How to rewrite Entity Framework query to SQL Server query - sql

Question

I have a table called passenger policy that looks like this:
public Guid HotelId { get; set; }
public int FromAge { get; set; }
public int ToAge { get; set; }
public PassengerType PassengerType { get; set; }
and it has 3 rows for each HotelId key.
I have another table called search that looks like this
public class Search : BaseEntity
{
public DateTime Date { get; set; }
public Guid CountryId { get; set; }
public Guid ProvinceId { get; set; }
public Guid CityId { get; set; }
public Guid HotelId { get; set; }
public Guid VendorHotelRoomId { get; set; }
public int StandardCapacity { get; set; }
public int ExtraCapacity { get; set; }
public int MaxInfantAge { get; set; }
public int MaxChild1Age { get; set; }
public int MaxChild2Age { get; set; }
public double BasePrice { get; set; }
public double ExtraAdultPrice { get; set; }
public double ExtraInfantPrice { get; set; }
public double ExtraChild1Price { get; set; }
public double ExtraChild2Price { get; set; }
}
I want to write a query in T-SQL (SQL Server) to get hotels based on date field, standard capacity and extra capacity.
The extra capacity has 3 possible values:
infant
child 1
child 2
(fetched from passenger type table)
I write it like this in EF Core
var searchOnAllVendors hotelContext.Search
.Where(c => c.Date >= fromDate
&& c.Date <= toDate
&& c.CityId == cityId
&& c.ExtraCapacity >= adultCount)
.AsEnumerable();
foreach (var item in searchOnAllVendors)
{
foreach (var ag in request.Passengers.ChildrensAges)
{
if (ag <= item.MaxInfantAge && ag < item.MaxChild1Age && ag < item.MaxChild2Age)
infant++;
if (ag > item.MaxInfantAge && ag <= item.MaxChild1Age)
child1Count++;
if (ag > item.MaxChild1Age && ag <= item.MaxChild2Age)
child2Count++;
if (ag > item.MaxChild1Age && ag <= item.MaxChild2Age)
extraAdult++;
}
if (item.MaxInfantAge >= infant && item.MaxChild1Age >= child1Count && item.MaxChild2Age >= child2Count)
{
var adulPrice = extraAdult * item.ExtraAdultPrice;
var infantPrice = infant * item.ExtraInfantPrice;
var child1Price = child1Count * item.ExtraChild1Price;
var child2Price = child1Count * item.ExtraChild2Price;
var finalPrice = adulPrice + infantPrice + child1Price + child2Price + item.BasePrice;
searches.Add(new Search_Response
{
CityId = item.CityId,
CountryId = item.CountryId,
HotelId = item.HotelId,
ProvinceId = item.ProvinceId,
VendorHotelRoomId = item.VendorHotelRoomId,
Price = finalPrice
});
}
}

Answer 1

after couple days and try a few things i find a way to have best performance in T-SQL
...
1. Get count of extra passernger types in scalar-valued functions like this :
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER FUNCTION [dbo].[GetChildRule](#ages as nvarchar(max),#min as int,#max as int)
RETURNS int
AS
BEGIN
declare #count int
select #count=count(*) from STRING_SPLIT(#ages,',')
where value > #min and value <= #max
RETURN #count
END
...
and use it in stored procedure like a field as below :
select * , GetChildRule('1,2,3',mymin,mymax) from Search where date between date1 and date2
and call it in EF CORE:
Context.Set<YourModelWithAllOfFiledYouReturnInSP>()
.FromSqlRaw($"EXEC [dbo].[StaySearch] #extraAges = N'{ages}',
#checkInDate = N'{fromDate}', #checkOutDate = N'{toDate}',
#destinationId = '{destinationId}',
#countrySearch = '{countrysearch}',#adultCount={adultCount}");