entity-framework-6.1

By default convention, strings properties in an entity model that are not explicitly given a max length are set to nvarchar(max) in the database. We wish to override this convention and give strings a max length of nvarchar(100) if they are not already explicitly set otherwise. I discovered the PropertyMaxLengthConvention built-in convention, which by its description and documentation would seem to be what I am looking for. However, it either doesn't work or I'm using it wrong or it just doesn't do what I think it does. I've tried simply adding the convention: modelBuilder.Conventions.Add(new

I understand how to add conventions to the code first (with migrations) project. I have successfully managed to perform the table names and even changed GUID Id fields to non-clustered. But I have not found how to change the default index name that EF supplies when no name is given. [Index(IsUnique = true)] public string Code { get; set; } [Index] public string Description { get; set; } I have these two requirements. The top index should be named UX_[schema]_[table]_Code , the second IX_[schema]_[table]_Description I also have the need to support multiple column indexes where IsUnique will

I'm using EF 6.1.1 and Database First. When I import a stored proc into the edmx and generate the DBContext it looks like this: return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction<TestSP_Result>("TestSP", params[]...) That returns an ObjectResult< T >, which implements IDbAsyncEnumerable< T > so I'm doing this to read the data async: IDbAsyncEnumerable<T> enumerable = objectResult as IDbAsyncEnumerable<T>; IDbAsyncEnumerator<T> enumerator = enumerable.GetAsyncEnumerator(); List<T> list = new List<T>(); bool moreItems = await enumerator.MoveNextAsync(CancellationToken.None);

I am working with a situation where we are dealing with money transactions. For example, I have a table of users wallets, with their balance in that row. UserId; Wallet Id; Balance Now in our website and web services, every time a certain transaction happens, we need to: check that there is enough funds available to perform that transaction: deduct the costs of the transaction from the balance. How and what is the correct way to go about locking that row / entity for the entire duration of my transaction? From what I have read there are some solutions where EF marks an entity and then compares

I have a custom CLR Aggregate function on SQL Server to calculate percentiles. Is it possible to call my custom aggregate function through Entity Framework? How is the mapping configured to allow this? I have tried using codefirstfunctions similar to what is described on Entity Framework 6 Code First Custom Functions , however the functions seem to only be allowed to take scaler parameters, where my function is an aggregate function so will need to take a list of items (similar to how Sum, Averagg and Count work). The Aggregate functions has the following signature, taking in the value we want

I am using EF 6.1 and I use code first approach with an existing database with data in a production environment. Is it possible at all to migrate model changes and keep the existing customer`s data? Yes, however, it can be complicated depending on specific case (on complexity of changes): Overview: http://msdn.microsoft.com/en-us/library/dn579398.aspx#option1 Read this: http://msdn.microsoft.com/en-us/library/jj591621.aspx And then this: http://msdn.microsoft.com/en-us/library/dn481501.aspx 来源： https://stackoverflow.com/questions/23415921/entity-framework-code-first-migration-keep-existing

Let's make a case to explain my problem. MyTable1 +id +myTable2Id MyTable2 +id MyView1 +id +myTable2Id MyView1 exists in the case, from data from the MyTable1. Now i want to create a Navigation property from my EF6.1 Code first approach in my View to MyTable2. I know that it was possible from the database first approach, but is it also possible from the code-first approach and how? EDIT: I search some on internet, but due many meanings of the word View, it's very hard to find information on it. Also with the approaches in codes that i tried, i always get an error that the migration can't be