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create or replace package pkg_test as

type t_ref is ref cursor;
procedure p_test(cur_ref out t_ref);

end pkg_test;
/

create or replace package body pkg_test as

procedure p_test(cur_ref out t_ref) is

begin
open cur_ref for 'select * from test';
end p_test;

end pkg_test;
/

oracle.jdbc.OracleCallableStatement cs = null;
String sqlStr = "{call firstpage.getSeniorHighSchool(?,?,?)}";
ResultSet rs = null;
try{
cs = (oracle.jdbc.OracleCallableStatement)conn.prepareCall(sqlStr);
cs.setLong(1,arg[0]);
cs.setLong(2,arg[1]);

cs.registerOutParameter(3,oracle.jdbc.OracleTypes.CURSOR);
cs.execute();
rs = cs.getCursor(3);

while(rs.next()){
//...........
}
rs.close();
cs.close();
}catch(Exception e){
System.out.println("produce error ");
e.printStackTrace();
} 

CallableStatement cs = null;
cs = conn.prepareCall(sql);
cs.setInt(1,maxrow);
cs.setInt(2,minrow);
cs.registerOutParameter(3,oracle.jdbc.OracleTypes.CURSOR);
cs.execute();
rs = (ResultSet)cs.getObject(3);