我一直在尝试使用从数据库中查询的数据加载TableView，但似乎无法让它工作。
这是我尝试使用数据库查询项填充数据库的第一次尝试，以防我的代码看起来很糟糕且远非好用。
FXML是通过JavaFx SceneBuilder完成的。
这是数据库查询类：
public static void refreshTableApplicant(){
dataApplicant = FXCollections.observableArrayList();
try {
Connection con = Login.getConnection();
Statement stmt = con.createStatement();
if (Login.getEntitlement() < 3) {
ResultSet rs = stmt.executeQuery("Select * from applicant");
while (rs.next()) {
ObservableList<String> applicant = FXCollections.observableArrayList();
applicant.add(rs.getString(1));
applicant.add(rs.getString(5));
applicant.add(rs.getString(6));
applicant.add(rs.getString(8));
applicant.add(rs.getString(9));
applicant.add(rs.getString(10));
applicant.add(rs.getString(11));
applicant.add(rs.getString(13));
applicant.add(rs.getString(14));
applicant.add(rs.getString(16));
applicant.add(rs.getString(19));
applicant.add(rs.getString(7));
applicant.add(rs.getString(20));
dataApplicant.add(applicant);
System.out.println(dataApplicant);
}
}
else {
ResultSet rs = stmt.executeQuery(
"Select * from applicant a inner join relationship r on r.applicantID = a.applicantID inner join vacancy v on v.vacancyID = r.vacancyID where v.divisionID = "
+ Login.getDivisionID());
while (rs.next()) {
ObservableList<String> applicant = FXCollections.observableArrayList();
applicant.add(rs.getString(1));
applicant.add(rs.getString(5));
applicant.add(rs.getString(6));
applicant.add(rs.getString(8));
applicant.add(rs.getString(9));
applicant.add(rs.getString(10));
applicant.add(rs.getString(11));
applicant.add(rs.getString(13));
applicant.add(rs.getString(14));
applicant.add(rs.getString(16));
applicant.add(rs.getString(19));
applicant.add(rs.getString(7));
applicant.add(rs.getString(20));
dataApplicant.add(applicant);
}
}
tableViewApplicant.getItems().addAll(dataApplicant);
} catch (SQLException e) {
System.out.println("MainWindowController - refreshTableApplicant");
e.printStackTrace();
}
}
这是我得到的错误：
[[100002, Doe, John, Mainstreet, 2, 14572, Chicago, 045404245, 156451231, Doe.John@googlemail.com, Manager, 1994-11-24, MIT]]
java.lang.NullPointerException
at trilabfx.GUI.MainWindowController.refreshTableApplicant(MainWindowController.java:114)
at trilabfx.login.Login.login(Login.java:30)
at trilabfx.login.LoginController.btnLoginPressed(LoginController.java:77)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.Node.fireEvent(Unknown Source)
at javafx.scene.control.Button.fire(Unknown Source)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(Unknown Source)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.access$1500(Unknown Source)
at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$350(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$197/522491302.get(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.notifyMouse(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source)
at com.sun.glass.ui.win.WinApplication$$Lambda$36/2117255219.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
这是FXML文件的一部分：
<Tab fx:id="tabApplicant" text="applicant">
<content>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="1080.0" prefWidth="1920.0">
<children>
<HBox layoutX="234.0" layoutY="116.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<TableView fx:id="tableViewApplicant" layoutX="234.0" layoutY="116.0" prefHeight="200.0" prefWidth="200.0" HBox.hgrow="ALWAYS">
<columns>
<TableColumn prefWidth="-1.0" text="applicant-ID" />
<TableColumn prefWidth="-1.0" text="name" />
<TableColumn prefWidth="-1.0" text="firstName" />
<TableColumn prefWidth="-1.0" text="street" />
<TableColumn prefWidth="-1.0" text="houseNr" />
<TableColumn prefWidth="-1.0" text="postalCode" />
<TableColumn prefWidth="-1.0" text="city" />
<TableColumn prefWidth="-1.0" text="telefon home" />
<TableColumn prefWidth="-1.0" text="telefon mobil" />
<TableColumn prefWidth="-1.0" text="e-mail" />
<TableColumn prefWidth="-1.0" text="vacancy" />
<TableColumn prefWidth="-1.0" text="birthday" />
<TableColumn prefWidth="-1.0" text="educationalAchievement" />
</columns>
<columnResizePolicy>
<TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
</columnResizePolicy>
</TableView>
</children>
</HBox>
</children></AnchorPane>
</content>
</Tab>
该方法由Login类访问：
public static int login(String username, String password) {
try {
con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=trilab;user=trilab;password=trilab");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT entitlement, employeeID, divisionID from employee where loginName = '"+ username + "' AND password = '" + password + "'");
while (rs.next()) {
entitlement = rs.getInt(1);
ID = rs.getInt(2);
divisionID = rs.getInt(3);
MainWindowController.refreshTableApplicant();
return entitlement;
}
} catch (Exception e) {
System.out.println("Login - login");
e.printStackTrace();
}
return 0;
}