请推荐一种.Net ORM，它支持运行时模式演化
所有 RDBMS 都支持 ALTER TABLE 命令，该命令允许管理员向表中添加新列，或更改现有列的类型。
我正在.Net ORM 中寻找这样的运行时模式演化函数。我扫描了一些 ORM 框架，但找不到针对这种演变的直观解决方案。最接近的是 OpenAccess (http://www.telerik.com/products /orm/features.aspx#runtime-changes）。在 OpenAccess 中，您可能有人工字段/类型，但您使用不同的方式来访问它们。换句话说，它们与预定义的属性/类不同。这不是我所期望的，并且与 ALTER Table 所做的不同。
BTW，Versant 对象数据库宣布具有 DYNAMIC DATABASE SCHEMA EVOLUTION 功能 (http: //www.versant.com/en_US/products/objectdatabase/index/）。
如果你找到这样的框架，或者你有一些解决方案。请通知我。
先感谢您。
英
All RDBMSs support the ALTER TABLE command, which allows administrators to add new columns to tables, or to change the types of existing columns.
I am looking for such a runtime schema evolution function in .Net ORM. I have scanned a few ORM frameworks, and I cannot find an intuitive solution to such an evolution. The closest is OpenAccess (http://www.telerik.com/products/orm/features.aspx#runtime-changes). In OpenAccess, you may have artificial fields /types, but you use a different way to access them. In other words, they are different from pre-defined properties/classes. This is not I expect and is different from what ALTER Table does.
BTW, Versant Object Database announces that it has the function of DYNAMIC DATABASE SCHEMA EVOLUTION (http://www.versant.com/en_US/products/objectdatabase/index/).
If you find such a framework, or you have some solutions. Please notify me.
Thank you in advance.
Ying
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使用 Telerik OpenAccess ORM，您可以根据您的模型随时更改架构 - 因此，如果您的模型从代表数据库中实际情况的模型更改而来，您只需向数据上下文询问架构更新处理程序即可（通过 API 的入口点）并且它将：
a) 返回代表更新脚本的字符串
b) 您可以随时随地执行返回的脚本
无论如何，请看一下（您可以下载试用版并在试用期间提出支持请求），因为我们也有兴趣进一步开发这项技术。
with Telerik OpenAccess ORM you are able to change the schema on the go, based on your model - so if your model is changed form the one that represents the actual situation in the database, you can just ask the data context for a schema update handler (the entry point via the API) and it will either:
a) return a string representing the update script
b) you can execute the returned script on the go
Anyways, please take a look (you can download a trial and make support requests during the trial period), as we are also interested in developing this technology further.
你看过nhibernate吗？
Have you looked at nhibernate?