Entity Framework Core Series with ASP NET Core

If you use these providers to develop your application, the application will be ready for cloud environments like Azure. Other than supporting additional storage options, the providers work like the existing SQL-based providers, so that you can easily switch an application to use cloud storage via SQL Azure. Regardless of the approach, you will need an entity model class to match each table, and a controller class for the table and the actions you are going to have on it. With code first you will create your DB and tables from the code. With DB first you already have your DB and then your code needs to match your tables.

We can use the SQL syntax with the help of ADO.NET Command objects and it always returns data in the form of DataReader or DataSet objects. A dataset is a container of multiple DataTable Objects and every data table can have a relationship among them. We can access the data source and fill the dataset with the help of data providers. The .NET Framework provides us with three different types of data providers – ADO.NET, OLEDB, and ODBC. Entity Framework is an open-source ORM (Object Relational Mapping) Framework for the .NET applications supported by Microsoft.

EF 6 Version History

LINQ is a .NET data querying language which can query a multitude of data sources, one of which are
entities via LINQ to Entities. This tutorial covers how to use Entity Framework, Language
Integrated Query (LINQ), and generate Data Definition Language (DDL) scripts using Model-First
for Oracle database. The -c (or –context) parameter can be passed to any of the dotnet ef commands and is required if your application uses more than one DbContext class. As a result of going through these articles, you should have a great understanding of using EF Core in your applications. Therefore, using migrations, creating configuration or writing optimized queries will be no problem at all. ASP.NET Universal Providers add provider support in ASP.NET 4 for all editions of SQL Server 2005 and later and to SQL Azure.

In my experience, the DB is maintained on its own, and the code uses it, so I’ll be using the DB first approach. EF Core has improved many issues found in previous versions of Entity Framework. While still being an abstraction for database what is entity framework engines, the interface additions to EF Core seem to embrace the inevitability of dealing with the database. This repeated data can lead to what’s known as a Cartesian Explosion if there are enough tables involved within a query.

Installation of EF

When dealing with large dataset operations, it is better to embrace the underlying data storage engine rather than LINQ our way through thousands of records. EF Core introduced an AsSplitQuery method that allows Entity Framework to split each related entity into a query on each table. In our OnModelCreating method, we can then apply a query filter that applies to any query performed on the Production entity. We should always approach migrating production data with extreme caution as any modification could lead to data loss. Automating the application of schema changes is optimal, as it removes the potential for human error. We can opt into identity resolution while opting out of object tracking by using the newly added AsNoTrackingWithIdentityResolution method.

• One instance of context class is used to retrieve the data, and another is used to save the data.
• If the specified database does not exist, a new database is created.
• Entity Framework 6 (EF6) is a tried and tested object-relational mapper for .NET with many years of feature development and stabilization.
• Given EF Core’s LINQ interface, it’s tempting to do all our operations using our C# entities.

It can be difficult depending on the database, but with containerization technologies like Docker, the problem of managing isolated instances has never been easier for developers. Database administrators and developers should work towards delivering value for users. If it’s impossible to do so due to organizational reasons, consider the next section as a possible solution. Knowing that EF Core is different, I took some time to explore the EF Core documentation and determine the existing pitfalls you might encounter when starting your EF Core journey. I’ve compiled and consolidated this information to help you get a general overview of potential mistakes you may encounter. Let’s assume the Department and the Employee table tables consider like the table contains the records of several departments and the employees of various departments.

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Changes to data can be implemented by passing any syntactically correct SQL command to the migrationBuilder.Sql method in the Up or Down method. It is even possible to add migration without changing the model. The dotnet ef migrations add command without modifying the model results in an empty migration.

DbContext also provides a mechanism for tracking changes to entities and saving those changes to the database. You can also use the FirstOrDefault method, which returns Null if no match is found. Entity Framework 6 (EF6) is a tried and tested object-relational mapper for .NET with many years of feature development and stabilization. Before starting this course, it will help to be familiar with Visual Studio. Aside from that, the information pertaining to Entity Framework itself is intended for beginners. Entity Framework helps increase developers’ productivity by mitigating redundancy of persisting data.