Postgres: checking value before conditionally running an update or delete
I've got a fairly simple table which stores the records' authors in a text field as shown here:
CREATE TABLE "public"."test_tbl" (
"index" SERIAL,
"testdate" DATE,
"pfr_author" TEXT DEFAULT "current_user"(),
CONSTRAINT "test_tbl_pkey" PRIMARY KEY("index");
The user will never see the index or pfr_author fields, but I'd like them to be able to UPDATE the testdate fie开发者_高级运维ld or DELETE whole records if they have permission and if they are the author. i.e. if test_tbl.pfr_author = CURRENT_USER THEN permit the UPDATE OR DELETE, but if not then raise an error message such as "Sorry, you do not have permission to edit this record.".
I have not gone down the route of using a trigger as I figure that even if it is executed before row update the user-requested update will still take place afterwards regardless.
I've tried doing this through a rule, but end up with infinite recursion as I put an update command inside the rule. Is there some way to do this using rules alone or a combination of a rule and trigger?
Thanks very much for any help!
Use a row level BEFORE trigger on UPDATE and DELETE to do this. Just have it return NULL when the operation is not permitted and the operation will be skipped.
http://www.postgresql.org/docs/9.0/interactive/trigger-definition.html
the trigger function have some problem,resulting recursive loop update.You should do like this:
CREATE OR REPLACE FUNCTION "public"."test_tbl_trig_func" () RETURNS trigger AS $body$
BEGIN
IF not (old.pfr_author = "current_user"() OR "current_user"() = 'postgres') THEN
NULL;
END IF;
RETURN new;
END;
$body$ LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER COST 100;
I have a test like this,it does well;
UPDATE test_tbl SET testdate = CURRENT_DATE WHERE test_tbl."index" = 2;
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