cursor return null - Mailing list pgsql-general

From Ramesh T
Subject cursor return null
Date
Msg-id CAK8Zd=v+H6m0p39H8YS5ePXnPwHY-VPwMiz3fSKz4LPCoOfinA@mail.gmail.com
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Responses Re: cursor return null  (David G Johnston <david.g.johnston@gmail.com>)
List pgsql-general
Hello,
           in postgres function (id bigint ),the following code not return any value with artNums ,But when i do  select statement ony it's output the values with out include cursor 

 i.e,cursor problem ..?

please let me know what should i do to getvalues from cursor, but i dont where i missing 

 function (id bigint )

DECLARE
      PartNums   varchar (10000);
 artNums CURSOR for
      SELECT p.PART_NUM part_num
        FROM lineitem sol, part p
       WHERE sol.ORDER_ID = id AND p.PART_ID = sol.PART_ID;
   
   BEGIN
      FOR cPart IN  artNums LOOP
  BEGIN
        PartNums := PartNums || cPart.part_num || ', ';
END;

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