I have a small app. With this app, I can add a new Employee record to a MySQL database and then display these records. buildData()
retrieves data from the database and displays it in the TableView, I also call this method every time a new record is added to "refresh" the TableView. This however isn't behaving as expected.
This is the view after the first record is added:
when I hit the button to add another record, this is what I get:
If I close the app and reopen it, the TableView is normal:
This is what the buildData()
method looks like (Method ignores Typechecking and all that.Probably the cause?)
private ObservableList<ObservableList> data;
public void buildData() {
Connection c;
TableColumn col;
data = FXCollections.observableArrayList();
try {
c = DataBaseConnection.connectToDatabase();
String SQL = "SELECT * FROM employees";
ResultSet rs = c.createStatement().executeQuery(SQL);
for (int i = 0; i < rs.getMetaData().getColumnCount(); i++) {
final int j = i;
col = new TableColumn(rs.getMetaData().getColumnName(i + 1));
col.setCellValueFactory(new Callback<TableColumn.CellDataFeatures<ObservableList, String>, ObservableValue<String>>() {
public ObservableValue<String> call(TableColumn.CellDataFeatures<ObservableList, String> param) {
return new SimpleStringProperty(param.getValue().get(j).toString());
}
});
employeeTableView.getColumns().addAll(col);
}
while (rs.next()) {
ObservableList<String> row = FXCollections.observableArrayList();
for (int i = 1; i <= rs.getMetaData().getColumnCount(); i++) {
row.add(rs.getString(i));
}
data.add(row);
}
employeeTableView.setItems(data);
} catch (Exception e) {
e.printStackTrace();
System.out.println("Error on Building Data");
}
}
and then the method to add a new Employee Record to the database:
public void addEmployeeToDatabase() {
Employee employee = new Employee("Anne Droid", "Marketing", "Gender");
String query = "INSERT INTO employees (Employee_Name, Department, Gender) VALUES (?, ? , ?)";
try {
preparedStatement = connection.prepareStatement(query);
preparedStatement.setString(1, employee.getEmployeeName());
preparedStatement.setString(2, employee.getDepartment());
preparedStatement.setString(3, employee.getGender());
preparedStatement.execute();
buildData();
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
Finally, the Employee class:
public class Employee {
private StringProperty employeeName;
private StringProperty department;
private StringProperty gender;
public Employee() {
}
public Employee(String employeeName, String department, String gender) {
this.employeeName = new SimpleStringProperty(employeeName);
this.department = new SimpleStringProperty(department);
this.gender = new SimpleStringProperty(gender);
}
public String getEmployeeName() {
return employeeName.get();
}
public StringProperty employeeNameProperty() {
return employeeName;
}
...
Am using pure java, no FXML.I've searched for a solution, but none is available (As far as I can tell). Any pointers?
In the
buildData
method you replace the items. However you add newTableColumn
s to thecolumns
list without removing any columns. This way the number of columns is increased every time you call thebuildData
method.Clear the
columns
list before adding new columns to fix this: