Re: how to resolve org.postgresql.util.PSQLException: ResultSet notpositioned properly, perhaps you need to call next.

> On Sep 2, 2019, at 12:28 AM, Karen Goh <karenworld@yahoo.com> wrote:
>
> Hi experts,
>
> I have been trying to find a solution in the internet but there is only 1 solution offered by stackoverflow in which
theuser uses if it is not there then use a else to print out there is no more data/row that appeared in that column. 
>
> Basically, I was trying to get a List<String> which meet certain search condition so the data will come from 2 tables
-one of which is a column from a join table and the List<String> falls under this table. 
>
> So, here's the code that I attempt to get the data out but keep getting ResultSet not positioned properly.
>
>     String[] subjectNames = request.getParameterValues("txtsubjects");
>             String zipcode = request.getParameter("location");
>             List<String> subjList = new ArrayList<String>(Arrays.asList(subjectNames));
>             List<tutor> myList = new ArrayList<>();
>             ArrayList<String> subList = new ArrayList<>();
>             CopyOnWriteArrayList<String>newSub = new CopyOnWriteArrayList<String>();
>             tutor t = new tutor();
>
>
>             String sql1 = "select t.tutor_contact_no, t.zipcode, t.tutor_id, t2.subject_name FROM s_tutor t JOIN
tutor_subjectt2  ON t.tutor_id = t2.tutor_id where t.zipcode = ?  And  t2.subject_name = Any((?))"; 
>
>             PreparedStatement ps2 = connection.prepareStatement(sql1);
>             ps2.setString(1, zipcode);
>             for (int i = 0; i < subjectNames.length; i++) {
>                 Array array = connection.createArrayOf("text", subjList.toArray());
>                 ps2.setArray(2, array);
>             }
>             ResultSet rs = ps2.executeQuery();
>             while (rs.next()) {
>                 t.setContactNo(rs.getString("tutor_contact_no"));
>                 t.setZipcode(rs.getString("zipcode"));
>                 t.settutor_id(rs.getInt("tutor_id"));
>
>
>                 for (String s: subjList)
>                     if (s.contains(rs.getString("subject_name")))

Are you sure you want to add to the subList you’re iterating through?
>                       subjList.add(rs.getString("subject_name"));
>                      newSub.addAll(subjList);
> }
> myList.add(t);
>                 request.setAttribute("tutors", myList);
>                 request.setAttribute("sub", newSub);
>
> Please.  I hope someone can tell me what's wrong with the code or how to overcome this error...I have been struggling
for2 weeks already. 
>
> Thanks.
>             }
>                 myList.add(t);
>                 request.setAttribute("tutors", myList);
>                 request.setAttribute("sub", newSub);
>
>
>