ユーザ入力による別のデータベーステーブル内の在庫金額の更新

Question

私のデータベースには、スタッフが新しい注文を入力するために使用できる注文テーブルがあります。この注文テーブルは、在庫データを保持する在庫テーブルにリンクしています。製品テーブル。私は注文を私の注文表に追加することができますが、私は更新する在庫量を得ることができません。これはこれまでの私の方法です。

@FXML 
    public void AddOrder(ActionEvent event) { 


     String orderID= orderBox.getText(); 
     String customerID = customerBox.getText(); 
     String productID = productBox.getText(); 
     String amount = amountBox.getText(); 
     String cost = costBox.getText(); 
     String date = dateBox.getText(); 





     dc = new Database(); 



     try { 
     c = dc.Connect(); 
     query = c.prepareStatement("INSERT INTO ordertable (orderID,customerID,productID,Amount,Cost, Date)VALUES(?,?,?,?,?,?)"); 
     update=c.prepareStatement ("UPDATE inventory set stockAmount ="+amount+" WHERE productID ="+productID+""); 
     query.setString(1, orderID); 
     query.setString(2, customerID); 
     query.setString(3, productID); 
     query.setString(4, amount); 
     query.setString(5, cost); 
     query.setString(6, date); 
     query.executeUpdate(); 
     update.executeUpdate(); 
     Alert confirmation = new Alert(Alert.AlertType.CONFIRMATION, "Saved"); 
     // closeConfirmation.showMessageDialog(this, "Saved"); 
     confirmation.show(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 

    orderBox.clear(); 
    customerBox.clear(); 
    productBox.clear(); 
    amountBox.clear(); 
    costBox.clear(); 
    dateBox.clear(); 

} 

私はあなたが準備された文（query）を混合している

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column '2AAB' in 'where clause' 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) 
    at java.lang.reflect.Constructor.newInstance(Unknown Source) 
    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:943) 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973) 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909) 
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527) 
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680) 
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2501) 
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858) 
    at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2079) 
    at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2013) 
    at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5104) 
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1998) 
    at application.OrderController.AddOrder(OrderController.java:180) 
    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$MethodHandler.invoke(FXMLLoader.java:1769) 
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657) 
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86) 
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) 
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) 
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) 
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) 
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) 
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49) 
    at javafx.event.Event.fireEvent(Event.java:198) 
    at javafx.scene.Node.fireEvent(Node.java:8411) 
    at javafx.scene.control.Button.fire(Button.java:185) 
    at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182) 
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96) 
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89) 
    at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218) 
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) 
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) 
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) 
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) 
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) 
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) 
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) 
    at javafx.event.Event.fireEvent(Event.java:198) 
    at javafx.scene.Scene$MouseHandler.process(Scene.java:3757) 
    at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) 
    at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) 
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416) 
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415) 
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555) 
    at com.sun.glass.ui.View.notifyMouse(View.java:937) 
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191) 
    at java.lang.Thread.run(Unknown Source) 

Answer 1

（2AAB iは入力てるのproductIDあり、そしてそれは私の在庫表内のproductID列の下に存在する）取得していますエラー普通のもの（update）であり、これがあなたのコードで問題になっています。あなたは入力をエスケープしていないし、MySQLはエスケープされていないテキストをカラム名として扱います。動作するはず

：

 
    update=c.prepareStatement ("UPDATE inventory set stockAmount =? WHERE productID =?"); 
    update.setInt(1, amount); 
    update.setString(2, productID);

Answer 2

問題は、あなたがUPDATEクエリでプロダクトIDを引用しなかったことです。しかし、INSERTの場合と同様に、パラメータ化されたクエリを使用する必要があります。

 update=c.prepareStatement ("UPDATE inventory set stockAmount ? WHERE productID = ?"); 
     update.setInt(1, amount); 
     update.setString(2, productID); 
     update.execute(); 

amountが整数ではなく文字列であるため、また、query.setInt(4, amount);を使用する必要があります。