Develop Reference

search between dates how to show in jtable

Here is code, i am using 2 jdatechooser and i put the codes in a button. I am also not sure if the query is correct.
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String url="jdbc:sqlserver://USER-PC:1433;databaseName=tblgg";
String userr="sa";
String passs="1234";
Connection con=DriverManager.getConnection(url,userr,passs);
java.util.Date first = dt1.getDate();
java.util.Date second = dt2.getDate();
String sql="SELECT * FROM tbl_sale WHERE date between '"+ first+"'and
'"+second+"'";
PreparedStatement pst= con.prepareStatement(sql);
ResultSet rs = pst.executeQuery();
tblsale.setModel(DbUtils.resultSetToTableModel(rs));
}
catch (Exception e)
{
JOptionPane.showMessageDialog(null, e);
}
}
Okay i edit my code. xD now something is happening but nothing is showing up.

To correct your lack of prepared statement usage. Try this
Resuse your connection
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String url="jdbc:sqlserver://USER-PC:1433;databaseName=tblgg";
String userr="sa";
String passs="1234";
Connection con=DriverManager.getConnection(url,userr,passs);
ResultSet result = null;
String sql2 = "select\n" +
"*\n" +
"from student\n" +
"where date(first) > ? and date(second) < ?";
PreparedStatement ps1 = con.prepareStatement( sql2, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY) ;
ps1.setObject (1 , startDatePicker.getModel().getValue());
ps1.setObject (2 , endDatePicker.getModel().getValue());
result = ps1.executeQuery();
// get number of rows
result.last();
numRows = result.getRow();
result.first();
//Get metadata object for result
ResultSetMetaData meta = result.getMetaData();
// create an arry of string for the colum names
colNames = new String[meta.getColumnCount()];
// store column names in the new col names array
for( int i = 0; i< meta.getColumnCount(); i++)
{
//get column name
colNames[i] = meta.getColumnLabel(i+1);
}
// create 2 d string array for table data
tableData = new String [numRows][meta.getColumnCount()];
// store columns in the data
for ( int row = 0 ; row < numRows; row++)
{
for (int col = 0; col < meta.getColumnCount(); col++)
{
tableData[row][col]= result.getString(col + 1);
}
result.next();
}
// close statement
ps1.close();
connection.close();
System.out.println("Data Table Loaded.");
}
To show the created result data set you use these lines
JTable table = new JTable(tableData,colNames);
JScrollPane scrollPane = new JScrollPane(table);
Don't forget to add the scroll pane to your JPanel
panel.add(scrollPane);

