值对象如何保存和加载? [英] How value objects are saved and loaded?

问题描述

因为没有值对象的存储库. 如何加载所有值对象?

Since there aren no respositories for value objects. How can I load all value objects?

假设我们正在对博客应用程序进行建模，并且具有此类:

Suppose we are modeling a blog application and we have this classes:

• 发布(实体)
• 注释(值对象)
• 标签(值对象)
• PostsRespository(存储库)

我知道，当我保存新帖子时，其标签将与之一起保存在同一表格中.但是我如何加载所有帖子的所有标签. PostsRespository是否应该有一种加载所有标签的方法? 我通常会这样做，但我想了解其他人的意见

I Know that when I save a new post, its tags are saved with it in the same table. But how could I load all tags of all posts. Should PostsRespository have a method to load all tags? I usually do it, but I want to know others opinions

推荐答案

我正在为这个问题寻找更好的解决方案，而我发现了这篇文章:

I'm looking for a better solution for this question and I found this post:

http://gojko .net/2009/09/30/ddd-and-relational-databases-value-object-dilemma/

这篇文章很好地解释了为什么对价值对象和数据库有很多困惑. 在这里，您是一个非常喜欢我的短语:

This post explain very well why there is a lot of confusion with value objects and databases. Here you are phrase which liked me too much:

• "持久性不是将一切都变成实体的借口."

Gojko Adzic，给我们三种选择来保存我们的价值对象.

Gojko Adzic, give us three alternatives to save our value objects.

这篇关于值对象如何保存和加载?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！