Thread: how to returns set of records in PL/python

Hi ,<br /><br />  Iam new to plpython,how can I return a  recordset from a plpython function?<br /><br />  Is there is
anyway give me an example;<br /><br />  <br />plpgsql function <br />--------------------------------<br /><br />CREATE
ORREPLACE FUNCTION function_to_get_all_countries() RETURNS SETOF RECORD AS $BODY$<br /> DECLARE    <br /><br />    r
RECORD;  <br />     <br />BEGIN<br /><br />    FOR r IN SELECT  pk_bint_country_id,vchr_country FROM tbl_country
LOOP<br/>        RETURN NEXT r;<br />        END LOOP;<br />    RETURN;<br /><br />END<br />$BODY$ LANGUAGE
'plpgsql';<br/><br /><br /><br /><br />How i can get the same result using plpythonu and how I can call the function
(isthere any user defined type required like in plpgsql)?<br /><br />Thanks in advance<br /><br />Anoop<br /> 

Anoop G wrote:

>Hi ,
>
>  Iam new to plpython,how can I return a  recordset from a plpython
>function?
>
>  Is there is any way give me an example;
>
>
>plpgsql function
>--------------------------------
>
>CREATE OR REPLACE FUNCTION function_to_get_all_countries() RETURNS SETOF
>RECORD AS $BODY$
>DECLARE
>
>    r RECORD;
>
>BEGIN
>
>    FOR r IN SELECT  pk_bint_country_id,vchr_country FROM tbl_country LOOP
>        RETURN NEXT r;
>        END LOOP;
>    RETURN;
>
>END
>$BODY$ LANGUAGE 'plpgsql';
>
>
>
>
>How i can get the same result using plpythonu and how I can call the
>function (is there any user defined type required like in plpgsql)?
>
>Thanks in advance
>
>Anoop
>
>  
>
Yes, plpython can return setofs. You may need to define a new type for that.
After that you can return a list, tuple, dictionary, set, generator 
object, or any

You may also check the plpython version, as i recall, its kind of *new* 
issue.

This works on 8.2.5, python 2.5,

For a simple case, something like that would work
regression=# \d countries          Table "public.countries"   Column    |       Type        | Modifiers
--------------+-------------------+-----------country_id   | integer           |country_name | character varying |


CREATE OR REPLACE FUNCTION get_countries()
returns setof countries
security definer
as
$$
return plpy.execute("select * from countries")

$$ language plpythonu;

Hope that helps.
Gerardo

Anoop G wrote:

>Hi ,
>
>  Iam new to plpython,how can I return a  recordset from a plpython
>function?
>
>  Is there is any way give me an example;
>
>
>plpgsql function
>--------------------------------
>
>CREATE OR REPLACE FUNCTION function_to_get_all_countries() RETURNS SETOF
>RECORD AS $BODY$
>DECLARE
>
>    r RECORD;
>
>BEGIN
>
>    FOR r IN SELECT  pk_bint_country_id,vchr_country FROM tbl_country LOOP
>        RETURN NEXT r;
>        END LOOP;
>    RETURN;
>
>END
>$BODY$ LANGUAGE 'plpgsql';
>
>
>
>
>How i can get the same result using plpythonu and how I can call the
>function (is there any user defined type required like in plpgsql)?
>
>Thanks in advance
>
>Anoop
>
>  
>
Forgot to mention that postgres home page has some info about plpython.
http://www.postgresql.org/docs/8.3/static/plpython-funcs.html

Cya.
Gerardo