我正在将一个字符串从一个场景传递到另一个场景，两者都在JavaFX中使用不同的控制器，并使用该字符串执行sql语句，但出现“检查与maria DB服务器相对应的手册”的错误。我将放下相关代码。任何帮助，将不胜感激。menu.fxml ----> MenuController.java和orderList.fxml ----> OrderListController.java
FXMLLoader loader = new FXMLLoader(getClass().getResource("orderList.fxml"));
Parent root = loader.load();
OrderListController orderListController = loader.getController();
orderListController.transferMessage(orderRefNo);
Stage orderListStage = new Stage();
orderListStage.setScene(new Scene(root));
orderListStage.show();
public class OrderListController implements Initializable {
private String orderRefNo;
public void transferMessage(String message){
orderRefNo = message;
}
public OrderListController() throws SQLException, ClassNotFoundException {
}
@Override
public void initialize(URL location, ResourceBundle resources) {
try {
//ResultSet resultSet = connection.createStatement().executeQuery("SELECT * FROM "+orderRefNo+"");
PreparedStatement preparedStatement = connection.prepareStatement("SELECT * FROM ?");
preparedStatement.setString(1, orderRefNo);
ResultSet resultSet = preparedStatement.executeQuery();
while (resultSet.next()){
observableList.add(new orderListTableModel(resultSet.getString("ID"), resultSet.getString("FOOD_NAME"), resultSet.getString("QUANTITY"),
resultSet.getString("PRICE")));
}
} catch (SQLException e) {
e.printStackTrace();
}
id_OrderListTableModel.setCellValueFactory(new PropertyValueFactory<>("id"));
food_OrderListTableModel.setCellValueFactory(new PropertyValueFactory<>("foodName"));
quantity_OrderListTableModel.setCellValueFactory(new PropertyValueFactory<>("qty"));
price_OrderListTableModel.setCellValueFactory(new PropertyValueFactory<>("price"));
orderListTableModel.setItems(null);
orderListTableModel.setItems(observableList);
}
}
错误代码
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'null' at line 1
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.Util.getInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:944)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2495)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1903)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2011)
at sample.OrderListController.initialize(OrderListController.java:37)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2573)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
at sample.MenuController.menuBtnClicked(MenuController.java:107)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1782)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1670)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3589)
at javafx.graphics/javafx.scene.Scene$ClickGenerator.access$8300(Scene.java:3517)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3885)
at javafx.graphics/javafx.scene.Scene$MouseHandler.access$1300(Scene.java:3604)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1874)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2613)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:189)
at java.base/java.lang.Thread.run(Thread.java:844)
Process finished with exit code 0
顺便说一下，这是我的orderListTableModel
public class orderListTableModel {
String id, foodName, qty, price;
public orderListTableModel(String id, String foodName, String qty, String price) {
this.id = id;
this.foodName = foodName;
this.qty = qty;
this.price = price;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getFoodName() {
return foodName;
}
public void setFoodName(String foodName) {
this.foodName = foodName;
}
public String getQty() {
return qty;
}
public void setQty(String qty) {
this.qty = qty;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
}
无法使用PreparedStatement将表名称绑定到SQL查询。 PreparedStatement用于列名，而不是表名。我了解到orderRefNo引用一个String对象，但是您在构造查询时仍将其绑定为您的SELECT语句中使用的表。
PreparedStatement preparedStatement = connection.prepareStatement("**SELECT * FROM ?**");
preparedStatement.setString(1, orderRefNo);
了解您在查询中使用String orderRefNo作为表名，这是不允许的。因此，您将获得异常。，因为它会使您的代码容易受到SQL注入攻击的攻击。我重复一遍，不要将表名直接连接到查询中。您可以执行此操作的另一种方法是将表名连接到查询中，但是您应该
永远不要这样做