Question

我正在尝试将javafx应用程序连接到mysql数据库。有一个名为保存的按钮，

其中

同样将标题，ISBN，作者和发布者保存到数据库中。

Mysql连接器版本为2.0.14

    @FXML
private void savebutton(ActionEvent event) {
    try {
        String url = "jdbc:mysql://localhost:3306/librarymanager";
        String uname="root";
        String pass="";
        String query="INSERT INTO `bookdetails`(`title`, `isbn`, `author`, `publisher`, `isavailable`) VALUES ("+title.getText()+","+isbn.getText()+","+author.getText()+","+publisher.getText()+","+Boolean.TRUE+")";
        Class.forName("org.gjt.mm.mysql.Driver");
        Connection con=DriverManager.getConnection(url, uname, pass);
        Statement st=con.createStatement();
        st.executeUpdate(query);
        st.close();
        con.close();
    } catch (ClassNotFoundException |SQLException ex) {
       System.out.println(ex);
    }
}

这是按下保存按钮时调用的功能。

完整的控制器类是...

公共类FXMLDocumentController实现可初始化的{

private Label label;
@FXML
private JFXButton save;
@FXML
private JFXButton cancel;
@FXML
private JFXTextField title;
@FXML
private JFXTextField isbn;
@FXML
private JFXTextField author;
@FXML
private JFXTextField publisher;



@Override
public void initialize(URL url, ResourceBundle rb) {
   
    RequiredFieldValidator fortitle=new RequiredFieldValidator();
    RequiredFieldValidator forisbn=new RequiredFieldValidator();
    title.getValidators().add(fortitle);
    title.focusedProperty().addListener((ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) -> {
        if(!newValue){
            fortitle.setMessage("Enter the title");
            title.validate();
        }
    });
    isbn.getValidators().add(forisbn);
    isbn.focusedProperty().addListener((ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) -> {
        if(!newValue){
            forisbn.setMessage("Enter ISBN");
            isbn.validate();
        }
    });
}    

@FXML
private void savebutton(ActionEvent event) {
    try {
        String url = "jdbc:mysql://localhost:3306/librarymanager";
        String uname="root";
        String pass="";
        String query="INSERT INTO `bookdetails`(`title`, `isbn`, `author`, `publisher`, `isavailable`) VALUES ("+title.getText()+","+isbn.getText()+","+author.getText()+","+publisher.getText()+","+Boolean.TRUE+")";
        Class.forName("org.gjt.mm.mysql.Driver");
        Connection con=DriverManager.getConnection(url, uname, pass);
        Statement st=con.createStatement();
        st.executeUpdate(query);
        st.close();
        con.close();
    } catch (ClassNotFoundException |SQLException ex) {
       System.out.println(ex);
    }
}

@FXML
private void cancelbutton(ActionEvent event) {
       Button btn=(Button)event.getSource();
       Stage stage =(Stage)btn.getScene().getWindow();
       stage.close();
}

Netbeans IDE的错误-无法连接到localhost：3306上的MySQL服务器。 （java.lang.NumberFormatException）。我知道此错误已在以前询问过，但我没有做过类似该代码的错误。我从xaamp启动服务器，启动时没有任何问题。我可以在浏览器中打开localhost：8080 / phpmyadmin/。

我无法指出可能的问题，请您帮我。

Answer 1

只是查询错误。

代替

String query="INSERT INTO `bookdetails`(`title`, `isbn`, `author`, `publisher`, `isavailable`) VALUES ("+title.getText()+","+isbn.getText()+","+author.getText()+","+publisher.getText()+","+Boolean.TRUE+")";

我用过

 String query="insert into bookdetails values (?, ?, ?, ?, ?)";
 PreparedStatement st=con.prepareStatement(query);
                st.setString(1, title.getText());
                st.setString(2, isbn.getText());
                st.setString(3, author.getText());
                st.setString(4, publisher.getText());
                st.setBoolean(5, true);
                st.executeUpdate();
                st.close();

无论如何，它可能会帮助像我这样的人。

无法将javafx应用程序连接到mysql数据库

1 个答案: