JavaFX MySQL连接示例请

Z时代
2024-01-10
分类：问答

任何人都可以给我一个将JavaFX与MySQL连接的类的示例，不希望Main类，只有一个，仅需要一个将任何应用程序连接至MySQL数据库并从该数据库中获取一行到表中的类的示例，进行搜索整个互联网，我什么都找不到，我不想要任何花哨的东西只是为了完成工作。干净简单的东西。

回答：

至少需要三个类：一个用于表示数据，一个用于UI，以及一个用于管理数据库连接。当然，在真正的应用程序中，您将需要的还不止这些。本示例遵循与教程相同的基本示例TableView

假设你的数据库有一个person三列的表，first_name，last_name，email_address。

然后，您将编写一个Person类：

import javafx.beans.property.StringProperty ;
import javafx.beans.property.SimpleStringProperty ;
public class Person {
    private final StringProperty firstName = new SimpleStringProperty(this, "firstName");
    public StringProperty firstNameProperty() {
        return firstName ;
    }
    public final String getFirstName() {
        return firstNameProperty().get();
    }
    public final void setFirstName(String firstName) {
        firstNameProperty().set(firstName);
    }
    private final StringProperty lastName = new SimpleStringProperty(this, "lastName");
    public StringProperty lastNameProperty() {
        return lastName ;
    }
    public final String getLastName() {
        return lastNameProperty().get();
    }
    public final void setLastName(String lastName) {
        lastNameProperty().set(lastName);
    }
    private final StringProperty email = new SimpleStringProperty(this, "email");
    public StringProperty emailProperty() {
        return email ;
    }
    public final String getEmail() {
        return emailProperty().get();
    }
    public final void setEmail(String email) {
        emailProperty().set(email);
    }
    public Person() {}
    public Person(String firstName, String lastName, String email) {
        setFirstName(firstName);
        setLastName(lastName);
        setEmail(email);
    }
}

用于从数据库访问数据的类：

import java.sql.Connection ;
import java.sql.DriverManager ;
import java.sql.SQLException ;
import java.sql.Statement ;
import java.sql.ResultSet ;
import java.util.List ;
import java.util.ArrayList ;
public class PersonDataAccessor {
    // in real life, use a connection pool....
    private Connection connection ;
    public PersonDataAccessor(String driverClassName, String dbURL, String user, String password) throws SQLException, ClassNotFoundException {
        Class.forName(driverClassName);
        connection = DriverManager.getConnection(dbURL, user, password);
    }
    public void shutdown() throws SQLException {
        if (connection != null) {
            connection.close();
        }
    }
    public List<Person> getPersonList() throws SQLException {
        try (
            Statement stmnt = connection.createStatement();
            ResultSet rs = stmnt.executeQuery("select * from person");
        ){
            List<Person> personList = new ArrayList<>();
            while (rs.next()) {
                String firstName = rs.getString("first_name");
                String lastName = rs.getString("last_name");
                String email = rs.getString("email_address");
                Person person = new Person(firstName, lastName, email);
                personList.add(person);
            }
            return personList ;
        } 
    }
    // other methods, eg. addPerson(...) etc
}

然后是一个UI类：

import javafx.application.Application ;
import javafx.scene.control.TableView ;
import javafx.scene.control.TableColumn ;
import javafx.scene.control.cell.PropertyValueFactory ;
import javafx.scene.layout.BorderPane ;
import javafx.scene.Scene ;
import javafx.stage.Stage ;
public class PersonTableApp extends Application {
    private PersonDataAccessor dataAccessor ;
    @Override
    public void start(Stage primaryStage) throws Exception {
        dataAccessor = new PersonDataAccessor(...); // provide driverName, dbURL, user, password...
        TableView<Person> personTable = new TableView<>();
        TableColumn<Person, String> firstNameCol = new TableColumn<>("First Name");
        firstNameCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
        TableColumn<Person, String> lastNameCol = new TableColumn<>("Last Name");
        lastNameCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
        TableColumn<Person, String> emailCol = new TableColumn<>("Email");
        emailCol.setCellValueFactory(new PropertyValueFactory<>("email"));
        personTable.getColumns().addAll(firstNameCol, lastNameCol, emailCol);
        personTable.getItems().addAll(dataAccessor.getPersonList());
        BorderPane root = new BorderPane();
        root.setCenter(personTable);
        Scene scene = new Scene(root, 600, 400);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    @Override
    public void stop() throws Exception {
        if (dataAccessor != null) {
            dataAccessor.shutdown();
        }
    }
    public static void main(String[] args) {
        launch(args);
    }
}