Building jtree from database query

I am trying to build a JTREE from a database result-set. The resultset is listed below. I'm thinking I can somehow build a dynamic array of objects to build a TreePath, then use that to build the JTREE. Any input is appreciated.
ResultSet Output:
Here is how the results would be retrieved from the database (including the order of the output).
usr 1
local 2
sbin 2 file4
bin 3 file1
bin 3 file2
logs 3 file3
tmpdir 4
The first column is the directory name, the second column is the directory/file level/position, and the third column is the filename, if one exists.
So from above:
/usr/local/sbin has file "file4"
/usr/local/bin has files "file1" and "file2"
/usr/local/logs has file "file3" and directory "tmpdir"
How could I gather this information into an appropriate structure and create a JTREE from it.
Thanks.
-Jim

So each line would:basically...
If I don't know the entire path of the parent (because I've read in a
line that only has the "one-up" parent name) .... However, when I
read the line from the database result-set, I don't know where "local" is.See... that's another problem with that data. Maybe you know cuz it's the last node if it's all in a proper order. In which case maybe you only need to hold the last parent node... Some recursive function would be useful.
If I were going to store the data, I would store either the name as a full path:
/usr
/usr/local
/usr/loca/bin
or
usr /
local /usr
bin /usr/local
If you have that, it might be easier to figure out without having to worry about what belongs where.

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Populating JTree from database

Hi experts,
I need some feedbacks about the way i populate my JTree from database, Is there any better alternatives?
If yes, try explain it in detail.. I'm still new in Java.
Sample database table:
|       node_id      |       name      |       parent       |       hasChild      |
|         1          |     garbage     |        null        |           1         |
|         2          |       item      |          1         |           1         |
|         3          |      mouse      |          2         |           0         |
|         4          |       board     |          2         |           0         |
|         5          |       item2     |          1         |           1         |
|         6          |       item3     |          1         |           1         |
|         7          |       pants     |          5         |           0         |
-----------------------------------------------------------------------------------Here's the sample of my code:
//... ResultSet rs = .....
rs.last();
int rowCount = rs.getRow(); //Get the total number of row in database table
rs.beforeFirst();
int i = 0;
int j = 0;
String [] nodeID = new String[rowCount]; //The node ID
String [] parentID = new String[rowCount]; //A pointer to its parent ID
DefaultMutableTreeNode [] node = new DefaultMutableTreeNode[rowCount]; //The node
while(rs.next()) {
     String name = rs.getString("name");
     Boolean bool = rs.getBoolean("hasChild");
     node[i] = new DefaultMutableTreeNode(name,bool);
     parentID[i] = rs.getString("parent");
     nodeID[i] = rs.getInt("node_id") + "";
        //Set as root node when the pointer is null
     if(parentID.equals("null")) {
          rootNode = node[i];
     i++;
for(i=0; i<rowCount; i++) {
     for(j=0; j<rowCount; j++) {
          if(parentID[j].equals(nodeID[i]) && node[i] != null) {
               node[i].add(node[j]);
node[i] = null; //Obligates the parent after finish adding the child (to prevent unnecessary loops)
//... tree = new JTree(rootNode);
Thanks for the trouble,
Regards,
David

The execution time are base on the code i post'ed here.
Average over 30times using Vector = 640048 nanosecond to execute.
Vector<String> nodeID = new Vector<String>();
Vector<DefaultMutableTreeNode> node = new Vector<DefaultMutableTreeNode>();
Vector<String> parentID = new Vector<String>();
rs.last();
int rowCount = rs.getRow();
rs.beforeFirst();
k=0;
while(rs.next()) {
     String name = rs.getString("name");
     Boolean hasChild = rs.getBoolean("hasChild");
     node.addElement(new DefaultMutableTreeNode(name,hasChild));
     nodeID.addElement(rs.getInt("node_id")+"");
     parentID.addElement(rs.getString("parent"));
     if(parentID.elementAt(k).equals("null")) {
          rootNode = node.elementAt(k);
     k++;
i=0;
while(i<rowCount) {
     j=0;
     while(j<rowCount) {
          if(parentID.elementAt(j).equals(nodeID.elementAt(i)) && node.elementAt(j) != null) {
               node.elementAt(i).add(node.elementAt(j));
               if(!node.elementAt(i).getAllowsChildren())
                    node.insertElementAt(null,j);
          j++;
     i++;
}Average over 30times using LinkedList = 95623 nanosecond to execute.
//This section will have a class Nodes
LinkedList<Nodes> gather = new LinkedList<Nodes>();
while(rs.next()) {
     node = new DefaultMutableTreeNode(rs.getString("name"),rs.getBoolean("hasChild"));
     gather.add(new Nodes(rs.getInt("node_id") + "",node,rs.getString("parent")));
for(Nodes findParent : gather) {
     if(findParent.getParentID().equals("null")) {
          findParent.setRoot(findParent.getNode());
          rootNode = findParent.getRoot();
     for(Nodes findChild : gather){
          if(findChild.getParentID().equals(findParent.getNodeID()))
               findParent.getNode().add(findChild.getNode());
}As for the Array method i used from the previous post, the Average code execution time is x3 larger than the vector i used. So please do not use that method.
Note: 1. The code i post can be improved further. 2. Execution time is based on individual computer.
Well, I think i'll stop here. Anyone who wanted to know which method is more efficient currently, here's the answer.
Hope that it helps anyone who have the problem here =).
Edited by: DavidTW on May 23, 2011 3:14 PM
Improved Version : Using for-each loop ( Effective Java, Second Edition, Joshua Bloch, Pg. 210).

