更改单元格值后，我JTable的不会刷新。我可以双击一个单元格并更改它的值，但是当我按确定或单击单元格外时，值会重置为前一个值，它不会更新表格。这是我的自定义表模型的代码，我不知道如何更新数据库，因为当我更改单元格的值时，表是从数据库中获取的。
package adisys.server.strumenti;
import java.sql.*;
import java.util.Formatter;
import javax.swing.event.TableModelEvent;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
import adisys.server.boundary.EditorPatologie;
import adisys.server.data.Database;
import adisys.server.data.Patologie;
import adisys.server.entity.Patologia;
/**
* @author Francesco
*
*/
public class ADISysTableModel extends AbstractTableModel implements TableModel {
ResultSet dati;
public ADISysTableModel(ResultSet nuoviDati)
{
dati=nuoviDati;
try {
//Trace
System.out.println("- Creazione modello tabella: \""+ dati.getMetaData().getTableName(1) +"\"");
} catch (SQLException e1) {
e1.printStackTrace();
}
}
@Override
public int getColumnCount() {
try {
return dati.getMetaData().getColumnCount();
}
catch (SQLException e) {
e.printStackTrace();
System.out.println("ERRORE: Calcolo del numero di colonne errato.");
return 0;
}
}
@Override
public int getRowCount() {
try {
//Seleziona l'ultimo elemento
dati.last();
//Restituisce l'indice dell'elemento
return (dati.getRow());
} catch (SQLException e) {
e.printStackTrace();
System.out.println("ERRORE: Calcolo del numero di righe errato. (metodo getRowCount() )");
return 0;
}
}
@Override
public Object getValueAt(int riga, int colonna) {
try {
//Sposta il cursore alla riga desiderata (con sfasamento di 1)
dati.absolute(riga+1);
//Estrae il valore nella colonna specificata e lo restituisce (con sfasamento di 1)
return dati.getObject(colonna+1);
} catch (SQLException e) {
// In caso di errore restituisce un oggetto vuoto
e.printStackTrace();
//Trace
System.out.println("ERRORE: Valore dell'elemento della tabella non valido.");
return null;
}
}
@Override
public boolean isCellEditable(int rIndex, int cIndex)
{
return true;
}
@Override
public String getColumnName(int col) {
try {
return dati.getMetaData().getColumnName(col+1);
} catch (SQLException e) {
// Eccezione
e.printStackTrace();
return "?";
}
}
public Integer getID(int riga)
{
//Ricerca colonna ID
for(int i=0; i<=getColumnCount(); i++)
if(getColumnName(i).equals("ID"))
return i;
return null;
}
/**
* Restituisce l'indice della colonna a partire dal nome della colonna ricercata
* <b>N.B. L'indice della prima colonna è 0, l'ultimo è numeroColonne-1.</b>
* @param Nome - Stringa con il nome della colonna
* @return -1 se la colonna non e' stata trovata, altrimenti l'indice della colonna
*/
public int getColumnIndex(String Nome)
{
for (int i=0; i<getColumnCount();i++)
if( getColumnName(i)==Nome) return i;
return -1;
}
}
如果您需要其他东西，例如数据库或表格编辑器的代码，请告诉我；）感谢您的帮助 :)
--EDIT-- 好吧，我已经实现了 setValueAt 方法，但是当我单击单元格时，它会给我这样的错误
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at adisys.server.strumenti.ADISysTableModel.setValueAt(ADISysTableModel.java:149)
at javax.swing.JTable.setValueAt(Unknown Source)
at javax.swing.JTable.editingStopped(Unknown Source)
at javax.swing.AbstractCellEditor.fireEditingStopped(Unknown Source)
at javax.swing.DefaultCellEditor$EditorDelegate.stopCellEditing(Unknown Source)
at javax.swing.DefaultCellEditor.stopCellEditing(Unknown Source)
at javax.swing.JTable$GenericEditor.stopCellEditing(Unknown Source)
at javax.swing.DefaultCellEditor$EditorDelegate.actionPerformed(Unknown Source)
at javax.swing.JTextField.fireActionPerformed(Unknown Source)
at javax.swing.JTextField.postActionEvent(Unknown Source)
at javax.swing.JTextField$NotifyAction.actionPerformed(Unknown Source)
at javax.swing.SwingUtilities.notifyAction(Unknown Source)
at javax.swing.JComponent.processKeyBinding(Unknown Source)
at javax.swing.JComponent.processKeyBindings(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
我的 setValueAt 方法是这样的：
Vector<Paziente> content;
@Override
public void setValueAt(Object value, int rowIndex, int columnIndex)
{
Paziente row = this.content.elementAt(rowIndex);
String strValue = (String)value;
int IDValue = (int)value;
if(columnIndex == 0)
{
row.setID(IDValue);
}
else if(columnIndex == 1)
{
row.setNome(strValue);
}
else if(columnIndex == 2)
{
row.setCognome(strValue);
}
fireTableCellUpdated(rowIndex, columnIndex);
}
你能再帮我一次吗？:) 我对这个功能越来越疯狂，我知道这对很多人来说并不难，但对我来说是......谢谢你的回答，祝你有美好的一天！:D
更新：我已经用这段代码解决了这个问题：[CODE] @Override public void setValueAt(Object value, int rowIndex, int columnIndex) {String aValue = (String)value; String formatoIstruzione = "更新 PAZIENTI SET NOME = " + "'" + aValue + "'" + " WHERE ID = " + rowIndex + ";"; Database.esegui(formatoIstruzione.toUpperCase()); Pianificatore.aggiornaTabelle(); } } [/代码]
换句话说，我启动 sql 指令来更新表，然后我刷新它的视图，所以它几乎显示了新值。谢谢大家的帮助和你给我的灵感，我们终于明白了！！* _ *