Does SQL Server automatically trim nvarchar fields upon query?

Question

I have this query :

select \'[\' + p.Firstname + \']\' from Person p
where p.Firstname = \'Johanne\'

In the table, I have multiple personn

Answer 1

You could create a new view in Sql and map that view back to an EF object. The view could contain the length of the field(s), in the select using DataLength, you know you want to match against and then you could filter on that in your where clause when you use EF. Alternatively you could create a Sql Stored Proc that does a comparison using LIKE without wild cards (which produces the desired result) and map that back to your code and call it in your Where statement in EF.

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Using View

Create View MyCustomView
AS
SELECT [column1,column2,etc], DATALENGTH(FirstName) AS FirstNameLength
FROM Person
GO

Then your EF would be:

Persons.Where(p => p.FirstNameLength == "Johanne".Length && p.FirstName == "Johanne");

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To use a Stored Proc

CREATE PROCEDURE [dbo].[GetPersons]
firstName int = null
AS
BEGIN
SET NOCOUNT ON;
select [your fields here]
from persons
where FirstName like @firstName
END

In C# make sure your mapping is correct and then

this.Database.SqlQuery("GetPersons","Johanne");

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EF6 also supports directly editing the sql in the DbContext before it is executed. You could develop some custom code that replaces the = with like under specific circumstances but maybe easier to try the above first before you do that.