Container/File operations, such as createContainer, getContainers, getFiles, upload, download, deleteFile, deleteContainer.create, retrieve, update, and delete methods, such as create, find, findById, deleteAll, updateAll, count.Different types of connectors implement different interfaces that group a set of common methods, for example: To mix-in methods onto model classes, a connector must choose what functions to offer. Connector-specific model/property mappings.What data access interfaces are implemented by the connector (the capability of the connector).Model definition for the configuration, such as host/URL/username/password.Delegating model method invocations to backend calls, for example create, retrieve, update, and delete.disconnect: close connections to the backend system.connect: create connections to the backend system.initialize: receive configuration from the data source settings and initialize the connector instance.Most connectors need to implement the following logic: Their functions are mixed into model classes through data source attachments. The connectors are mostly transparent to models. Oracle, SQL Server, MySQL, Postgresql, MongoDB, In-memory DB.Databases that support full create, retrieve, update, and delete operations.There are a few typical types of connectors based on what backends they connect to and interact with. Provide reusable logic to interact with another system.Integrate with a backend such as databases.Such as drivers or clients to your backend. The custom methods can be implemented using other Node modules, You can use custom methods on a model to provide ad-hoc integration. You don’t always have to develop a connector to enable your application to interact with other systems. The following diagram illustrates how connectors fit into the LoopBack API framework. For example, a model automatically receives the create, retrieve, update,Īnd delete (CRUD) functions when attached to a data source for a database. So application developers don’t have to implement them. One of the powerful features of LoopBack is that connectors provide most common model behaviors “out of the box”, LoopBack models encapsulate business data and logic as JavaScript properties and methods. LoopBack abstracts the backend persistence layer as data sources that can be databases, or other backend services such as REST APIs, SOAP web services, storage services, and so on.Įach data source is backed a connector that implements the interactions between Node.js and the underlying backend system.Ĭonnectors are responsible for mapping model methods to backend functions, such as database operations or calls to REST or SOAP APIs. ![]() Understand a connector’s responsibilities However, many of the concepts also apply to creating a connector to other types of data sources. It walks you through the MySQL connector implementation to teach you how to develop a connector for relational databases. This article is for developers who want to create a new connector type to connect to a data source not currently supported.
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