Develop Reference

JTable convert all values (ints, longs etc) to String

I have a function that makes a TableModel and I'm working on something to copy the selected cell to the clipboard but the problem is let's say a table has a structure like this:
id|name
1 |shiv
I can copy the shiv correctly because it is a string but I can't copy the ID because it isn't a string.
The function to make the TableModel is as follows:
public static DefaultTableModel buildTableModel(ResultSet rs)
throws SQLException {
ResultSetMetaData metaData = rs.getMetaData();
Vector<String> columnNames = new Vector<String>();
int columnCount = metaData.getColumnCount();
for (int column = 1; column <= columnCount; column++) {
columnNames.add(metaData.getColumnName(column));
}
Vector<Vector<Object>> data = new Vector<Vector<Object>>();
while (rs.next()) {
Vector<Object> vector = new Vector<Object>();
for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++) {
vector.add(rs.getObject(columnIndex));
}
data.add(vector);
}
return new DefaultTableModel(data, columnNames);
}
What should I change in it so that it works with all fields?

table.getModel().getValueAt(row_index, col_index);
This will return selected element as object. If you want to convert it to int you need to parse.
int i = (Integer) object;
If it is long value
Long a = (Long)object;

INSERT row does not update JTable in GUI

As mentioned in the header I cannot get my JTable to update with a new row unless I restart the program. When I restart, the new row is there and everything is as it should be. I have tried revalidating/repainting the panel and frame, I have tried the fire methods. I'm at a loss. Thanks in advance
ActionListener (in adminGUI class) for 'Add' button:
if(source.equals(add2)){
String c = itb.getText();
int a = main.getResults();
boolean matches = Pattern.matches("[A-Z][a-z]+", c);
if(matches == true){
main.addGenre(a, c);
}
String Method(in main class) to add a row to the database table:
public static void addGenre(int a, String b){
int rowsAdded;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection connect =DriverManager.getConnection("jdbc:odbc:MovieDB");
Statement stmt = connect.createStatement();
String query = "INSERT INTO Genres (genre_id, genre_name)" + "VALUES(" + a + ", '" + b + "')";
rowsAdded = stmt.executeUpdate(query);
}catch(Exception exc){}
}
Method(also in main class) to increment the auto-increment-key column:
public static int getResults(){
int a = 0;
ResultSet ints = main.getResults("Select genre_id from Genres");
try {
while(ints.next()){
int d = ints.getInt("genre_id");
if(d>a){
a = d;
}
a++;
}
} catch (SQLException ex) {
Logger.getLogger(main.class.getName()).log(Level.SEVERE, null, ex);
}
return a;
}
JTable details:
ResultSet rs1 = main.getResults("Select * from Genres");
JTable tab1 = new JTable(DbUtils.resultSetToTableModel(rs1));
DbUtils.resultSetToTableModel details :
public class DbUtils {
public static TableModel resultSetToTableModel(ResultSet rs) {
try {
ResultSetMetaData metaData = rs.getMetaData();
int numberOfColumns = metaData.getColumnCount();
Vector columnNames = new Vector();
// Get the column names
for (int column = 0; column < numberOfColumns; column++) {
columnNames.addElement(metaData.getColumnLabel(column + 1));
}
// Get all rows.
Vector rows = new Vector();
while (rs.next()) {
Vector newRow = new Vector();
for (int i = 1; i <= numberOfColumns; i++) {
newRow.addElement(rs.getObject(i));
}
rows.addElement(newRow);
}
return new DefaultTableModel(rows, columnNames);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}

