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pl/pgsql FOUND variables and RULES

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I have a volatile function (trigger) that gathers NEW.*, parses them, then inserts a subset of values into a different table.

The table is set up as an inherited table where the parent table has a RULE :

CREATE RULE myrule AS ON INSERT TO mytable WHERE ( myfield >= 100 and myfield < 200) DO INSTEAD INSERT INTO mytable_100 (field1,field2,field3,myfield) VALUES (NEW.field1,NEW.field2, NEW.field3, NEW.myfield);

Now when the trigger fires the insert does happen and ends up in mytable_100 but the FOUND variable is not set (since technically 0 rows got inserted into mytable). Is there a proper way to set up rules such that the FOUND variable is set within pl/pgsql upon a successful insert (via the rule) or how can I check for a successful insert?

Sven

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