I want to convert this sql query into a linq query.
SELECT
CreationUtcTime,
Speed,
convert((CreationUtcTime - LAG(CreationUtcTime) OVER (ORDER BY CreationUtcTime)), char) AS diff
FROM assetstatusrecords
WHERE
Speed <> 0.00 and
CreationUtcTime <= '2022-03-28' and
CreationUtcTime >= '2022-02-21' and
AssetId = '7556d50c-95e5-4cd5-a31d-b4d6c6ab1fb1'
ORDER BY CreationUtcTime
Model Class for LINQ
class AssetStatusRecord : Entity
{
protected AssetStatusRecord()
{
}
public AssetStatusRecord(CoordinatesValue coordinates, double speed,
LengthValue distanceTravelled, Guid sensorId, Guid? assetId,
int? heading, Guid readingId, DateTime? sensorDateTime)
{
Coordinates = coordinates;
Speed = speed;
DistanceTravelled = distanceTravelled;
SensorId = sensorId;
AssetId = assetId;
Heading = heading;
ReadingId = readingId;
SensorDateTime = sensorDateTime;
}
public CoordinatesValue Coordinates { get; private set; }
public double Speed { get; private set; }
public LengthValue DistanceTravelled { get; private set; }
public Guid SensorId { get; private set; }
public Guid? AssetId { get; private set; }
public int? Heading { get; private set; }
public Guid ReadingId { get; private set; }
public DateTime? SensorDateTime { get; private set; }
}
And the Entity Class are as follows : -
public class Entity : IEntity
{
public Entity();
public Guid Id { get; protected set; }
public long SequentialId { get; protected set; }
public DateTime CreationUtcTime { get; protected set; }
public DateTime CreationLocalTime { get; protected set; }
}
And the Interface IEntity :-
public interface IEntity
{
Guid Id { get; }
long SequentialId { get; }
DateTime CreationUtcTime { get; }
}
This model class can be used to execute linq query which I am using in below query in comments
If you are using EF Core, you can execute such query via linq2db.EntityFrameworkCore extension. Note that I'm one of the creators.
With this extension you can use LAG
in LINQ query:
var query =
from s in context.AssetStatusRecord.ToLinqToDB() // switch LINQ Provider
where s.Speed != 0
&& s.CreationUtcTime <= endTime
&& s.CreationUtcTime >= startTime
&& s.AssetId == assetId
orderby s.CreationUtcTime
select new
{
s.CreationUtcTime,
s.Speed,
diff = s.CreationUtcTime -
Sql.Ext.Lag(s.CreationUtcTime)
.Over()
.OrderBy(s => s.CreationUtcTime)
.ToValue()
};
var result = query.ToList();