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Data Access Layer
The data access layer is responsible for all outgoing connections to access and process data. This is mainly about accessing data from a persistent data-store but also about invoking external services.
This layer is implemented using providers. Those providers could be: services, repositories and others. Although services can be used for this layer, they should not be confused with the service layer. Services in this layer are responsible for data access, while services in the service layer are responsible for business logic.
Database
We strongly recommend TypeORM for database management in devon4node applications. Although services can be used for this layer, they should not be confused with the service layer. Services in this layer are responsible for data access, while services in the service layer are responsible for business logic. TypeORM supports the most commonly used relational databases, link Oracle, MySQL, MariaDB, PostgreSQL, SQLite, MSSQL and others. Also, it supports no-relational databases like MongoDB.
TypeORM supports Active Record and Repository patterns. We recommend to use the Repository pattern. This pattern allows you to separate the data objects from the methods to manipulate the database.
External APIs
In order to manage the data in a external API, you need to create a service for that purpose. In order to manage the connections with the external API, we strongly recommend the NestJS HTTP module