我有一個MySQL數據庫,其中包含我想要在我的java程序中填充到JList中的數據。我有兩個JList,一個填寫事件標題,另一個填寫客人姓名。如何使用另一個JList中的數據填充JList
我想要的是,當用戶點擊任何活動標題時,第二個JList將顯示屬於該活動的所有訪客姓名。
我已經成功地使用所有事件標題填充第一個JList。我遇到的問題是當用戶點擊活動標題時,嘉賓姓名將在第二個JList上顯示兩次。我怎樣才能讓它只顯示一次?
這是我走到這一步......
的Java類
private JList getJListEvents() {
if (jListEvents == null) {
jListEvents = new JList();
Border border = BorderFactory.createTitledBorder(BorderFactory.createBevelBorder(1, Color.black, Color.black), "Events", TitledBorder.LEFT, TitledBorder.TOP);
jListEvents.setBorder(border);
jListEvents.setModel(new DefaultListModel());
jListEvents.setBounds(new Rectangle(15, 60, 361, 421));
Events lEvents = new Events();
lEvents.loadEvents(jListEvents);
jListEvents.addListSelectionListener(new ListSelectionListener(){
public void valueChanged(ListSelectionEvent e){
EventC eventC = new EventC();
//eventC.MonitorRegDetailsInfo(jListEvents, jTextFieldEventName, jTextFieldEventVenue, jTextFieldEventDate, jTextFieldEventTime, jTextAreaEventDesc);
//eventC.MonitorRegPackageInfo(jListEvents, jTextFieldBallroom, jTextFieldBallroomPrice, jTextFieldMeal, jTextFieldMealPrice, jTextFieldEntertainment, jTextFieldEntertainmentPrice);
eventC.MonitorRegGuest(jListEvents, jListGuest);
}
});
}
return jListEvents;
}
控制器類
public void MonitorRegGuest(JList l, JList l2){
String event = l.getSelectedValue().toString();
Events retrieveGuest = new Events(event);
retrieveGuest.loadGuests(l2);
}
類的所有SQL語句
public void loadGuests(JList l){
ResultSet rs = null;
ResultSet rs2 = null;
ResultSet rs3 = null;
MySQLController db = new MySQLController();
db.getConnection();
String sqlQuery = "SELECT MemberID FROM event WHERE EventName = '" + EventName + "'";
try {
rs = db.readRequest(sqlQuery);
while(rs.next()){
MemberID = rs.getString("MemberID");
}
} catch (SQLException e) {
e.printStackTrace();
}
String sqlQuery2 = "SELECT GuestListID FROM guestlist WHERE MemberID = '" + MemberID + "'";
try {
rs2 = db.readRequest(sqlQuery2);
while(rs2.next()){
GuestListID = rs2.getString("GuestListID");
}
} catch (SQLException e) {
e.printStackTrace();
}
String sqlQuery3 = "SELECT Name FROM guestcontact WHERE GuestListID = '" + GuestListID + "'";
try {
rs3 = db.readRequest(sqlQuery3);
while(rs3.next()){
((DefaultListModel)l.getModel()).addElement(rs3.getString("Name"));
}
} catch (SQLException e) {
e.printStackTrace();
}
db.terminate();
}
謝謝提前!