c# - Entity Framework v4.1 LIKE

Question

How do I have to build my query to result in an output SQL query like:

SELECT
[viewRegisters].[Id] AS [IdRegister]
WHERE Name LIKE '%a%bc'

OR

SELECT
[viewRegisters].[Id] AS [IdRegister]
WHERE Name LIKE 'a%b%c'

OR

SELECT
[viewRegisters].[Id] AS [IdRegister]
WHERE Name LIKE 'a%b%c%'

I'm using .Net Framework 4.0, Entity Framework v4.1 and C#.

EF v4.1 converts this type of linq queries from:

((IQueryable<T>)Data).Where(z => z.Field.Contains("a%b%c%"));

Into:

SELECT
[viewRegisters].[Id] AS [Id]
WHERE Name LIKE N'a~%b~%c~%' ESCAPE N'~'

That's not what I want. I want to be able to use the 'percent' symbol as I do directly in DB.

Answer 1

You must use ESQL if you want full wildcard support. Linq-to-entities is not able to do that and EFv4.1 code first (without EDMX) doesn't have support for model defined functions so the solution provided by @Johann Blais cannot be used.

I guess the code to run ESQL query can look like:

string command = "SELECT VALUE e FROM ContextName.DbSetName AS e WHERE e.Field LIKE 'a%b%c%'"
ObjectContext ctx = ((IObjectContextAdapter)dbContext).ObjectContext;
ObjectQuery<EntityType> query = new ObjectQuery<EntityType>(command, ctx);
ObjectResult<EtntiyType> result = query.Execute(MergeOption.AppendOnly);