10 Questions
What is the primary purpose of Entity Framework?
To provide a layer of abstraction between the application code and the database
Which of the following features is supported by Entity Framework Core?
Multi-Provider Support
What is the purpose of the Change Tracking feature in Entity Framework?
To automatically track changes made to objects and update the database accordingly
What is the role of the DbContext class in Entity Framework?
To coordinate the interaction between the application and the database
What is the purpose of the DbSet class in Entity Framework?
To query and update entities
What is the role of the Entity Data Model in Entity Framework?
To represent the relationships between entities
What is the purpose of the IQueryable interface in Entity Framework?
To represent a query that can be executed against the database
What is the difference between Lazy Loading and Eager Loading in Entity Framework?
Lazy Loading defers loading of related objects until they are actually needed, while Eager Loading loads related objects along with the main object
What is the purpose of the DbFunctions in Entity Framework?
To execute database-specific functions
What is the difference between Entity Framework Core and Entity Framework 6?
Entity Framework Core is a cross-platform, open-source version, while Entity Framework 6 is a closed-source, Windows-specific version
Study Notes
What is Entity Framework?
- An Object-Relational Mapping (ORM) framework for .NET applications
- Enables developers to work with relational data using .NET objects
- Provides a layer of abstraction between the application code and the database
Key Features
- SQL Generation: Automatically generates SQL code to interact with the database
- Change Tracking: Automatically tracks changes made to objects and updates the database accordingly
- Lazy Loading: Defers loading of related objects until they are actually needed
- Eager Loading: Loads related objects along with the main object
- Support for LINQ: Allows developers to use LINQ queries to interact with the database
Entity Framework Core vs Entity Framework 6
- Entity Framework Core: A cross-platform, open-source version of Entity Framework
- Entity Framework 6: A closed-source, Windows-specific version of Entity Framework
Entity Framework Core Features
- Multi-Provider Support: Supports multiple databases, including SQL Server, MySQL, PostgreSQL, and more
- Cross-Platform: Runs on Windows, Linux, and macOS
- Open-Source: Allows for community contributions and customization
Entity Data Model
- Entity: A class that represents a table in the database
- Entity Set: A collection of entities
- Navigation Property: A property that represents a relationship between entities
- Entity Container: A top-level container that holds all the entities and their relationships
DbContext
- DbContext: A class that coordinates the interaction between the application and the database
- DbSet: A collection of entities that can be queried and updated
- SaveChanges: A method that saves changes made to the entities to the database
Querying with Entity Framework
- LINQ Queries: Allows developers to use LINQ to query the database
- IQueryable: An interface that represents a query that can be executed against the database
- ** DbFunctions**: A set of functions that can be used to execute database-specific functions
What is Entity Framework?
- Object-Relational Mapping (ORM) framework for .NET applications
- Enables developers to work with relational data using .NET objects
- Provides a layer of abstraction between application code and the database
Key Features
- Automatically generates SQL code to interact with the database (SQL Generation)
- Automatically tracks changes made to objects and updates the database accordingly (Change Tracking)
- Defers loading of related objects until they are actually needed (Lazy Loading)
- Loads related objects along with the main object (Eager Loading)
- Allows developers to use LINQ queries to interact with the database (Support for LINQ)
Entity Framework Core vs Entity Framework 6
- Entity Framework Core: cross-platform, open-source version of Entity Framework
- Entity Framework 6: closed-source, Windows-specific version of Entity Framework
Entity Framework Core Features
- Supports multiple databases, including SQL Server, MySQL, PostgreSQL, and more (Multi-Provider Support)
- Runs on Windows, Linux, and macOS (Cross-Platform)
- Allows for community contributions and customization (Open-Source)
Entity Data Model
- Entity: a class that represents a table in the database
- Entity Set: a collection of entities
- Navigation Property: a property that represents a relationship between entities
- Entity Container: a top-level container that holds all the entities and their relationships
DbContext
- DbContext: a class that coordinates the interaction between the application and the database
- DbSet: a collection of entities that can be queried and updated
- SaveChanges: a method that saves changes made to the entities to the database
Querying with Entity Framework
- Allows developers to use LINQ to query the database (LINQ Queries)
- Represents a query that can be executed against the database (IQueryable)
- A set of functions that can be used to execute database-specific functions (DbFunctions)
Learn about Entity Framework, an Object-Relational Mapping (ORM) framework for .NET applications. Understand its key features such as SQL generation, change tracking, and lazy loading.
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