How to access the procedure that return setof refcursor from PostgreSQL in Java?

Question

Need to access a procedure that return setof refcursor from PostgreSQL.

I am able to access the first object but not rest of object not rest of objects.

    con.setAutoCommit(false);
    try (CallableStatement proc = 
             con.prepareCall("{ ? = call usp_sel_article_initialdata_new1() }")) {
        proc.registerOutParameter(1, Types.OTHER);
        proc.execute();
        ResultSet results = (ResultSet) proc.getObject(1); 
        while (results.next()) {
            System.out.println("Result Id" + results.getString(1));
            System.out.println("Results Name" + results.getString(2));
    }

This give me the first refcursor values but when i try to use second refcursor it give me error I use this line:

proc.registerOutParameter(2, Types.OTHER);

It is giving errors . Also tried:

proc.registerOutParameter(1, Types.REF);

This also not work. Procedure Example is:

    CREATE OR REPLACE FUNCTION usp_sel_article_initialdata_new1()
    RETURNS SETOF refcursor AS
    $BODY$
    Declare swv_refcur refcursor;
    swv_refcur2 refcursor;
    DECLARE r record;
    BEGIN

    open SWV_RefCur for Select OM.opID as ID,OM.OperatorName as Name from operator
    AS OM (OPid bigint,OperatorName character varying(100),status boolean)
    where OM.status = true 
    order By OperatorName;
    return next SWV_RefCur;

    open SWV_RefCur2 for Select CC.cirid as ID,CC.cirnm as Name from  circle 
    AS CC (cirid bigint,cirnm character varying(100),status boolean)
    where Status = true and cirid not in(28,31) 
    order by cirnm;
    return next SWV_RefCur2;

Please help me how to access second object.

Answer 1

returns setof refcursor means you get a regular ResultSet where each "row" contains another ResultSet when calling getObject():

The following works for me:

ResultSet rs = stmt.executeQuery("select * from usp_sel_article_initialdata_new1()");
if (rs.next())
{
  // first result set returned
  Object o = rs.getObject(1);
  if (o instanceof ResultSet)
  {
    ResultSet rs1 = (ResultSet)o;
    while (rs1.next())
    {
       int id = rs1.getInt(1);
       String name = rs1.getString(2);
       .... retrieve the other columns using the approriate getXXX() calls
    }
  }
}

if (rs.next()) 
{
  // process second ResultSet 
  Object o = rs.getObject(1);
  if (o instanceof ResultSet)
  {
    ResultSet rs2 = (ResultSet)o;
    while (rs2.next())
    {
       ......
    }
  }
}

From within psql you can also use select * from usp_sel_article_initialdata_new1() you just need to use FETCH ALL afterwards. See the manual for an example: http://www.postgresql.org/docs/current/static/plpgsql-cursors.html#AEN59018

postgres=> select * from usp_sel_article_initialdata_new1();
 usp_sel_article_initialdata_new1
----------------------------------
 <unnamed portal 1>
 <unnamed portal 2>
(2 rows)

postgres=> fetch all from "<unnamed portal 1>";
 ?column?
----------
        1
(1 row)

postgres=> fetch all from "<unnamed portal 2>";
 ?column?
----------
        2
(1 row)

postgres=>

(I created a dummy function for the above example that only returns a single row with the value 1 for the first cursor and 2 for the second cursor)

Edit:

In order for this to work, this needs to be run inside a transaction. Therefor autocommit must be turned off:

connection.setAutoCommit(false);