提问者:小点点

TableView(JavaFX)填充从观察列表不工作


我试图从数据(ObservableList)中填充tableview2(fx:id tableview)行。但当它完成时,tableview2只显示空记录。在控制台中,我看到数据中的所有行(ObservableList)。我知道stackoverflow中有很多关于这方面的问题,很抱歉(还有我的英语),但请你问我代码中的错误在哪里?感谢您的帮助或关注)。

更新(添加MainPayer.java和更新PayerController.java):这是我的代码。

付款人控制器。java:

public class PayerController {
@FXML
private TableColumn<MainPayer,Long> tablePayerid2;
@FXML
private TableColumn<MainPayer,Long> tableIsAccepted2;
@FXML
private TableColumn<MainPayer,Long> tableYear2;
@FXML
private TableColumn<MainPayer,Long> tableQuater2;
@FXML
private TableColumn<MainPayer,Long> tableEnspeopley2;
@FXML
private TableColumn<MainPayer,String> tableShortName2;
@FXML
private TableColumn<MainPayer,String> tableDistrict2;
@FXML
private TableColumn<MainPayer,String> tableSettlement2;
@FXML
private TableColumn<MainPayer,String> tableStreet2;
@FXML
private TableColumn<MainPayer,String> tableHouseNum2;
@FXML
private TableColumn<MainPayer,String> tableMailIndex2;
@FXML
private TableView<MainPayer> tableview2;
private ObservableList<MainPayer> data;

@FXML
    private void handleRunMainQuery() throws SQLException {

        Connection dbConnection = null;
        Statement statement = null;

        String selectTableSQL = "SELECT        F.PAYERID, F.ISACCEPTED, F.RYEAR, F.QUATER, F.ENSPEOPLEY, S.CSHORTNAME, T.DISTRICT, T.SETTLEMENT, T.STREETNAME, T.HOUSENUM, \n" +
                "                         T.MAILINDEX\n" +
                "FROM            FFUNDSIDE F, FPAYER S, FLOCATIONHISTORY T,\n" +
                "                             (SELECT        PAYERID, MAX(LADATE) AS LADATE\n" +
                "                               FROM            FLOCATIONHISTORY\n" +
                "                               GROUP BY PAYERID) X\n" +
                "WHERE        F.PAYERID = S.PAYERID AND S.PAYERID = T.PAYERID AND T.PAYERID = X.PAYERID AND T.LADATE = X.LADATE AND (F.PAYERID BETWEEN \n" +
                "                         400000000 AND 499999999) AND (F.RYEAR = 2018) AND (F.QUATER = 3) AND (F.ENSPEOPLEY > 10)";

        data = FXCollections.observableArrayList();
        try {
            dbConnection = getDBConnection();
            statement = dbConnection.createStatement();

            ResultSet rs = statement.executeQuery(selectTableSQL);


            tablePayerid2.setCellValueFactory(data -> data.getValue().payerid2Property().asObject());
        tableIsAccepted2.setCellValueFactory(data -> data.getValue().isAccepted2Property().asObject());
        tableYear2.setCellValueFactory(data -> data.getValue().year2Property().asObject());
        tableQuater2.setCellValueFactory(data -> data.getValue().quater2Property().asObject());
        tableEnspeopley2.setCellValueFactory(data -> data.getValue().enspeopley2Property().asObject());
        tableShortName2.setCellValueFactory(data -> data.getValue().shortName2Property());
        tableDistrict2.setCellValueFactory(data -> data.getValue().district2Property());
        tableSettlement2.setCellValueFactory(data -> data.getValue().settlement2Property());
        tableStreet2.setCellValueFactory(data -> data.getValue().street2Property());
        tableHouseNum2.setCellValueFactory(data -> data.getValue().houseNum2Property());
        tableMailIndex2.setCellValueFactory(data -> data.getValue().mailIndex2Property());

            while (rs.next()) {
            ObservableList<MainPayer> row = FXCollections.observableArrayList();
            data.add(new MainPayer(rs.getLong(1),rs.getLong(2),rs.getLong(3),rs.getLong(4),rs.getLong(5),
                    rs.getString(6),rs.getString(7),rs.getString(8),rs.getString(9),rs.getString(10),
                    rs.getString(11)));
        }

            tableview2.setItems(data);
        } catch (SQLException e) {
            System.out.println(e.getMessage());
        } finally {
            if (statement != null) {
                statement.close();
            }
            if (dbConnection != null) {
                dbConnection.close();
            }
        }
}

