java - Should I use other entity objects or their ids

Question

Which approach is more best practice? I have a database with Products table and Categories table. Product always has its category. Now I am implementing the Product entity class and I do not know if it is better to have an int property "category_id" or object property with Category class. So if the contructor should be:

    public Product(int id, int category_id)

or

    public Product(int id, Category category)

Which of these is better? Or should I use both properties?

thanks for reply

Answer 1

第二个。它更简洁，您可以随时更改类别标识符。

此外，它的类型更安全，因为您无法将一些任意的“int”值传递给第二个参数。您无需考虑哪个“int”负责“id”，哪个负责“category_id”（如果缺少文档）。