Implementing a Custom Connection
A connection is an abstraction of a physical link between the data provider and the source of the data itself. In most cases, that means a network connection between the client application code and the database server code (such as a TCP/IP connection on port 1560 for SQL Server, and the like).
In the case of this sample remote data provider, the connection is an implied or logical connection rather than a physical connection. As you know, HTTP is a stateless protocol. When you request information from a web server, the connection is opened at the time of the request, not ahead of time as with database connections.
For this reason, the connection being implemented is just a storage place for the connection string, ...
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