如果我使用插入，如何解决“无法为SELECTs发出executeUpdate（）”

Question

我正在使用“插入”，但出现此错误：

  

'java.sql.SQLException：无法发出executeUpdate（）或   SELECT的executeLargeUpdate（）

我知道这个平台是“提问者”。我曾经在这里搜索解决方案，但知道找不到任何可以帮助我的东西。

连接是好的，它以前工作过，所以我认为这不是问题。

    Connection connection = null;
    PreparedStatement preparedStatement = null;
    ResultSet resultSet = null;

    public RegisterAndLogin() {
        connection = ConnectionUtil.connectDB();
    }

出现错误的寄存器在行'preparedStatement.executeUpdate（）;'

public void registerAction(ActionEvent event) {
        String name = txtName.getText().toString();
        String mail = txtEmail.getText().toString();
        String age = txtAge.getValue().toString();
        String password = txtPassword.getText().toString();

        String sql = "INSERT INTO client(name, email, age, password) VALUES(?,?,?,?)";

        try {
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, name);
            preparedStatement.setString(2, mail);
            preparedStatement.setString(3, age);
            preparedStatement.setString(4, password);

            if((name.equals("") || password.equals("") || checkEmail(mail) || (Integer.parseInt(age) < 14)) == true) {
                if(name.equals(""))
                    infoBox("Add an email", null, "Error");
                if(password.equals(""))
                    infoBox("Add a password", null, "Error");
                if(checkEmail(mail) == true)
                    infoBox("This email already exists", null, "Error");
                if(Integer.parseInt(age) < 14)
                    infoBox("You are too young to create an account", null, "Error");
            }
            else {
                **preparedStatement.executeUpdate();**
                infoBox("Congrats, " + name + " you just created your account", null, "Register successful");
                Node node = (Node)event.getSource();
                primaryStage = (Stage)node.getScene().getWindow();
                primaryStage.close();

                scene = new Scene(FXMLLoader.load(getClass().getResource("/fxml/MainView.fxml")));
                primaryStage.setScene(scene);
                primaryStage.show();

            }
        }catch(Exception e) {
            e.printStackTrace();
        }
    }

连接良好，因为登录有效。 登录代码：

public void loginAction(ActionEvent event) throws Exception {

        String email = txtLoginEmail.getText().toString();
        String pass = txtLoginPass.getText().toString();

        String sql = "SELECT * FROM client WHERE email = ? AND password = ?";

        try {
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, email);
            preparedStatement.setString(2, pass);
            resultSet = preparedStatement.executeQuery();

            if(!resultSet.next()) {
                infoBox("Please enter correct Email and Password", null, "Failed");
            }
            else {
                infoBox("Login Successful", null, "Success");
                Node node = (Node)event.getSource();
                primaryStage = (Stage)node.getScene().getWindow();
                primaryStage.close();

                scene = new Scene(FXMLLoader.load(getClass().getResource("/fxml/MainView.fxml")));
                primaryStage.setScene(scene);
                primaryStage.show();

            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

上次我运行该应用程序并创建了一个新的寄存器，它可以运行，并且最近我还没有更改函数registerAction中的任何代码。 如果您能帮助我，我会很高兴，我搜索了此错误，但找不到任何可以帮助我的东西。

java.sql.SQLException: Can not issue executeUpdate() or executeLargeUpdate() for SELECTs
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1090)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1061)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeLargeUpdate(ClientPreparedStatement.java:1381)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdate(ClientPreparedStatement.java:1046)
    at controllers.RegisterAndLogin.registerAction(RegisterAndLogin.java:193)
    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:49)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8865)
    at javafx.controls/javafx.scene.control.Button.fire(Button.java:200)
    at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
    at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3876)
    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:175)
    at java.base/java.lang.Thread.run(Thread.java:844)