jdbc连接mysql数据库代码

import java.sql.*;

public class MySQLConnectionExample {
    public static void main(String[] args) {
        // 数据库连接信息
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "username";
        String password = "password";

        try {
            // 加载驱动程序
            Class.forName("com.mysql.jdbc.Driver");

            // 建立数据库连接
            Connection connection = DriverManager.getConnection(url, username, password);

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

            // 处理查询结果
            while (resultSet.next()) {
                String column1 = resultSet.getString("column1");
                int column2 = resultSet.getInt("column2");

                System.out.println(column1 + " - " + column2);
            }

            // 关闭连接和释放资源
            resultSet.close();
            statement.close();
            connection.close();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}