I am trying to insert Entity Objects into a JTable. The Object i am receiving through hibernate querys are saved here.
list = businessLayer.showAllUsers();
I am two problems.
- columnnames from Object
- insert objects into row
What i basically have to do is, show the user what is inside the DB through a JTable.
I declared all Entity Classes through hibernate annotations. So hibernate knows the names and what attributes are supposed to be columns. Is there a way to get the columnnames from the objects? For now i created a String with the columnnames for testing purposes.
I am absolutely no clue how i can display the objects in a row. I am not allowed to import entity classes with all getters and setters because i am using a facade pattern and the UI is not allowed to have information about the persistencelayer, right?
Inside actionPerformed(ActionEvent e){
if(e.getSource() == btnBenutzerAnzeigen ){
list = businessLayer.showAllUsers();
//Die enthaltenen Objecte in die Arrays ColumnNames und data ihrgendwie reinladen
System.out.println(list);
System.out.println(list.size());
columnNames = new String[] {"ID", "Surname", "Name"};
data = new Object[list.size()];
for(int i = 0; i < list.size(); i++){
data[i] = list.get(i);
}
model = new MyTableModel(columnNames, data);
table.setModel(model);
// model.data = data2;
System.out.println("Benutzer Anzeigen Button");
}
} catch (Exception ex) {
ex.printStackTrace();
JOptionPane.showMessageDialog(this, ex.getMessage(), "Fehler",
JOptionPane.ERROR_MESSAGE);
// ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE,
// QUESTION_MESSAGE, or PLAIN_MESSAGE
}
}
}
I have this code from a sampleClass from Oracle i changed it a little bit to my purpose. http://docs.oracle.com/javase/tutorial/uiswing/components/table.html#data
class MyTableModel extends AbstractTableModel {
// private String[] columnNames = {"First Name",
// "Last Name",
// "Sport",
// "# of Years",
// "Vegetarian"};
private String[] columnNames = null;
private Object[] data = null;
private Object[][] matrix;
public MyTableModel(String[] columnNames, Object[] data){
this.columnNames = columnNames;
this.data = data;
matrix = new Object[data.length][columnNames.length];
Object matrix[][] = {data, columnNames};
}
public int getColumnCount() {
return columnNames.length;
}
public int getRowCount() {
return data.length;
}
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return matrix[row][col];
}
/*
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
*/
// public Class getColumnClass(int c) {
// return getValueAt(0, c).getClass();
/ }
/*
* Don't need to implement this method unless your table's
* editable.
*/
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 2) {
return false;
} else {
return true;
}
}
/*
* Don't need to implement this method unless your table's
* data can change.
*/
public void setValueAt(Object value, int row, int col) {
if (DEBUG) {
System.out.println("Setting value at " + row + "," + col
+ " to " + value
+ " (an instance of "
+ value.getClass() + ")");
}
matrix[row][col] = value;
fireTableCellUpdated(row, col);
if (DEBUG) {
System.out.println("New value of data:");
printDebugData();
}
}
private void printDebugData() {
int numRows = getRowCount();
int numCols = getColumnCount();
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + matrix[i][j]);
}
System.out.println();
}
System.out.println("--------------------------");
}
}
