java项目连入mysql数据库

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DatabaseConnector {
    public static Connection getConnection() {
        Connection connection = null;
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "root";
        String password = "password";

        try {
            connection = DriverManager.getConnection(url, username, password);
            System.out.println("Database connected successfully!");
        } catch (SQLException e) {
            System.out.println("Database connection failed.");
            e.printStackTrace();
        }

        return connection;
    }
}

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DatabaseOperation {
    public static void main(String[] args) {
        Connection connection = DatabaseConnector.getConnection();
        if (connection != null) {
            try {
                String sql = "SELECT * FROM users";
                PreparedStatement statement = connection.prepareStatement(sql);
                ResultSet resultSet = statement.executeQuery();
                while (resultSet.next()) {
                    int id = resultSet.getInt("id");
                    String name = resultSet.getString("name");
                    System.out.println("User: " + id + " - " + name);
                }
                resultSet.close();
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
                try {
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}