mysql如何用jdbc连接数据库代码

import java.sql.*;

public class JDBCExample {

    public static void main(String[] args) {
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

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

            // 建立数据库连接
            String url = "jdbc:mysql://localhost:3306/mydatabase";
            String username = "username";
            String password = "password";
            connection = DriverManager.getConnection(url, username, password);

            // 创建Statement对象，用于执行SQL语句
            statement = connection.createStatement();

            // 执行查询语句
            String query = "SELECT * FROM mytable";
            resultSet = statement.executeQuery(query);

            // 处理查询结果
            while (resultSet.next()) {
                String column1 = resultSet.getString("column1");
                int column2 = resultSet.getInt("column2");
                // 其他列类似
                System.out.println(column1 + ", " + column2);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭连接，释放资源
                if (resultSet != null) {
                    resultSet.close();
                }
                if (statement != null) {
                    statement.close();
                }
                if (connection != null) {
                    connection.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}