"I cannot get my JTable to update with a new row unless I restart the program."
I think what you're expecting is that when the database table update, so should your JTable. It doesn't really work like that. You need to update the TableModel, and the JTable will be automatically updated
Since resultSetToTableModel returns a DefuaultTableModel, you can use either of the two methods from DefaultTableModel:
public void addRow(Object[] rowData) - Adds a row to the end of the model. The new row will contain null values unless rowData is specified. Notification of the row being added will be generated.
public void addRow(Vector rowData) - Adds a row to the end of the model. The new row will contain null values unless rowData is specified. Notification of the row being added will be generated.
So when your are adding the data to the database, you also want to update the DefaultTableModel like this
public static void addGenre(Integer a, String b){
...
rowsAdded = stmt.executeUpdate(query);
if (rowsAdded > 0) {
DefaultTableModel model = (DefaultTableModel)tab1.getModel();
model.addRow( new Object[] { a, b });
}
}
Also noticed I changed the method signature to Integer instead of int so it will fit with the Object[] passed to addRow. The int you pass to it will get autoboxed to Integer
SIDE NOTES
Don't swallow you exception by putting nothing in the catch block. Put something meaningful that will notify you of any exceptions that may occur, like
catch(Exception ex) {
ex.printStackTrace();
}
You should also close your Connections, Statements, and ResultSets
You should use PreparedStatement instead of Statement, to avoid SQL injection.

private void resetListData() throws ClassNotFoundException, SQLException
{
Connection cne = null;
try {
Class.forName("org.sqlite.JDBC");
cne = DriverManager.getConnection("jdbc:sqlite:table.sqlite");
cne.setAutoCommit(false);
PreparedStatement psd = (PreparedStatement) cne.prepareStatement("Select * from Genres");
psd.execute();
ResultSet r = psd.getResultSet();
ResultSetMetaData rsmd = r.getMetaData();
int count = rsmd.getColumnCount();
String[] meta = new String[count];
for (int i = 0; i < count; i++)
{
String name = rsmd.getColumnName(i + 1);
meta[i] = name;
//System.out.println(name);
}
model = new DefaultTableModel(new Object[][]{}, new String[]{"name", "address"});
jTable1.setModel(model);
while (r.next())
{
Object[] row = new Object[count];
for (int i = 1; i <= count; ++i)
{
row[i - 1] = r.getString(i); // Or even rs.getObject()
}
model.addRow(row);
}
cne.close();
} catch (ClassNotFoundException | SQLException e) {
}
}
Use this code. so you can insert one row at the end of Jtable without restarting application.,
Thanks..

Add/Delete Data from Database in JTable improperly

I create Jtable that store data from the database that I can delete/add contents' the Jtable with Jbutton. When I t try to run the code, I got this result:
When I add data into Jtable twice,there is data in it with an extra blank row
When I delete data into Jtable twice,data in a specific row is deleted but it add a transparent blank row too.
Why does this happen?
Here the code that I think there is a problem:
//add,delete button
final JToggleButton tglbtnAdd = new JToggleButton("Add");
final JToggleButton tglbtnDelete = new JToggleButton("Delete");
JButton button = new JButton("1");
button.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent arg0) {
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection dbconbt1 = DriverManager.getConnection("" +"jdbc:sqlserver://localhost;databaseName=Store;user=sa;password=");
Statement sqlstatement = dbconbt1.createStatement();
ResultSet dbresultset1 = sqlstatement.executeQuery("select * from Store.dbo.Product where ProductID = 'P-1'");
ResultSetMetaData rsmetadata = dbresultset1.getMetaData(); // Get metadata on them
int numcols = rsmetadata.getColumnCount(); // How many columns?
// Get column names
for (int i = 1; i <= numcols; i++) {
defaultmodel2.addColumn( rsmetadata.getColumnName(i));
}
if(tglbtnAdd.isSelected() == true) {
while (dbresultset1.next()) {
Vector<Object> row = new Vector<Object>(numcols);
for (int i = 1; i <= numcols; i++) {
row.addElement( dbresultset1.getObject(i) );
}
defaultmodel2.addRow(row );
}
}
if(tglbtnDelete.isSelected() == true) {
/**while (dbresultset1.next())
{
Vector<Object> row = new Vector<Object>(numcols);
row.removeElement( dbresultset1.getObject(0) );
}
*/
defaultmodel2.removeRow(0);
}
// Get row
dbresultset1.close();
sqlstatement.close();
dbconbt1.close();

Make your table structure on form load only, and just take your data from JTextField's (or from whatever you use) into Object array. Finally, add the object array to your model. For delete, just call model.removeRow() method.

