mysql数据库连接的实现

Class.forName("com.mysql.jdbc.Driver");

String url = "jdbc:mysql://localhost:3306/mydatabase";
String username = "myusername";
String password = "mypassword";
Connection connection = DriverManager.getConnection(url, username, password);

Statement statement = connection.createStatement();
String sql = "SELECT * FROM mytable";
ResultSet resultSet = statement.executeQuery(sql);

resultSet.close();
statement.close();
connection.close();

import java.sql.*;

public class MySQLConnectionExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "myusername";
        String password = "mypassword";

        try {
            // 加载驱动程序
            Class.forName("com.mysql.jdbc.Driver");
            
            // 建立连接
            Connection connection = DriverManager.getConnection(url, username, password);

            // 执行SQL语句
            Statement statement = connection.createStatement();
            String sql = "SELECT * FROM mytable";
            ResultSet resultSet = statement.executeQuery(sql);

            // 处理结果
            while (resultSet.next()) {
                // 读取数据
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                System.out.println("ID: " + id + ", Name: " + name);
            }

            // 关闭连接
            resultSet.close();
            statement.close();
            connection.close();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}