Hi All!
I'm wondering if there is an elegant way to add simple behaviours to stored
Postgres functions.
1. First, what I want to get here is a function which orders their results
columns in ASC at one time and in DESC next time it is called. Something like
that:
CREATE FUNCTION sort_swap(integer) RETURNS SETOF atype AS '
sort_type ALIAS FOR $1;
row atype;
IF sort_type = 'ASC' THEN
FOR row IN SELECT column1 ASC, column2, column3 FROM table
ORDER BY column1 ASC, column2, column3
LOOP
RETURN NEXT row;
END LOOP;
ELSE
FOR row IN SELECT column1 ASC, column2, column3 FROM table
ORDER BY column1 DESC, column2, column3
LOOP
RETURN NEXT row;
END LOOP;
END IF;
RETURN;
' LANGUAGE plpgsql;
What I want here is a function without the sort_type parameter.
2. Second, is it possible to give a function a parameter which correspond to a
table name?
CREATE FUNCTION function_with_behaviours(integer) RETURNS SETOF atype AS '
table_name ALIAS FOR $1;
row atype;
SELECT INTO row * FROM table_name;
RETURN row;
' LANGUAGE plpgsql;
In that case, how to dynamically adapt atype to the be table_name%ROWTYPE ?
Thanks in advance
Youn
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