In the method, we write the SQL query for fetching the movies along with their director names. Var result = await conn.QueryAsync(query) Using ( var conn = new SqlConnection(_connectionString.Value)) Public MovieRepository( ConnectionString connectionString)Ĭonst string query = m.Id, m.Name,d.Name AS DirectorName, m.ReleaseYear Private readonly ConnectionString _connectionString Public class MovieRepository : IMovieRepository 1Īdd a class MovieRepository.cs which implements the IMovieRepository interface. Now add an interface IMovieRepository.cs with the method signature for getting all movies. Var connectionString = new ConnectionString(Configuration.GetConnectionString( "DefaultConnection")) Add the following lines in the ConfigureServices method in Startup.cs. Now we need to register the configuration in the ASP.NET Core dependency injection container. Public ConnectionString( string value) => Value = value We will use this class to hold the connection string value from the configuration file and use it in our classes via dependency injection. 1Īdd a class ConnectionString in the solution. Add the following section in the appsettings.json file. 1įor interacting with the database we need to set up our connection string in our configuration. If the column names are different we can make use of SQL aliases to match with the property name. Then only Dapper will map the result columns with the class. This class shall have property names matching with column names in the query result. Create a model class named MovieModel.cs. Now let’s write our first API for getting all the movies in the database. Dapper will only map our query results to objects. This is the main difference between EF and Dapper. Dapper will execute the query and will map the result to our POCO classes. We need to write the SQL query ourselves and shall ask Dapper to execute it for us. Unlike Entity Framework, Dapper will not translate our LINQ queries to SQL. As an alternative, we can install these packages with DotNet CLI also. Visual Studio users can make use of the Nuget package manager of Visual Studio. Now we need to install two Nuget packages in our project - Dapper and. Now create an ASP.NET Core Web API project. IDENTITY( 1, 1) PRIMARY KEY,įOREIGN KEY() REFERENCES. Use the following SQL script to create and seed the database. The application will be interacting with a SQL Server database with two tables - Movies and Directors. If Visual Studio 2019 is not available we can use Visual Studio Code and DotNet CLI for development. NET Core 3.0 SDK and requires Visual Studio 2019. Most of the code will be compatible with earlier versions of. We shall be creating an ASP.NET Core Web API application with. In this article, we will look at some features of Dapper and how to integrate Dapper with an ASP.NET Core application. It is an open-source library and source code is available at Github. Dapper is a micro ORM which is developed by folks at StackOverflow. But there are other ORM tools available for. NET developers out there the primary choice of data access will be Microsoft’s object-relational mapper Entity Framework.
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