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short example:
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Dearly regards!

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Generate an xml file from Database query results

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i'm trying to build a community website that has a guestbook
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Jtree from database

hii all,
Does any one know hw to populate a Jtree from a database.pls hlep me with an example.
thanx

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etc.
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This compiles and works (with 1.4):
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import javax.swing.*;
import javax.swing.tree.*;
import java.util.HashMap;
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     while(true) {
          DefaultMutableTreeNode tempNode = null;
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     if(nodeMap.get(nodeKey) == null) { //no such node, must make one
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     lastNode.add(newNode);
     lastNode = newNode;
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     //You first make your tree structure with DefaultMutableNodes,
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     //Then make a Tree with the DefaultTreeModel
     DefaultTreeModel treeModel = new DefaultTreeModel(rootNode);
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getContentPane().add(yourTree, BorderLayout.CENTER);
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Jtree examples of populating data from database

I have searched many of the solutions here, but the threads that contain examples of jtree loading from an sql database are not available. Does anyone have a good example of populating a jTree from the database?
Thank You

Hi,
AFAIK, there is no direct approach to populate a JTree directly from a resultset. However, JTree can use a DOM tree as its model by using the adapter pattern. The procedure to do this is well-documented in the SUN website and the link is provided below. The code to convert a resultset to XML is provided below:
protected void resultSetToXML(OutputStream out,
ResultSet rs,
String stylesheet)
throws IOException, ServletException {
// Create reader and source objects
SqlXMLReader sxreader = new SqlXMLReader();
SqlInputSource sis = new SqlInputSource(rs);
// Create SAX source and StreamResult for transform
SAXSource source = new SAXSource(sxreader, sis);
StreamResult result = new StreamResult(out);
// Perform XSLT transform to get results. If "stylesheet"
// is NULL, then use identity transform. Otherwise, parse
// stylesheet and build transformer for it.
try {
// Create XSLT transformer
TransformerFactory tf = TransformerFactory.newInstance();
Transformer t;
if (stylesheet == null) {
t = tf.newTransformer();
} else {
// Read XSL stylesheet from app archive and wrap it as
// a StreamSource. Then use it to construct a transformer.
InputStream xslstream = _config.getServletContext().
getResourceAsStream(stylesheet);
StreamSource xslsource = new StreamSource(xslstream);
t = tf.newTransformer(xslsource);
// Do transform
t.transform(source, result);
} catch (TransformerException tx) {
throw new ServletException(tx);
The classes SQLXMLReader and other classes used in this example are available in the following java packages.
import java.sql.*;
import javax.sql.DataSource;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.sax.*;
import javax.xml.transform.stream.*;
import org.w3c.dom.*;
import org.xml.sax.*;
import org.xml.sax.helpers.AttributesImpl;
The following is the link that explains how to load a JTree from DOM.
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/JAXPDOM6.html
Cheers,
vidyut

Want JTree e.g. of populating data from database.

I want ur JTree example of populating data from database, can u plz give me that eg.?
Awaiting 4 ur reply.

Hi,
AFAIK, there is no direct approach to populate a JTree directly from a resultset. However, JTree can use a DOM tree as its model by using the adapter pattern. The procedure to do this is well-documented in the SUN website and the link is provided below. The code to convert a resultset to XML is provided below:
protected void resultSetToXML(OutputStream out,
ResultSet rs,
String stylesheet)
throws IOException, ServletException {
// Create reader and source objects
SqlXMLReader sxreader = new SqlXMLReader();
SqlInputSource sis = new SqlInputSource(rs);
// Create SAX source and StreamResult for transform
SAXSource source = new SAXSource(sxreader, sis);
StreamResult result = new StreamResult(out);
// Perform XSLT transform to get results. If "stylesheet"
// is NULL, then use identity transform. Otherwise, parse
// stylesheet and build transformer for it.
try {
// Create XSLT transformer
TransformerFactory tf = TransformerFactory.newInstance();
Transformer t;
if (stylesheet == null) {
t = tf.newTransformer();
} else {
// Read XSL stylesheet from app archive and wrap it as
// a StreamSource. Then use it to construct a transformer.
InputStream xslstream = _config.getServletContext().
getResourceAsStream(stylesheet);
StreamSource xslsource = new StreamSource(xslstream);
t = tf.newTransformer(xslsource);
// Do transform
t.transform(source, result);
} catch (TransformerException tx) {
throw new ServletException(tx);
The classes SQLXMLReader and other classes used in this example are available in the following java packages.
import java.sql.*;
import javax.sql.DataSource;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.sax.*;
import javax.xml.transform.stream.*;
import org.w3c.dom.*;
import org.xml.sax.*;
import org.xml.sax.helpers.AttributesImpl;
The following is the link that explains how to load a JTree from DOM.
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/JAXPDOM6.html
Cheers,
vidyut

Building jtree from database query

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