Answer by a_horse_with_no_name for Use array of composite type as function parameter and access it

To create an array of a type, use an explicit array constructor:

array[(1,100,'Arthur',1), (1,50,'Zaphod',1)]::books[]

So to call your function you would need to use:

select update_table(array[(1,100,'Arthur',1), (1,50,'Zaphod',1)]::books[])

But your function has an error: after the loop you are missing a return statement, because the one in the exception block is only executed if an exception occurs.

So you need something like this:

begin   ....   STATUS:='Saved';  return status;  ---<<< this is missing  exception when others then    STATUS:='failure';    RETURN STATUS; --<<< this is only execute if an exception occursEND;

Alternatively you need another begin .. end; block:

begin   begin        for ...     end loop;    STATUS:='Saved';  exception when others then    STATUS:='failure';  end;  RETURN STATUS; END;

Unrelated, but: you don't need the loop to iterate over the array. You can do that more efficiently using a single statement:

INSERT INTO books_table    (Book_ID, Row_Num, Book_OWNER, Book_OWNER_ID)select *from unnest(row_book);