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我有三個文件，TopicData，TopicView，TopicTableModel。我的程序使用數據庫中的值顯示一個表。現在，當我點擊一行時，行的索引被打印出來。 我想修改代碼，以便打印來自我的數據庫的topicID。 topicID的值存儲在ArrayList中，但未顯示在表中，因此我無法使用JTable.getValueAt（）。JTable：選擇一行時從數據庫中獲取值
請告訴我如何修改我的代碼。提前致謝。
的更多信息：
TopicData從一個ArrayList數據庫並存儲它需要的數據。
然後將ArrayList傳遞給TopicTableModel，使數據適合在JTable中顯示。
TopicView創建一個JTable並接受TopicTableModel來生成JTable。
TopicData.java
public class TopicData {
int id;
String name;
String date;
String category;
String user;
public TopicData(){
}
public TopicData(int id, String name, String date, String category, String user) {
this.id = id;
this.name = name;
this.date = date;
this.category = category;
this.user = user;
}
public TopicData(String name, String date, String category, String user) {
this.name = name;
this.date = date;
this.category = category;
this.user = user;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public ArrayList<TopicData> getTopicList(){
ArrayList<TopicData> topicList = new ArrayList<TopicData>();
ResultSet rs = null;
DBController db = new DBController();
db.setUp("myDatabase");
String dbQuery = "SELECT topicID, topicName, topicDate, topicCategory, topicUser FROM topicTable ORDER BY topicDate";
rs = db.readRequest(dbQuery);
try{
while(rs.next()){
int id = rs.getInt("topicID");
String name = rs.getString("topicName");
String date = rs.getString("topicDate") ;
String category = rs.getString("topicCategory");
String user = rs.getString("topicUser");
TopicData topic = new TopicData (id, name, date, category, user);
topicList.add(topic);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
db.terminate();
return topicList;
}
TopicTableModel.java
public class TopicTableModel extends AbstractTableModel {
private static final long serialVersionUID = 1L;
private int rowCount, colCount;
private String[] columnNames = {"Name", "Date", "User"};
private Object [][] data;
public TopicTableModel(ArrayList<TopicData> listOfObjects) {
rowCount = listOfObjects.size();
colCount = columnNames.length;
data = new Object[rowCount][colCount];
for (int i = 0; i < rowCount; i++) {
//Copy an ArrayList element to an instance of MyObject
TopicData topic = (listOfObjects.get(i));
data[i][0] = topic.getName();
data[i][1] = topic.getDate();
data[i][2] = topic.getUser();
}
}
@Override
public int getColumnCount() {
// TODO Auto-generated method stub
return colCount;
}
@Override
public int getRowCount() {
// TODO Auto-generated method stub
return rowCount;
}
@Override
public String getColumnName(int col) {
return columnNames[col];
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
// TODO Auto-generated method stub
return data[rowIndex][columnIndex];
}
@Override
public boolean isCellEditable(int rowIndex, int colIndex) {
return false; //Disallow the editing of any cell
}
}
TopicView.java
private JTable getTable() {
if (table == null) {
TopicData topic= new TopicData();
TopicTableModel tableModel = new TopicTableModel(topic.getTopicList());
table = new JTable(tableModel);
table.setShowGrid(false);
table.setFillsViewportHeight(true);
table.setBounds(173, 87, 456, 263);
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
table.getTableHeader().setReorderingAllowed(false);
table.getTableHeader().setResizingAllowed(false);
table.getColumnModel().getColumn(0).setPreferredWidth(500);
ListSelectionModel rowSM = table.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
//Ignore extra messages.
if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No rows are selected.");
}
else {
int selectedRow = lsm.getMinSelectionIndex();
System.out.println("Row " + selectedRow + " is now selected.");
}
}
});
}
return table;
}
我認爲AmuletxHeart想要打印的ID在println語句，在TopicView.java，而不是你做了添加ID列表。 – rob
我剛剛使用這個並刪除「return data.getId（）;」。我現在可以從數據庫中獲取ID，而不必在桌面上顯示ID。謝謝。 – AmuletxHeart
這個答案仍然不正確，因爲它增加了另一列而不是解決問題中提出的問題。 – rob