如何將 JavaFX 應用程式連接到 MySQL 資料庫並在 TableView 中顯示資料？

JavaFX MySQL 資料庫連線

將 JavaFX 應用程式連接到 MySQL 資料庫需要一個特定的類別來處理連線和資料擷取。這是一個簡單的範例：

PersonDataAccessor:

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 {

    private Connection connection;

    // Constructor
    public PersonDataAccessor(String driverClassName, String dbURL, String user, String password) throws SQLException, ClassNotFoundException {
        Class.forName(driverClassName);
        connection = DriverManager.getConnection(dbURL, user, password);
    }

    // Close connection
    public void shutdown() throws SQLException {
        if (connection != null) {
            connection.close();
        }
    }

    // Get person list
    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;
        }
    }

}

此類處理連線建立、查詢執行和資料擷取。 getPersonList() 方法查詢資料庫中的「person」表，並將檢索到的資料轉換為 Person 物件清單。

Person 模型（資料表示）：

import javafx.beans.property.StringProperty;
import javafx.beans.property.SimpleStringProperty;

public class Person {

    private StringProperty firstName = new SimpleStringProperty(this, "firstName");
    public StringProperty firstNameProperty() {
        return firstName;
    }
    public String getFirstName() {
        return firstNameProperty().get();
    }
    public void setFirstName(String firstName) {
        firstNameProperty().set(firstName);
    }

    private StringProperty lastName = new SimpleStringProperty(this, "lastName");
    public StringProperty lastNameProperty() {
        return lastName;
    }
    public String getLastName() {
        return lastNameProperty().get();
    }
    public void setLastName(String lastName) {
        lastNameProperty().set(lastName);
    }

    private StringProperty email = new SimpleStringProperty(this, "email");
    public StringProperty emailProperty() {
        return email;
    }
    public String getEmail() {
        return emailProperty().get();
    }
    public void setEmail(String email) {
        emailProperty().set(email);
    }

    public Person() {}

    public Person(String firstName, String lastName, String email) {
        setFirstName(firstName);
        setLastName(lastName);
        setEmail(email);
    }

}

該類別定義了具有名字、姓氏和屬性的Person 物件email.

UI類別（在表格中顯示資料）：

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 DB connection details

        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);
    }
}

此類初始化 UI 並在 TableView 中顯示 Person 物件。

透過執行以下步驟，您可以建立 JavaFX 應用程序，該應用程式成功連接到 MySQL 資料庫、檢索資料並以使用者友好的方式顯示它表。

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