What is Storage Model?

In the context of Entity Framework (EF), the “Storage Model” refers to the representation of the underlying database schema in the Entity Framework framework. It is one of the three main components of the Entity Data Model (EDM), which is the conceptual model used by Entity Framework to map and interact with data.

The three main components of the Entity Data Model (EDM) are:

  1. Conceptual Model: This represents the application’s domain model, which consists of entity classes, their properties, and the relationships between entities. The conceptual model is defined using classes in your application code.
  2. Storage Model: This represents the actual database schema where the data is stored. The storage model defines database tables, columns, primary keys, foreign keys, and other database-specific details.
  3. Mapping: The mapping layer connects the conceptual model to the storage model. It defines how the entities and their properties are mapped to the corresponding database tables and columns.

When you work with Entity Framework, you define the conceptual model using classes in your application. These classes represent entities, and their properties represent the columns in the database. The conceptual model is created using the Code-First or Database-First approach.

On the other hand, the storage model is typically generated automatically based on the existing database schema if you are using the Database-First approach. Alternatively, if you are using the Code-First approach, Entity Framework can generate the database schema based on the classes and relationships you define in the conceptual model.

The mapping layer is responsible for establishing the connections between the conceptual model and the storage model, ensuring that data is correctly persisted to and retrieved from the database.

In summary, the storage model in Entity Framework is the representation of the actual database schema where the data is stored, and it is one of the essential components that allow EF to bridge the gap between the object-oriented domain model and the relational database.

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