARGV[0];
end
$$ LANGUAGE plpgsql;
 
CREATE TRIGGER test_update_trigger
AFTER UPDATE
ON testtable
FOR EACH ROW
EXECUTE PROCEDURE test_update(id);

           
         

Attachments:

pgadmin3-error.png (5 KB) (File Type Details)

The error message when updating a record

20091028-EE-VQP-88 - Hierarchy / EE_QW_3_20080625

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25. k_murli_... 2,039

1. earthman2 532,136
2. gheist 190,329
3. ivanovn 135,696
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5. cminear 53,214
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Example of trigger update with parameter

Asked by R7AF in PostgreSQL Database

Tags: trigger, postgresql

About this solution