使用实体框架4执行包含复杂选择连接的自定义SQL

Question

My application currently uses ado.net to access the database.

It allows users to configure dashboards by passing custom sql. The custom sql includes joins on multiple tables and the columns of every table are included in the result.

We are migrating from ado.net to entity framework 4.

How do I execute the same queries using entity framework?

Also other code in the application requires firing custom complex join queries on the database. This is done by developers.

Answer 1

Yes you can use inline queries and even stored procedue in entityframework

see example for query http://msdn.microsoft.com/en-us/library/bb738451

see example for stored procedure http://msdn.microsoft.com/en-us/library/bb896334.aspx

Answer 2

If you have dynamic queries you cannot execute them through EF. EF works in strongly typed manner so it expects that you created the type with correct properties (with correct types) at design time (you can create the type at runtime as well but it requires you to create dynamic assembly, emit IL, etc.).

Use your old approach for this type of queries.