PL/pgSQL

Hi, there,
1.
Is anybody know how to declare a explicit cursor in PL/SQL in postgres?
1. I want create a function use PL/pgSQL:
create function foo() returns whatevertype as '
declare v_asda int2; cursor is select a,b,c from AAA;   -- what is the syntex?
begin statements
end;
' langauge 'plpgsql';
2. for the record type, can I explicitly define my own record like:
declare  type blah is record(ename text,job text,id int 4);  type blahblah is table of blah index by int4;
--like in
 
Oracle
......

3. how to define an array in PL/pgSQL declare block and assign it in
execuable block?
like:
declare   ary int[5];        --  in PL/pgSQL  maybe is _int;
began   ary[1]:= 3;        -- give me error when I run it;
end;

Thanks.

--
Jie LIANG

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