Passing a record as function argument PL/pgSQL

Question

First I am really new to pl/pgsql. Need it for a project.

I am stuck with this (simplified) problem.

My db schema has a n to m relationship (author, books, a

Answer 1

Passing JSON datatype (Postgresql 9.2 or higher):

CREATE OR REPLACE FUNCTION f_insert_book(_book json, _authors json)
   RETURNS void AS 
$$
BEGIN
-- insert book into table books
Insert into books values select * from json_populate_recordset(null:book, _book);
    -- for each author add an entry to author_books table
Insert into authors values select * from json_populate_recordset(null:authors, _authors);
end;
$$ language plpgsql;