Question

I am trying to implement a Filter by Date on my hotel reservation project.

Could somebody help me please to convert this sql code to linq .

SELECT r.*
FROM Room r LEFT JOIN Reservation v ON r.RoomID = v.RoomID
AND NOT (@StartDate >= Date_Check_Out OR @EndDate <= Date_Check_In)
AND v.cancel = 0
WHERE v.ReservationID IS NULL

Answer 1

One of good tool to convert SQL to Linq : Linqer

Try out this query

var q = (from r in Room 
            join v in Reservation on r.RoomID equals v.RoomID  into outer
            from o in outer.DefaultIfEmpty()
            where !(o.Date_Check_Out<= startdate || o.Date_Check_In>=endDate)
                  && v.cancel == 0 && v.ReservationID == null 
            select r);

Also check this :

See SQL to LINQ Tool
existing thread.

If you decide to do it by hand, Linqpad should be useful.

You also like to see : SQL to LINQ ( Visual Representation ) some good exaple by graphical representation…