Microsoft实体框架中使用的原始SQL查询是否返回对象？

Question

I personally like SQL, but I realize I probably need to follow the EF design. At times and with other team members, SQL will be used. When a Raw SQL Query is made, does it return objects/properties for my C# code? If I have five tables mapped, and I do a raw query, are corresponding properties returned?

Answer 1

The answer is yes. You need to define your entity class for the result of your raw SQL Query, remember to make the name of the properties exactly the same with the name of returned columns in your query.

context.Database.SqlQuery<YourEntity>("your query").ToList();

Answer 2

With EF, you have to create and maintain the POCO for your raw query, and your query text will probably languish inside double quotes somewhere. Why not grab QueryFirst ? Your sql will be in .sql file, and the wrapper code, including POCO will be generated and managed for you. And there are numerous other advantages !

You don't have to use one approach exclusively. Lots of folk use EF, then Dapper or something like it when they need/want to "revert" to SQL. QueryFirst isn't an ORM and doesn't replace EF. Obviously if you let EF manage your schema, (code first, model first) then non-EF queries risk being walloped by EF schema changes. But with QueryFirst at least, you can "recompile" your queries to assure they're working and still return what you need after EF has changed your schema.

Disclaimer: I wrote QueryFirst.