如何在Oracle JDBC中使用参数？

String sql = "SELECT * FROM users WHERE age > ?";
PreparedStatement statement = connection.prepareStatement(sql);

statement.setInt(1, 30);

ResultSet resultSet = statement.executeQuery();

try {
    // 创建连接
    Connection connection = DriverManager.getConnection(url, username, password);

    // 创建PreparedStatement对象
    String sql = "SELECT * FROM users WHERE age > ?";
    PreparedStatement statement = connection.prepareStatement(sql);

    // 设置参数值
    statement.setInt(1, 30);

    // 执行查询操作
    ResultSet resultSet = statement.executeQuery();

    // 处理结果集
    while (resultSet.next()) {
        // 获取数据
        int id = resultSet.getInt("id");
        String name = resultSet.getString("name");
        int age = resultSet.getInt("age");

        // 处理数据
        System.out.println("ID: " + id + ", Name: " + name + ", Age: " + age);
    }

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