ORM (Object Relational Mapper) is a tool that creates layer between your application and data source and returns you the relational objects instead of (in terms of c# that you are using) ADO.NET objects. This is basic thing that every ORM does. To do this, ORMs generally execute the query and map the returned DataReader … Read more
Is it possible to use anonymous types with Dapper? Sure see the non-generic Query override, it return a dynamic IDictionary<string, object> this object is an expando that can either be cast or accessed with dot notation. Eg: var v = connection.Query(“select 1 as a, 2 as b”).First(); Console.Write(“{0} {1}”,v.a, v.b) // prints: 1 2 is … Read more
You need to include the column you’d want to split on in your select query. Yours just selects all the other properties – so Dapper doesn’t find a matching column to split the objects. Your query should probably be something like that: var query = @”SELECT AlbumId, Title, Price, AlbumArtUrl, GenreId, Name, Description , ArtistId, … Read more
I got the same issue and implemented some code after doing some search but having no ready-to-use stuff. There is a package on nuget MiniProfiler.Integrations I would like to share. Update V2: it supports to work with other database servers, for MySQL it requires to have MiniProfiler.Integrations.MySql Below are steps to work with SQL Server: … Read more
You are passing the cancellation token as the parameter object; that won’t work. The first async methods in dapper did not expose a cancellation token; when I tried to add them as an optional parameter (as a separate overload, to avoid breaking existing assemblies), things got very confused with “ambiguous method” compilation problems. Consequently, I … Read more
You can do something like this (see https://www.tritac.com/blog/dappernet-by-example): public class Shop { public int? Id {get;set;} public string Name {get;set;} public string Url {get;set;} public IList<Account> Accounts {get;set;} } public class Account { public int? Id {get;set;} public string Name {get;set;} public string Address {get;set;} public string Country {get;set;} public int ShopId {get;set;} } var … Read more
Does anyone have any updates on performance regarding EF 6.1.x? This concerns general queries made within a DbContext? Ans: I don’t have specific numbers, but I have updated the performance rig to EF6; I can’t remember the outcome exactly, but: EF6 is a lot faster than EF-old, but dapper is still significantly faster in many … Read more
I think you should be able to do it by casting null to the appropiate type. Let’s assume RouteId is an integer: connection.Execute(“spLMS_UpdateLMSLCarrier”, new { RouteId = (int?)null, CarrierId = carrierID, UserId = userID, TotalRouteRateCarrierId = totalRouteRateCarrierId }, commandType: CommandType.StoredProcedure); The problem you are encountering when using regular null is likely that the compiler cannot … Read more
Sure! As per dapper documentation use the query method and get your dymanics: dynamic account = conn.Query<dynamic>(@” SELECT Name, Address, Country FROM Account WHERE Id = @Id”, new { Id = Id }).FirstOrDefault(); Console.WriteLine(account.Name); Console.WriteLine(account.Address); Console.WriteLine(account.Country); As you can see you get a dynamic object and you can access its properties as long as they … Read more
You need to add attribute MultipleActiveResultSets in connection string and set it to true to allow multiple active result sets. “Data Source=MSSQL1;” & _ “Initial Catalog=AdventureWorks;Integrated Security=SSPI;” & _ “MultipleActiveResultSets=True” Read more at: https://learn.microsoft.com/en-us/dotnet/framework/data/adonet/sql/enabling-multiple-active-result-sets