execute plpgsl like "normal" sql

Hi

Is there a possibility to execute pl/pgsql syntax like normal sql simmilar to sql+ from oracle?

The question is: if I want to execute soemthing like this:
--File foo.sql:
beginfor id in select id from mytable loop  update myothertable set payed = true where fk_id = id;end loop;
end;

Do I have to create a procedure or can I simply run the above statement via 
psql -D foo < foo.sql

Reason is, that I create pq/psql procedures (more complex than this example) at runtime in my client app and do not
wantto store the procedures permanent in my database schema. I would like to avoid create function / drop function
statements.

Thanks 
Chris
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