Optimize data calling in JDBC onto JTable

currently I have data in MySQL server and I am calling the datas onto the JTable through JDBC. However there are 1369 rows and it seems that it has too much data for it to load. It usually takes 5 minutes to load. Are there anyways to optimize the process? This is my code(I apologize in advance for a messy code):
public class DataTable {
private String databaseName = "*****";
private String tableName = "******";
public void showDatabase(){
Connection conn = null;
DatabaseMetaData meta = null;
Statement stmt = null;
ResultSet rs = null;
int k = 0;
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
String connectionUrl = "jdbc:mysql://localhost:3306/" + databaseName;
String connectionUser = "*****";
String connectionPassword = "*****";
conn = DriverManager.getConnection(connectionUrl, connectionUser, connectionPassword);
stmt = conn.createStatement();
meta = conn.getMetaData();
dataSets(stmt, meta);
}catch(Exception e){
e.printStackTrace();
} finally{
try { if (rs != null) rs.close(); } catch (SQLException e) { e.printStackTrace(); }
try { if (stmt != null) stmt.close(); } catch (SQLException e) { e.printStackTrace(); }
try { if (conn != null) conn.close(); } catch (SQLException e) { e.printStackTrace(); }
}
}
//return the column size of the table
public int getColumnNumber(DatabaseMetaData meta, Statement stmt) throws SQLException
{
//ResultSet rs = meta.getColumns(null, null, "practiceexample", null);
ResultSet rs = stmt.executeQuery("SELECT * FROM " + tableName);
ResultSetMetaData rsmd = rs.getMetaData();
int columnsNumber = rsmd.getColumnCount();
return columnsNumber;
}
//return the rowNumber of the tables
public int getRowNumber(Statement stmt) throws SQLException
{
ResultSet rs = stmt.executeQuery("SELECT COUNT(*) FROM " + tableName);
int rowCount = 0;
while(rs.next()){
rowCount = rs.getInt(1);
}
return rowCount;
}
public void dataSets(Statement stmt, DatabaseMetaData meta) throws SQLException
{
String[] columnNames = new String[getColumnNumber(meta, stmt)];
String[][] dataSets = new String[getRowNumber(stmt)][columnNames.length];
ResultSet column = meta.getColumns(null, null, tableName, null);
int i = 0;
while(column.next())
{
columnNames[i] = column.getString("COLUMN_NAME");
//columnNames.add(i, column.getString("COLUMN_NAME"));
i++;
}
for(int j = 0; j < dataSets.length; j++)
{
String[] singleRowData = new String[columnNames.length];
ResultSet data = null;
for(int k = 0; k < columnNames.length; k++)
{
String columnName = columnNames[k];
data = stmt.executeQuery("SELECT " + columnName +
" FROM " + tableName + " LIMIT " + j + ", " + 1);
while(data.next())
{
singleRowData[k] = data.getString(columnName);
}
}
dataSets[j] = singleRowData;
}
SimpleTable table = new SimpleTable(columnNames, dataSets);
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
table.createAndShowGUI();
}
});
}
class SimpleTable{
String[] columns;
String[][] dataSets;
public SimpleTable(String[] columns, String[][] dataSets){
this.columns = columns;
this.dataSets = dataSets;
}
public void createAndShowGUI(){
JPanel gui = new JPanel(new BorderLayout(3, 3));
final JTable table = new JTable(new DefaultTableModel(dataSets, columns));
final JScrollPane scrollPane = new JScrollPane(table, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED
, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
Dimension dimension = table.getPreferredSize();
scrollPane.setPreferredSize(new Dimension(dimension.width, table.getRowHeight() * 30));
JPanel navigation = new JPanel(new FlowLayout(FlowLayout.CENTER));
JButton next = new JButton(">");
next.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
int height = table.getRowHeight() * (20-1);
JScrollBar bar = scrollPane.getVerticalScrollBar();
bar.setValue(bar.getValue() + height);
}
});
JButton previous = new JButton("<");
previous.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent ae) {
int height = table.getRowHeight()*(20-1);
JScrollBar bar = scrollPane.getVerticalScrollBar();
bar.setValue( bar.getValue()-height );
}
} );
navigation.add(previous);
navigation.add(next);
gui.add(scrollPane, BorderLayout.CENTER);
gui.add(navigation, BorderLayout.SOUTH);
JOptionPane.showMessageDialog(null, gui);
}
}
}

IMHO the root of the bad permormance is you unnecessarily query the database mutliple times to get the data (columns, rows, rows number, columns number, etc) you need:
To get columns number:
ResultSet rs = stmt.executeQuery("SELECT * FROM " + tableName);
To get rows number:
ResultSet rs = stmt.executeQuery("SELECT COUNT(*) FROM " + tableName);
To get rows (this is the worst beacuse it's inside a loop):
data = stmt.executeQuery("SELECT " + columnName + " FROM " + tableName + " LIMIT " + j + ", " + 1);
How to solve it
Just query the database once. A single ResultSet and its associated ResultSetMetaData should be enough to accomplish your goal. Additionaly, and as already suggested, use a SwingWorker to do database calls in a separate thread. For example:
final JTable table = new JTable();
SwingWorker<Void, TableModel> worker = new SwingWorker<Void, TableModel> () {
#Override
protected Void doInBackground() throws Exception {
ResultSet resultSet = stmt.executeQuery("SELECT * FROM " + tableName);
ResultSetMetaData metaData = resultSet.getMetaData();
int columnCount = metaData.getColumnCount(); // columns number
String[] columnNames = new String[columnCount];
for (int i = 1; i <= columnCount; i++) {
columnNames[i] = metaData.getColumnName(i); // fill columns names
}
resultSet.last();
int rowCount = resultSet.getRow(); // get rows number
resultSet.beforeFirst();
Object[][] data = new Object[rowCount][columnCount];
int currentRow = 0;
while (resultSet.next()) {
for (int currentColumn = 1; currentColumn <= columnCount; currentColumn++) {
data[currentRow][currentColumn - 1] = resultSet.getObject(currentColumn); // fill data set
}
currentRow++;
}
TableModel model = new DefaultTableModel(data, columnNames);
publish(model);
return null;
}
#Override
protected void process(List<TableModel> chunks) {
TableModel model = chunks.get(0);
table.setModel(model);
}
}
worker.execute();

unable to get data from the database in a JTable?

