Entity Framework 5, Code First, Full Text Search but IQueryable via CreateQuery?

问题

I am using .NET 4.5 and EF 5 with Code First approach and now I need to implement Full Text Search. I have already read a lot about it and so far my conclusions are:

• Stored procedures nor Table Value Functions can not be mapped with Code First.

• Still I can call them using dynamic sql

  dbContext.Database.SqlQuery<Movie>(Sql, parameters)

But this returns IEnumerable and I want IQueryable so that I can do more filtering before fetching the data from db server. I know I can send those parameters to Db function but I don't want that.

• What I have found that could fulfill my needs is CreateQuery function from IObjectContextAdapter that looks like this(Select All just for test):

  IQueryable<Movie> result = ((IObjectContextAdapter)dbContext).ObjectContext.CreateQuery<Movie>("SELECT * FROM Movie");

• However executing this throws Exception" 'System.Data.EntitySqlException was unhandled HResult=-2146232006 Message=The query syntax is not valid. Near term '*', line 1, column 9.'

So the questions are:

• Why do I get this exception and can it be fixed ?

• If not is there any way with Code First to do FTS that returns IQueryable ?

回答1:

Try it like this

ObjectQuery<Movie> query = 
    objectContext.CreateQuery<Movie>(@"SELECT VALUE movie FROM Movies");  

As for why see these links

Differences from Transact-SQL Unlike Transact-SQL, Entity SQL does not support use of the * argument in the SELECT clause. Instead

Entity SQL Reference - SELECT
"SELECT VALUE" - value keyword in LINQ/Entity Framework query

来源：https://stackoverflow.com/questions/16134193/entity-framework-5-code-first-full-text-search-but-iqueryable-via-createquery