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Entity Framework introduction in .NET - StudySection

Entity Framework is described as an ORM (Object Relational Mapping) framework that provides an automatic mechanism for developers to store and access the information from the database.

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Entity Framework introduction in .NET - StudySection

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  1. Entity Framework introduction in .NET www.studysection.com

  2. Entity Framework introduction in .NET Entity Framework is described as an ORM (Object Relational Mapping) framework that provides an automatic mechanism for developers to store and access the information from the database. It is the primary source of interaction between .NET applications and relational databases. Entity Framework consists of a variety of tools that simplify mapping between objects in your software to the tables and columns of a computer database. ORM automatically creates classes supported database tables or vice-versa i.e. it can even automatically generate necessary SQL to form database tables supported classes.

  3. Use of Entity Framework • It is to extend the developer’s productivity by reducing the redundant task of persisting the info used in the applications. • Entity Framework can generate the required database commands for reading or writing data within the database and execute them. • If you’re querying, you’ll be able to express your queries against your domain objects using LINQ to entities. • It will execute the relevant query within the database to materialize results into instances of your domain objects for you to figure within your app.

  4. The architecture of Framework consists of the following: Data Providers: Data providers are source-specific, that abstract interfaces are attached to connect the database when programming against the conceptual schema. It translates SQL languages like LINQ by command tree to the native System Query Language expressions and then executes them against the particular DBMS system. Entity Client: It is a data provider used by entity framework applications to access the data, this layer exposes the entity layer to the upper layer. Entity client provides the flexibility for developers to figure against entities within the style of rows and columns using entity SQL queries without the necessity to get classes to represent conceptual schema. Entity Client represents the core functionality layers of the entity framework

  5. The architecture of Framework consists of the following: Object Service: The Object Services enables to work with entities such as memory objects. It is the Object Context, that represents the session of interaction between the data source and applications. Article Context is used to perform different operations like add, delete instances of entities, and save lots of the changed states back to the database with the assistance of queries. ORM layer shows the result to the instances of entities. It allows developers to use various ORM features like primary key mapping, change tracking, etc. by writing queries using Entity SQL or LINQ.

  6. Entity Data Model: The Entity Data Model (EDM) specifies (CSDL) the conceptual model and an extended version entity-relationship model. It also refers to a collection of concepts that describe the data structure of the system, no matter its stored form. The model uses three core parts of EDM. Storage Schema Model: The Storage Model is a database design which is also called SSDL (Storage Schema Definition Layer) which represents a schematic representation of backend data. Conceptual Model: The Conceptual Model contains the model classes and is also called Conceptual Schema Definition Layer (CSDL) is that the real entity model, against which we write our queries. Mapping Model: The mapping layer consists of information that is simply a mapping between the Conceptual model and also the Storage model. Mapping of logical and physical schema is represented as an EDM(Entity Data Model).

  7. Relationships In RDBMS or relational databases, the relation is said to exist between different tables through the defined foreign keys. There are mainly 3 forms of relationships between tables which also depend on how the related columns are being constructed. In the framework, these relationships can also be created through code. One-to-Many Relationship Many-to-Many Relationship One-to-One Relationship

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