i'm trying to display the data of a table in the form of a JTable.
My table is in Oracle 10g Express Edition.
T.name: Doctor
I want that the entire table should be displayed in my form with the help of a JTable.
class PatientTableFromDatabase extends JFrame
{
static Connection con=null;
Statement st=null;
ResultSet rs=null;
PatientTableFromDatabase()
{
Vector columnNames = new Vector();
Vector data = new Vector();
try
{
// Connect to the Database
try{
//Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//cn=DriverManager.getConnection("Jdbc:Odbc:pat");
Class.forName("oracle.jdbc.OracleDriver");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:#localhost:1522:xe", "hr", "hr");
}
catch(Exception e)
{
//System.out.println(e);
e.printStackTrace();
}
// Read data from a table
String sql = "Select * from Doctor";
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery( sql );
ResultSetMetaData md = rs.getMetaData();
int columns = md.getColumnCount();
// Get column names
for (int i = 1; i <= columns; i++)
{
columnNames.addElement(md.getColumnName(i));
}
// Get row data
while (rs.next())
{
Vector row = new Vector(columns);
for (int i = 1; i <= columns; i++)
{
row.addElement(rs.getObject(i));
}
data.addElement( row );
}
}
catch(Exception e)
{
System.out.println( e );
//e.printStackTrace();
}
// Create table with database data
JTable table = new JTable(data, columnNames);
JScrollPane scrollPane = new JScrollPane(table);
getContentPane().add( scrollPane );
/* JPanel buttonPanel = new JPanel();
getContentPane().add( buttonPanel, BorderLayout.SOUTH );*/
}
public static void main(String[] args)
{
PatientTableFromDatabase frame = new PatientTableFromDatabase();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}
when i run the frame appears but with no data,no table.
Please Help!!
Thanks

you sql query is empty
ResultSet rs = stmt.executeQuery( );
try with
ResultSet rs = stmt.executeQuery( sql);

You have two variables called con
The first one is the static one defined at the top of your class, and then you define it again in your try-catch block on line 21.
On line 34 you are using the uninitialized version of con and therefore you get the NullPointerException.
To fix this issue change the code to the following:
...
try{
//Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//cn=DriverManager.getConnection("Jdbc:Odbc:pat");
Class.forName("oracle.jdbc.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:#localhost:1522:xe", "hr", "hr");
}
catch(Exception e) {
e.printStackTrace();
}
...

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..

DefaultTableModel in a JFrame only creating on Row - JAVA

Im trying to get a number of rows from a database to populate a JTable in a JFrame but its only getting the first row/entry (row 1 always). Its a list of houses + details stored in a table
public static DefaultTableModel buildTableModel(ResultSet rs)
throws SQLException {
ResultSetMetaData metaData = (ResultSetMetaData) rs.getMetaData();
// names of columns
Vector<String> columnNames = new Vector<String>();
int columnCount = metaData.getColumnCount();
for (int column = 1; column <= columnCount-1; 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);
}
How do I print out at all the rows in the table rather than just the first?
public void displaySaleProperties() throws SQLException{
Connection conn = null;
try {
conn = DriverManager.getConnection(CONN_STRING, USERNAME, PASSWORD);
System.out.println("Connected to database.");
// The Connection is obtained
Statement Stmt = (Statement) conn.createStatement();
// Stmt.execute(createPropertyTable);
ResultSet rs = Stmt.executeQuery("select * from PropertySale");
// It creates and displays the table
JTable table = new JTable(buildTableModel(rs));
table.setPreferredSize(new Dimension(1150,17));
// JOptionPane.showMessageDialog(null, new JScrollPane(table));
final JPanel panelOne = new JPanel();
panelOne.setVisible(true);
panelOne.setBackground(Color.LIGHT_GRAY);
// JFRAME
final JFrame topFrame = new JFrame();
topFrame.setSize(1200, 300);
topFrame.setLocationRelativeTo ( null );
topFrame.setVisible(true);
topFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
// PUT TOGETHER
topFrame.add(panelOne);
panelOne.add(table);
panelOne.revalidate();
panelOne.repaint();
// Closes the Connection
} catch (SQLException e) {
System.err.println("Cannot connect to database." + e);
} finally {
if(conn != null){
conn.close();
}
}
}

Remove the line with:
table.setPreferredSize(new Dimension(1150,17));
In another way, may you want to use a scroll pane:
JTable table = new JTable(buildTableModel(rs));
JScrollPane scrollPane = new JScrollPane(table);
topFrame.add(scrollPane);