我正试图从数据库访问数据并在点击按钮时在jTable中显示它。但我的桌子上没有按下按钮。我已经完成了在stackOverflow中将所有行添加到表格问题中，但没有任何帮助。在这里我粘贴我的按钮的actionListener-
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
java.util.Date utildate = jDateChooser1.getDate();
java.sql.Date date = new java.sql.Date(utildate.getTime());
//System.out.println(date);
String dbURL = "jdbc:derby://localhost:1527/contact;user=nbuser;password=nbuser";
Connection conn = null;
Statement stmt = null;
try
{
Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();;
//Get a connection
conn = DriverManager.getConnection(dbURL);
stmt = conn.createStatement();
//System.out.println(id);
ResultSet result = stmt.executeQuery("select ID, NAME from EMPLOYEE ORDER BY ID ");
ArrayList<String> id = new ArrayList<String>();
ArrayList<String> name = new ArrayList<String>();
Map<String, String> present = new HashMap<String, String>();
while(result.next()){
id.add(result.getString("id"));
name.add(result.getString("name"));
present.put(result.getString("id"), "A");
}
result = stmt.executeQuery("select ID from ATTENDANCE where DATE = '" + date +"'");
while(result.next()){
present.replace(result.getString("id"), "P");
}
DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
model.setColumnIdentifiers(new String[] { "Id", "Name","Attendance"});
for(int i = 0; i < id.size(); i++){
System.out.println(id.get(i)+" "+ name.get(i)+ " "+ present.get(id.get(i)));
model.addRow(new String[]{id.get(i), name.get(i), present.get(id.get(i))});
model.fireTableRowsInserted(1, i+1);
}
jTable1.setModel(model);
}
catch (Exception except)
{
except.printStackTrace();
}
}