Ignoring accents in SQL Server using LINQ to SQL
Solution 1
In SQL queries (Sql Server 2000+, as I recall), you do this by doing something like select MyString, MyId from MyTable where MyString collate Latin1_General_CI_AI ='aaaa'.
I'm not sure if this is possible in Linq, but someone more cozy with Linq can probably translate.
If you are ok with sorting and select/where queries ALWAYS ignoring accents, you can alter the table to specify the same collation on the field(s) with which you are concerned.
Solution 2
See the following answer:
LINQ Where Ignore Accentuation and Case
Basically you need to alter the field type in SQL Server, e.g.
ALTER TABLE People ALTER COLUMN Name [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AI
There does not seem to be a way to do this using LINQ, apart from calling a custom method to remove diacritics (which would not be performant).
Solution 3
LINQ to SQL doesn't have any specific functionality for setting the collation used for a query and so it will always use the database default.
Solution 4
It seems that there is a way to ignore the collation differences in Linq to SQL by using t-sql functions:
CREATE FUNCTION [dbo].[func_ConcatWithoutCollation]
(
@param1 varchar(2000),
@param2 varchar(2000)
)
RETURNS varchar(4000)
AS
BEGIN
IF (@param1 IS NULL) SET @param1 = ''
IF (@param2 IS NULL) SET @param2 = ''
RETURN @param1 COLLATE Latin1_General_CS_AS + @param2 COLLATE Latin1_General_CS_AS
END
to get this function in linq to sql, there is a switch for SqlMetal: /functions. Example:
"%ProgramFiles%\Microsoft SDKs\Windows\v7.0A\Bin\SqlMetal.exe" /server:. /database:NameOfDatabase /pluralize /code:ContextGenerated.cs /sprocs /views /functions
Use this function in Linq to sql like this:
from s in context.Services
where context.Func_ConcatWithoutCollation(s.Description, s.Email) == "whatever"
select s
It helped me, maybe somebody finds this useful too.
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Comments
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Farinha about 2 years
How can I ignore accents (like ´, `, ~) in queries made to a SQL Server database using LINQ to SQL?
UPDATE:
Still haven't figured out how to do it in LINQ (or even if it's possible) but I managed to change the database to solve this issue. Just had to change the collation on the fields I wanted to search on. The collation I had was:
SQL_Latin1_General_CP1_CI_AS
The CI stans for "Case Insensitive" and AS for "Accent Sensitive". Just had to change the AS to AI to make it "Accent Insensitive". The SQL statement is this:
ALTER TABLE table_name ALTER COLUMN column_name column_type COLLATE collation_type
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David Lay over 14 yearsThanks, I was just to apply regex replace. That would have been terrible!
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TravisOThe purpose of tags isn't to just make anything up, the subject is linq, so just use 'linq', don't create 'sqltolinq' because nobody else will ever use such a random tag again, so it's a waste.
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FarinhaHhmm, I didn't just create a new tag, I used 'linqtosql' that has been used in about 290 questions...
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Alicia over 13 yearsHere's a sample, I probably picked this up from one of my web searches but can't remember the URL. SELECT * FROM nametable WHERE name = 'abbee' COLLATE Latin1_General_CI_AI -- Case-Insensitive, Accent-Insensitive comparison AND <anotherColumn> LIKE '%Accent%' COLLATE Latin1_General_CI_AS -- Case-Insensitive, Accent-Sensitive comparison ORDER BY <yetAnotherColumn> DESC COLLATE Latin1_General_CS_AS -- Case-Sensitive, Accent-Sensitive sort order