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How to send multiple parameters to a pl/pgsql function

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I need to create a pl/pgsql function witch accept a list of parameters and evaluate them.
I've tried this
 
CREATE OR REPLACE FUNCTION get_first_valid (lista_elementi VARCHAR[]) 
        RETURNS VARCHAR AS $$
DECLARE
    the_one    VARCHAR;   
BEGIN
 
    IF (ARRAY_UPPER(lista_elementi, 1) IS NOT NULL) THEN
        FOR i IN 1..ARRAY_UPPER(lista_elementi, 1) LOOP
            the_one := lista_elementi[i];
            IF ((the_one IS NOT NULL) AND (TRIM(the_one) != '') ) THEN       
                EXIT;
            END IF;
        END LOOP;
    ELSE
        the_one := NULL;
    END IF;         
   
    RETURN (the_one);
END;
$$ LANGUAGE 'plpgsql' VOLATILE;
 
I know that postgresql array implementation is not right complete and that if just
one element of array is NULL the basics array function (array_dims, array_upper, etc.) returns NULL.
I need to send a list of parameters (which could contain NULL values) and evaluate the parameters excluding NULL values
is this possible?
any suggestion?
 
 

Sgarbossa Domenico

Extacy Project Leader


 

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