JavaFX MySQL连接示例，请 [英] JavaFX MySQL connection example please

问题描述

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信息的类的示例.桌子上，搜寻了整个互联网，我没有找到任何直截了当的东西，我不希望有任何花哨的东西只是为了完成工作. 干净而简单的东西.

Can anyone give me one example of a class that connects JavaFX with MySQL, dont want Main class, have one, just want a example of a class that connects any application to a MySQL database and gets a row from that database into a table, searched the whole internet and i didn't find anything straight to the point i do not want anything fancy just something to get the job done please. Something clean and simple.

推荐答案

至少，您需要三个类: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.此示例遵循与 TableView教程

At a minimum, you need three classes: one to represent your data, one for your UI, and one to manage the database connection. In a real app you'd need more than this, of course. This example follows the same basic example as the TableView tutorial

假设您的数据库有一个person表，该表包含三列first_name，last_name，email_address.

Suppose your database has a person table with three columns, 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);
    }

}

用于访问数据库中数据的类:

A class to access the data from the database:

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);
    }
}

(我只是在未经测试的情况下输入了此内容，因此可能会有错别字，缺少输入内容等，但足以让您知道这个主意.)

(I just typed that in without testing, so there may be typos, missing imports, etc, but it should be enough to give you the idea.)

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