1. Entity Framework Core (EF Core)
Marko Šarić
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Content
What is EF CORE
EF Core Database Support
Entity Framework Core vs Entity Framework 6.x
The Model (Database Context)
Querying data
Saving data
Stored procedures
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How to use?
.NET Core has reached the 1.1 release. It's cross-platform, open source, and wicked fast. Plus you can code on your Mac.
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What is EF Core
Object-relational mapper (O/RM) that enables .NET developers to work with a database using .NET objects. It eliminates the need for most of the data-access code that developers usually need to write.
Lightweight, extensible, and cross-platform version of Entity Framework.
Built over a completely new set of core components. EF Core doesn't automatically inherit all the features from EF6.x.
Some of these features will show up in future releases (such as lazy loading and connection resiliency)
Less commonly used features will not be implemented in EF Core.
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Microsoft SQL Server (including SQL Azure)
Also support for SQL Server Compact Edition
Memory-Optimized Table support was introduced in EF Core
SQLite
PostgreSQL
MySQL
Built-in in-memory database (designed for testing purposes only)
The Oracle .NET team is evaluating EF Core support, but have not announced any timing
Database providers are installed through NuGet
PM> Install-Package Microsoft.EntityFrameworkCore.SqlServer
PM> Install-Package Npgsql.EntityFrameworkCore.PostgreSQL
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Features not in EF Core
Spatial data types such as SQL Server's geography & geometry
Graphical visualisation of model
Loading related data: Lazy
Stored procedure mapping (stored procedures are supported)
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7. The Model
A model is made up of entity classes and a derived context that represents a session with the database, allowing you to query and save data.

8. Querying
Instances of your entity classes are retrieved from the database using Language Integrated Query (LINQ)

9. Querying Loading Related Data
• Eager loading: related data is loaded from the database as part of the initial query
• Explicit loading: related data is explicitly loaded from the database at a later time

10. Saving data
Data is created, deleted, and modified in the database using instances of your entity classes

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Stored Procedures
Use FromSql method which executes RAW SQL queries.
Limitations (and misconceptions):
SQL queries can only be used to return entity types that are part of your model. Therefore, it cannot contain related data
The SQL query must return data for all the properties of the entity. So basically your SQL query should be Select * from {tableName}
The column names in the result set must match the column names that properties are mapped to
For INSERT, UPDATE, DELETE queries: ExecuteSqlCommand.
It returns integer value which indicates the count of affected rows
ExecuteSqlCommand should be used on context.Database
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References
Official Technical Documentation
101 LINQ Samples
EF Core 1.0: First Look
LINQ Fundamentals with C# 6.0
Building a Web App with ASP.NET Core, MVC 6, EF Core, and Angular
app/
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Hvala na pozornosti
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