使用LINQ连接多个数据库

Question

I am developing an ASP.NET application in which I need to provide support for two databases, MySql and MS SQL Server 2005 and 2008 (one database will be used at a time).

1. How will I configure the ASP.NET app to connect with different databases without reinstalling the app (ie using configuration)?

2. How will I configure LINQ?

3. Shouldn't I use NHibernate?

Answer 1

Use basic Linq to SQL structures (nothing database specific) and by just changing the connection string should do the trick. Linq expression trees are transformed to SQL by Linq enabled drivers (ie they know how to handle the expression tree).

Answer 2

这是更好的方法： Entity Framework的多数据库支持 。