Question

I have tried several things but it does not work. Basically, I want to add nested query on EF MVC3.

SQL Query:

select * from Book where Book_PK in ( select Book_Ref from Library
where Library_Ref=’18bd9526-f3e9-4d5b-86cd-ccfea64b6f7b’ )

Book_PK is primary key of Book
Book_ref is foreign key to Book

Library_Ref is just attribute to filter the Book_ref

I have 2 tables: Book and Library which are connected through foreign key.

I only have one input, which is id, but this is not the primary key of Library.
I have tried:

`
School.Models.Entities.SchoolAll db = new Models.Entities.SchoolAll(); // db consists whole database

var temp = db.Books.Where(e => e.Book_PK.Contains(db.Libraries.Where(f => f.Library_Ref == id))).ToList();
// where id is one of the field of Library`

each Library entity may have one or may Book entity. So, the result of the query is supposed to be as list. I need to save this list into one variable. Can anyone help me?

Answer 1

Successfully done, converting below query:

select * from Book where Book_PK in ( select Book_Ref from Library
where Library_Ref=’18bd9526-f3e9-4d5b-86cd-ccfea64b6f7b’ )

Into below entity framework:

db.Books.Where(y => y.Libraries.Any(r => r.Library_Ref ==
id)).ToList()

Thanks stackoverflow