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While we can install the tooling globally, it’s best to version the CLI tooling and EF Core together in your solution. As a long-time user of earlier Entity Framework versions, I started writing this post with many preconceived notions about pitfalls from that experience. You need to understand the underlying database to design, debug and maintain production app performance at the highest possible level. Let us have a look at the example of the Entity Framework Core Code First. We will use classes generated in the Database First example and generate a new database FacultyDatabase2 and the corresponding tables. The strongly-typed approach to the data suggests using definite classes in an object-oriented way.

The most powerful approach is by using From and To arguments. With EF Core, we can apply an index using the ModelBuilder instance within the OnModelCreating method. As of writing this post, indexes can only be applied using the ModelBuilder, and there is no data annotation attribute equivalent. Let’s look at projecting our Movie model into a result that includes characters and actor data. All instances of the same Actor model will point to the same object, thus saving us from over-allocating. EF Core will not load the Characters and Ratings navigation properties in the following query.

Use asynchronous instead of synchronous code

First, we need to install the NuGet package for the provider of the database we want to access. Here we want to access MS SQL Server Database, so we need to install Microsoft.EntityFrameworkCore.SqlServer NuGet package. The entity type ‘Order’ requires a primary key to be defined. Entity Framework Core is an ORM Framework for the .NET World. It allows developers to work with databases without even touching them. It makes DB related operations quite simple and effecient.

• When fetching data, you should use projections to pick just the required fields and avoid retrieving unnecessary fields.
• You can connect to a SQL Server Instance as well, by modifying the connection strings.
• “Delete” is one of those words that can have a different meaning depending on our perspective.
• When you use IQueryable, the SQL statements will be executed on the server side, where the data is stored, whereas IEnumerable requires the query to be executed on the client side.
• All you have to enter is the data type and the name of the property.

Doing this will resolve your “unable to get session context” error when connecting to PostgreSQL through Pgpool. I have set primary key in class Order with attribute [Key], but it does not work. When user created from one domain and confirming from another what is entity framework domain , GenerateEmailConfirmAsync token is invalid when confirm email . I have used DataProtectionKeys for this but still token is coming as invalid. The other case is when you want save any attribute in the relation like a date for example.

Entity Framework Core in ASP.NET Core 3.1 – Getting Started

EF Core introduced an AsSplitQuery method that allows Entity Framework to split each related entity into a query on each table. EF Core ships with Global Query Filters that make implementing soft deletes straightforward. We first start by adding a boolean column of IsDeleted to our entity. Using the model builder interface to combine columns should add to the efficiency of SQL queries. With TPH, we would generate an SQL Statement equivalent to querying a single table.