在Entity Framework中使用没有主键的只读表

Question

Working with a client that has a readonly database and a table that has no primary key. I am attempting to compare one table, "item" (has a primary) with "Pics" [No key] in order to get results from "item" that have pictures. Whether or not each item has a picture in "Pics". I cannot edit the databases themselves in SQL.

My ultimate goal is to return the results that only have pictures.

I've tried to use a raw SQL Query and then convert it to an IQueryable, however this does not allow me to search items using other parameters and is EXTREMELY slow. (there are probably 75+ columns in the "item" table and 10,000+ total items) I can only figure out how to use the query with 'SELECT *'.

Controller:

entities db = new entities();

var results = (from s in db.items
                           select s);

...

var Pics = db.Database.SqlQuery<Item>(
"SELECT * FROM dbo.Pics
AS p JOIN dbo.item
AS i ON 
i.item = p.item
WHERE p.Pic = 'Yes'").AsQueryable(); 

...

results = Pics;

...

return View(results);

Answer 1

Try this

var results = from i in db.items
              join p in db.Pics
              on i.item equals p.item
              where p.Pic == "Yes"
              select i;