JTable cell not editable but clickable

I want to put an action whenever someone clicks a cell. open another gui for example. But how do i make a cell clickable BUT not editable? These are results for an sql query. I can't manage to make the table uneditable though. Do I need a listener or something? and if yes where should I put it?
Here is my code:
public class AllResultsFromDB extends JFrame
{
GUI ins = new GUI();
public AllResultsFromDB(GUI x)
{
Vector columnNames = new Vector();
Vector data = new Vector();
this.ins = x;
try
{
// Initializing GUI class in order to call getSelectedTable() method.
// GUI ins = new GUI();
//System.out.println(ins.getSelectedTable());
Login sgui = new Login();
String dburl = "jdbc:oracle:thin:#localhost:1521:ORCL";
Connection connection = DriverManager.getConnection( dburl, sgui.getUsername(), sgui.getPassword() );
// Fetch data from table specified by user
String query = "SELECT * FROM " + ins.getSelectedTable() + " ORDER BY id";
System.out.println(query);
Statement stmt = connection.createStatement();
ResultSet rset = stmt.executeQuery(query);
ResultSetMetaData metad = rset.getMetaData();
int columns = metad.getColumnCount();
// This loop gets the names of the columns
for (int i = 1; i <= columns; i++)
{
columnNames.addElement( metad.getColumnName(i) );
//columnNames.addElement("PROFILES");
}
// This loop gets the data inside the rows
while (rset.next())
{
Vector row = new Vector(columns);
//Vector b = new Vector((Collection)button);
for (int i = 1; i <= columns; i++)
{
row.addElement( rset.getObject(i) );
}
data.addElement( row );
//data.addElement(b);
}
rset.close();
stmt.close();
connection.close();
// Create table with results
JTable table = new JTable(data, columnNames)
{
public Class getColumnClass(int column)
{
for (int row = 0; row < getRowCount(); row++)
{
Object obj = getValueAt(row, column);
if (obj != null)
{
return obj.getClass();
}
}
return Object.class;
}
};
JScrollPane scroll = new JScrollPane( table );
getContentPane().add( scroll );
//table.addMouseListener(l);
//table.setEnabled(false);
//table.setDragEnabled(true);
JPanel panel = new JPanel();
getContentPane().add( panel, BorderLayout.SOUTH );
} catch (SQLException e) {
}
}
}

Start by taking a look at How to use tables
The isCellEditable method the TableModel determines of a cell is editable or not. This method should return false
When you supply column/data information to the JTable directly, the JTable creates a DefaultTableModel internally. This class's isCellEditiable method will return true by default.
By using something like DefaultTableModel, you can override this method without with to much trouble and set the model to the table directly.
Next, you need to attach a MouseListener to the table
Take a look at How to write a Mouse Listener
You can then use getSelectedColumn, getSelectedRow to get the selected cell.
You'll also need to use convertRowIndexToModel and convertColumnIndexToModel to convert between the view and model indices

Refresh JTable data after updating database

I have a JTable that I created with the Netbeans GUI creator and populated the table by using Vector objects. I want the table to be updated after a change is made to the database. I'm not sure how to do this. Could anyone please guide me through doing this?

Try to put this after your update code
rs=st.executeQuery("select * from Table order by columnName");
table.setModel(buildTableModel(rs));
//Create function
private TableModel buildTableModel(ResultSet rs) throws SQLException {
ResultSetMetaData metaData = rs.getMetaData();
// names of columns
Vector<String> columnNames = new Vector<String>();
int columnCount = metaData.getColumnCount();
for (int column = 0; column < columnCount; column++) {
columnNames.add(metaData.getColumnName(column));
}
// data of the table
Vector<Vector<Object>> data = new Vector<Vector<Object>>();
while (rs.next()) {
Vector<Object> vector = new Vector<Object>();
for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++) {
vector.add(rs.getObject(columnIndex));
}
data.add(vector);
}
return new DefaultTableModel(data, columnNames);
}