我正在尝试在Java程序中使用SQL中的“ Update”语句。另外，我使用了JTable.getSelectedRow()方法将存储在特定记录中的数据加载到我的复选框中。
“英语”，“孟加拉语”，“缅甸语”，“交流”，“基本计算”和“经验”字段是通过单击复选框设置的布尔值。但是，无论何时在更改现有值后运行更新查询，我的JTable都不会显示最新的更新值。此外，如果我更新一条记录然后单击它，则该程序不会将正确的数据加载到字段和框中。
我尝试创建了一个新的JTable，并再次重写了“ Update” JButton函数。我已经检查了指定复选框的索引，但是无论如何，只要我单击记录后，它就应该被“更新”，那么更改后的复选框就不会被选中/取消选中。 Check Box not same as JTable
public ArrayList<User> userList()
{
ArrayList<User> usersList = new ArrayList<>();
try {
Class.forName(driver);
Connection con = DriverManager.getConnection(url, user, pass);
String query1 = "SELECT * FROM CANDIDATEINFORMATION";
PreparedStatement prepStat = con.prepareStatement(query1);
ResultSet rs = prepStat.executeQuery();
User user;
while(rs.next()){
user = new User(rs.getInt(
"Candidate_ID"), rs.getString("candidate_Name"), rs.getString("candidate_Surname"), rs.getString("Nationality"), rs.getBoolean("english"), rs.getBoolean("bangla"), rs.getBoolean("burmese"),
rs.getBoolean("communication"), rs.getBoolean("basic_computing"), rs.getBoolean("experience"));
usersList.add(user);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
return usersList;
}
// following method displays MySQL data into JTable
public void Show_candidate_table(){
ArrayList<User> list = userList();
DefaultTableModel model = (DefaultTableModel) CandidateTable.getModel();
Object[] row = new Object[10];
for(int i = 0; i < list.size(); i++)
{
row[0] = list.get(i).getID();
row[1] = list.get(i).getCandName();
row[2] = list.get(i).getCandSurname();
row[3] = list.get(i).getNationality();
row[4] = list.get(i).getCandEnglish();
row[5] = list.get(i).getCandBangla();
row[6] = list.get(i).getCandBurmese();
row[7] = list.get(i).getCandCommunicative();
row[8] = list.get(i).getCandBasicComp();
row[9] = list.get(i).getCandExperienced();
// row[10] = list.get(i).getDocSuf();
model.addRow((Object[]) row);
}
}
private void CandidateTableMouseClicked(java.awt.event.MouseEvent evt) {
// display selected record to text fields
// Get The Index Of The Selected Row
DefaultTableModel model = (DefaultTableModel) CandidateTable.getModel();
int selectedRow = CandidateTable.getSelectedRow();
candNameBox.setText(model.getValueAt(selectedRow, 1).toString());
candSurnameBox.setText(model.getValueAt(selectedRow, 2).toString());
String nationality = model.getValueAt(selectedRow, 3).toString();
switch(nationality){
case "Chinese":
nationalityBox.setSelectedIndex(0);
break;
case "Indian":
nationalityBox.setSelectedIndex(1);
break;
case "Burmese":
nationalityBox.setSelectedIndex(2);
break;
case "Bangladeshi":
nationalityBox.setSelectedIndex(3);
break;
case "Singaporean":
nationalityBox.setSelectedIndex(4);
break;
case "Malaysian":
nationalityBox.setSelectedIndex(5);
break;
}
boolean english = (boolean) model.getValueAt(selectedRow, 4);
if(english){
engCheckBox.setSelected(true);
}
boolean bangla = (boolean) model.getValueAt(selectedRow, 5);
if(bangla){
bangCheckBox.setSelected(true);
}
boolean burmese = (boolean) model.getValueAt(selectedRow, 6);
if(burmese){
burmeseCheckBox.setSelected(true);
}
boolean communicative = (boolean) model.getValueAt(selectedRow, 7);
if(communicative){
commCheckBox.setSelected(true);
}
boolean bas_comp = (boolean) model.getValueAt(selectedRow, 8);
if(bas_comp){
bascompCheckBox.setSelected(true);
}
boolean exper = (boolean) model.getValueAt(selectedRow, 9);
if(exper){
experCheckBox.setSelected(true);
}
}
// the following method updates the candidate record
private void UpdateRecordButtonActionPerformed(java.awt.event.ActionEvent evt) {
try {
Class.forName(driver);
Connection con = DriverManager.getConnection(url, user, pass);
int row = CandidateTable.getSelectedRow();
String val2 = (CandidateTable.getModel().getValueAt(row, 0).toString());
String sql = "UPDATE CANDIDATEINFORMATION SET CANDIDATE_NAME=?, CANDIDATE_SURNAME=? , NATIONALITY=? , ENGLISH=? , BURMESE=? ,BANGLA=? ,COMMUNICATION=? , BASIC_COMPUTING=?, EXPERIENCE=? where CANDIDATE_ID=" + val2;
PreparedStatement prepStat = con.prepareStatement(sql);
prepStat.setString(1, candNameBox.getText());
prepStat.setString(2, candSurnameBox.getText());
String value = nationalityBox.getSelectedItem().toString();
prepStat.setString(3, value);
prepStat.setBoolean(4, engCheckBox.isSelected());
prepStat.setBoolean(5, bangCheckBox.isSelected());
prepStat.setBoolean(6, burmeseCheckBox.isSelected());
prepStat.setBoolean(7, commCheckBox.isSelected());
prepStat.setBoolean(8, bascompCheckBox.isSelected());
prepStat.setBoolean(9, experCheckBox.isSelected());
prepStat.executeUpdate();
DefaultTableModel model = (DefaultTableModel) CandidateTable.getModel();
model.fireTableDataChanged();
CandidateTable.repaint();
JOptionPane.showMessageDialog(null, "Record updated.");
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
例外
更新并单击记录时，我得到了'ArrayOutOfBoundsException -1'。
另外，在执行时，我收到以下消息：
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
at jobcandidatedatabse_ia.AddCandidateInfo.CandidateTableMouseClicked(AddCandidateInfo.java:529)
at jobcandidatedatabse_ia.AddCandidateInfo.access$600(AddCandidateInfo.java:20)
at jobcandidatedatabse_ia.AddCandidateInfo$7.mouseClicked(AddCandidateInfo.java:226)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:270)
at java.awt.Component.processMouseEvent(Component.java:6536)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4534)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)