Returns o rows from sap table

Hi

I am new to sap.

I want to pull data from sap table .I have wriiten following code

  JCO.ParameterList input = function.getImportParameterList();

  input.setValue(partner.getProject(), "I_PROJECT_DEFINITION");

             log.info("New nessie partner details:populating import parameters"+partner.getProject());

  // Execute function

  client.execute(function);

  JCO.Table partnerDef = function.getTableParameterList().getTable("ET_PARTNER_DETAIL");

  for (int i = 0; i < partnerDef.getNumRows(); i++) {

  partnerDef.setRow(i);

  partner.setPartner(partnerDef.getString("PARTNER"));

  partner.setPartnerfunction(partnerDef.getString("PARTN_ROLE"));

  partner.setPartneraddress(partnerDef.getString("ADRESSE"));

  partner.setPartneraddrflag(partnerDef.getString("ADRESSS_FLAG"));

  partner.setPartnername(partnerDef.getString("NAME_LIST"));

  partner.setPartnertext(partnerDef.getString("DEVISION_TEXT"));

  retPartner.getCodes().add(partner);

  }

But i am getting 0 rows,even though table has records .

please help me on this