How does the ORM framework work in C#?
The principle of ORM (Object-Relational Mapping) framework in C# is to establish a mapping relationship between the object model and the relational database, allowing developers to interact with the database in an object-oriented manner.
The specific working principle is as follows:
- Developers use configuration files or annotations provided by ORM frameworks to specify the mapping relationship between object models and database tables. This involves defining the correspondences between classes and tables, properties and fields, as well as the relationships between them.
- Developers can use the API provided by the ORM framework to perform database operations such as querying, inserting, updating, and deleting. The ORM framework will convert the operations submitted by developers into corresponding SQL statements and execute them on the database.
- Object-relational mapping: ORM framework converts database query results into corresponding objects and persists objects into the database. This allows developers to directly access data by manipulating objects without the need to manually write SQL statements.
- Transaction Management: ORM frameworks typically offer transaction management functionality, which ensures the consistency and integrity of database operations. Developers can utilize the transaction management API provided by the framework to start, commit, or rollback transactions.
- Cache Mechanism: In order to improve performance, ORM frameworks typically offer a cache mechanism to store frequently accessed data in memory, reducing the number of times the database is accessed.
In summary, the working principle of ORM framework involves functions such as mapping configuration, data querying and persistence, object-relational mapping, transaction management, and caching mechanism to interact between object models and relational databases, simplifying the work of developers and increasing development efficiency.
