Question

我有一些问题试图找出为什么一旦从阅读器中检测到另一个RFID标签，该值就会从Tableview覆盖到同一个表行和列。

我想要的是确保每个数据都能显示下一个可用的行，看起来我无法解决问题。我希望你们能帮忙。感谢

这是我对表的声明

public class tableview extends Application implements Initializable {

    @FXML
    private TableView<UserDetails> table;
    @FXML
    private TableColumn<UserDetails, String> epc;
    @FXML
    private TableColumn<UserDetails, String> modCode;
    @FXML
    private TableColumn<UserDetails, String> modClass;
    @FXML
    private TableColumn<UserDetails, String> modName;
    @FXML
    private TableColumn<UserDetails, String> timestamp;




    public void initialize(URL location, ResourceBundle resources) {

        epc.setCellValueFactory(new PropertyValueFactory<>("epcNo"));
        modCode.setCellValueFactory(new PropertyValueFactory<>("moduleCode"));
        modClass.setCellValueFactory(new PropertyValueFactory<>("moduleClass"));
        modName.setCellValueFactory(new PropertyValueFactory<>("moduleName"));
        timestamp.setCellValueFactory(new PropertyValueFactory<>("timestamp"));

public synchronized void moduleInfo(String epcString) {
        try {
            conn = db.getConnection();
            int i = 0;
            ResultSet rs = conn.createStatement()
                    .executeQuery("SELECT * FROM module_info_table where rfid_tag_id = " + epcString);

            while (rs.next()) {
                String modulecode = rs.getString("module1_code");
                String moduleclass = rs.getString("module_class");
                String modulename = rs.getString("module1_name");
                String epc = rs.getString("rfid_tag_id");
                String timestamp = rs.getString("last_updated");

                System.out.println(modulecode);
                if (epcString.equals(epc)) {
                    data2 = FXCollections.observableArrayList();
                    data2.add(new UserDetails(epc, modulecode, moduleclass, modulename, timestamp));
                }
            }
            table.setItems(data2);
            table.refresh();

            db.closeConn();
        } catch (Exception e) {
            System.out.println(e);

        }

    }
public class PrintListener implements ReadListener {
    @Override
    public void tagRead(Reader r, TagReadData tr) {

        try {

            String epcString = tr.getTag().epcString();

            if (!map.containsKey(epcString)) {


                moduleInfo(epcString); < -- call to here


            }
            table.setItems(data);
            table.refresh();

        } catch (Exception e) {
            System.out.println(e);
        }
    }

}

这是我的桌面视图：

RFID TAG：45

   EPC     Module Code   Module Class      Module Name         TimeStamp
   45      ET123       DCPE/FT/5D        Computer System     Mon Oct 4 01:13:23am
   -         -              -                  -                   -
   -         -              -                  -                   -

新RFID标签：100（它将覆盖以前的记录）

   EPC     Module Code   Module Class      Module Name         TimeStamp
   100      ET468       DEEE/FT/8G       Computer Science     Mon Oct 4 01:13:23am
    -         -              -                  -                   -
    -         -              -                  -                   -

如下图所示：检测到第一个RFID标签，一旦与mysql数据库匹配，它将显示内容

在检测到新的RFID标签后，最新的RFID标签覆盖了我不希望发生的旧记录。

请注意，tableview有许多列和行没有显示属性，因为我不得不裁剪掉了很多空间。

Answer 1

你在这里覆盖数据2：

data2 = FXCollections.observableArrayList();

将其删除并将其放在此处

public synchronized void moduleInfo(String epcString) {
    try {
        data2 = FXCollections.observableArrayList();
        conn = db.getConnection();
        int i = 0;
        ResultSet rs = conn.createStatement()
                .executeQuery("SELECT * FROM module_info_table where rfid_tag_id = " + epcString);

        while (rs.next()) {
            String modulecode = rs.getString("module1_code");
            String moduleclass = rs.getString("module_class");
            String modulename = rs.getString("module1_name");
            String epc = rs.getString("rfid_tag_id");
            String timestamp = rs.getString("last_updated");

            System.out.println(modulecode);
            if (epcString.equals(epc)) {

                data2.add(new UserDetails(epc, modulecode, moduleclass, modulename, timestamp));
            }
        }
        table.setItems(data2);
        table.refresh();

        db.closeConn();
    } catch (Exception e) {
        System.out.println(e);

    }

现在如果我不是盲目的话，它应该被修复：P

Answer 2

  public void initialize(URL location, ResourceBundle resources) {

    data2 = FXCollections.observableArrayList();

        epc.setCellValueFactory(new PropertyValueFactory<>("epcNo"));
        modCode.setCellValueFactory(new PropertyValueFactory<>("moduleCode"));
        modClass.setCellValueFactory(new PropertyValueFactory<>("moduleClass"));
        modName.setCellValueFactory(new PropertyValueFactory<>("moduleName"));
        timestamp.setCellValueFactory(new PropertyValueFactory<>("timestamp"));

我已经测试过将observablelist放在这里并且它有效！现在我知道data2必须在while（（rs.next））循环

之前声明

Tableview java显示下一行数据库

2 个答案: