JTree building frrom database values.

Question

Hi,
Im building a JTree from values which are present in the database. How do I go about doing this?Presently I have retreived values from the db and have those in a HashMap. I am stuck from this point on...Can someone please help me?
Thanks in advance
Sudarshan

Answer 1

final DefaultMutableTreeNode root = new DefaultMutableTreeNode(new NodeInfo(" Employees","","","","","","","",""));
createNodes(root); // create nodes here
private void createNodes(DefaultMutableTreeNode root) {
  // pass in tree root node
  formConnection = null;
  Statement selectEmployees = null;
  ResultSet rs = null;
  String employee_Name;
  String middle_Name;
  String employee_ID;
  String employee_Classification;
  String employee_Photo = "";
  String employee_Branch;
  try {
    // establish your database connection
    Connection formConnection = ?????????
    selectEmployees = formConnection.createStatement();
    String employeeSelect = "select * from employees where Last_name <> 'DELETED' order by Last_name, First_name, Middle_name";
    rs = selectEmployees.executeQuery(employeeSelect);
    // Now create the tree
    while(rs.next()) {
      employee_Name = new String(rs.getString("Last_name")).trim() + " " + new String(rs.getString("First_name")).trim();
      middle_Name = new String(rs.getString("Middle_name")).trim();
      if (!middle_Name.equals("")) {employee_Name = employee_Name + ", " + middle_Name;}
      employee_ID = new String(rs.getString("Employee_ID")).trim();
      employee_Classification = new String(rs.getString("classification")).trim();
      employee_Branch = new String(rs.getString("Branch_ID")).trim();
      createEmployeeNodeSet(root, employee_ID, employee_Name, employee_Classification, employee_Photo, rs.getString("First_name").trim(), rs.getString("Middle_name").trim(), rs.getString("Last_name").trim(), employee_Branch);
    rs.close();
    // close your database connection here
  catch (Exception fieldEx) {
    // Unable to load employee tree data
private void createEmployeeNodeSet(DefaultMutableTreeNode root, String employee_ID, String employee_Name, String employee_Classification, String employee_Photo, String emp_First, String emp_Middle, String emp_Last, String emp_Branch) {
  DefaultMutableTreeNode leaf = null;
  DefaultMutableTreeNode employee = new DefaultMutableTreeNode(new NodeInfo(employee_Name,employee_ID,employee_Name,employee_Classification,employee_Photo,emp_First,emp_Middle,emp_Last,emp_Branch));
  root.add(employee);
  newNode = employee;
  for (int i = 0; i < leafCtrl.length;i++ ) {
    // here I create a set of leaf nodes for each employee (held in leafCtrl string array)- not necessary
    leaf = new DefaultMutableTreeNode(new NodeInfo((String)leafCtrl[0],employee_ID,employee_Name,employee_Classification,employee_Photo,emp_First,emp_Middle,emp_Last,emp_Branch));
employee.add(leaf);
// node I use - it has additional information I keep for other uses
private class NodeInfo {
public String nodeText; // Node display text
public String employeeID; // ID
public String employeeName; // complete name
public String employeeType; // type
public String employeePhoto; // photo info
public String employeeFirst; // first name
public String employeeMiddle; // middle name
public String employeeLast; // last name
public String employeeBranch; // current branch
public NodeInfo(String nText, String eID, String eName, String eType, String ePhoto, String eFirst, String eMiddle, String eLast, String eBranch) {
nodeText = nText;
employeeID = eID;
employeeName = eName;
employeeType = eType;
employeePhoto = ePhoto;
employeeFirst = eFirst;
employeeMiddle = eMiddle;
employeeLast = eLast;
employeeBranch = eBranch;
public String toString() {
return nodeText;
Note there is no use keeping the data in a hash map as you can keep it in the tree.
Hope this helps
rykk