主要付款人。Java语言

public class MainPayer {
private final LongProperty payerid2;
    private final LongProperty isAccepted2;
    private final LongProperty year2;
    private final LongProperty quater2;
    private final LongProperty enspeopley2;
    private final StringProperty shortName2;
    private final StringProperty district2;
    private final StringProperty settlement2;
    private final StringProperty street2;
    private final StringProperty houseNum2;
    private final StringProperty mailIndex2;

public MainPayer(Long payerid2, Long isAccepted2, Long year2, Long quater2, Long enspeopley2, String shortName2, String district2,
                 String settlement2, String street2, String houseNum2, String mailIndex2) {
    this.payerid2 = new SimpleLongProperty(payerid2);
    this.isAccepted2 = new SimpleLongProperty(isAccepted2);
    this.year2 = new SimpleLongProperty(year2);
    this.quater2 = new SimpleLongProperty(quater2);
    this.enspeopley2 = new SimpleLongProperty(enspeopley2);
    this.shortName2 = new SimpleStringProperty(shortName2);
    this.district2 = new SimpleStringProperty(district2);
    this.settlement2 = new SimpleStringProperty(settlement2);
    this.street2 = new SimpleStringProperty(street2);
    this.houseNum2 = new SimpleStringProperty(houseNum2);
    this.mailIndex2 = new SimpleStringProperty(mailIndex2);
}

public LongProperty payerid2Property() {
    return payerid2;
}
public LongProperty isAccepted2Property() {
    return isAccepted2;
}
public LongProperty year2Property() {
    return year2;
}
public LongProperty quater2Property() {
    return quater2;
}
public LongProperty enspeopley2Property() {
    return enspeopley2;
}
public StringProperty shortName2Property() {
    return shortName2;
}
public StringProperty district2Property() {
    return district2;
}
public StringProperty settlement2Property() {
    return settlement2;
}
public StringProperty street2Property() {
    return street2;
}
public StringProperty houseNum2Property() {
    return houseNum2;
}
public StringProperty mailIndex2Property() {
    return mailIndex2;
}
}

主场景。fxml

<TableView fx:id="tableview2" layoutX="210.0" layoutY="72.0" prefHeight="345.0" prefWidth="981.0">
                                    <placeholder>
                                        <Label text="Go ahead" />
                                    </placeholder>
                                    <columns>
                                        <TableColumn fx:id="tablePayerid2" minWidth="20.0" prefWidth="104.0" text="A" />
                                        <TableColumn fx:id="tableIsAccepted2" minWidth="40.0" prefWidth="74.0" text="B" />
                                        <TableColumn fx:id="tableYear2" minWidth="1.0" prefWidth="75.0" text="C" />
                                        <TableColumn fx:id="tableQuater2" minWidth="1.0" prefWidth="75.0" text="D" />
                                        <TableColumn fx:id="tableEnspeopley2" minWidth="15.0" prefWidth="75.0" text="E" />
                                        <TableColumn fx:id="tableShortName2" minWidth="15.0" prefWidth="75.0" text="F" />
                                        <TableColumn fx:id="tableDistrict2" prefWidth="75.0" text="J" />
                                        <TableColumn fx:id="tableSettlement2" prefWidth="75.0" text="K" />
                                        <TableColumn fx:id="tableStreet2" prefWidth="111.0" text="L" />
                                        <TableColumn fx:id="tableHouseNum2" minWidth="1.0" prefWidth="67.0" text="M" />
                                        <TableColumn fx:id="tableMailIndex2" minWidth="2.0" prefWidth="58.0" text="N" />
                                    </columns>
                                    <columnResizePolicy>
                                        <TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
                                    </columnResizePolicy>
                                </TableView>

共1个答案

匿名用户

你面临着一些问题。首先,您应该了解JavaFx中TableView的基本概念。与其链接教程,不如指出您遗漏了什么,以及如何解决这些问题。

简单地解释一下TableView有两个“部分”,一个是您可以看到的UI部分,其中包含列、标头、行等。另一边是填充表的模型。一旦您创建了UI,您必须为表分配一个模型,以将预期的数据添加到表中。

在表格视图中,行不是项目列表,而是模型的实例,每个列都有字段。(当然,它可以是一个列表,但对你来说,它让事情变得更加复杂)

有几个步骤,如果你尊重你可以得到预期的结果:

>

  • 创建一个calass作为表示您拥有的数据的模型。在您的例子中,我看到有一个用户或从DB加载的东西,所以您可能可以创建一个包含要从DB加载的字段的类,如palayerId、isAccepted、year等等。每个字段都应该是与其类型相对应的属性,如果是String,则应该是StringProperty,如果是long,则应该是LongProperty,依此类推
  • 将此模型作为泛型传递给表视图,就像您所做的那样:private TableView tableView2-

    因此,表中的每一行都是用户的一个实例,您可以像您所尝试的那样,在ObservableList中定义整个表数据,ObservableList

    假设您有一个带有字符串的列:

    @FXML
    private TableColumn<User,String> colWithString;
    

    然后你可以这样说:

    colWithString.setCellValueFactory(data -> data.getValue().myStringProperty());
    

    当然,您可以在需要的地方放置适当的属性,而不是myStringProperty。

    就是这样,如果您遵守这些步骤并相应地修改,那么应该显示来自DB的数据。

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