Updating disconnected datasets dating cohabitation and marriage
In Lesson 3, we discussed a fully connected mode of operation for interacting with a data source by using the Sql Command object.In Lesson 4, we learned about how to read data quickly an let go of the connection with the Sql Data Reader.Although it looks 'connected' to your database I can expand your example a little bit to make clear that 'connected' is relative.It is better to talk about dependency amd the Data Set only depends on a Data Adapter.The term disconnected is used to convey its design property that it doesn't need a live database connection.You Fill your Dataset, make changes to it, Save the dataset to disk, stop your application, a day later start your application, Read the dataset from disk and write the changes to you made yesterday to a datastore using an The connection string contains information such as the name of the data source and its location, and authorization credentials and settings.
Figure 1 illustrates the overall architecture of ADO. An OLE DB provider implements COM interfaces, and a . This single provider offered access to a wide array of data sources to any data source with an ODBC driver. Thus, any data source with an OLE DB provider can be accessed through ADO. The Sql Server data provider uses the native SQL Server wire protocol.It provides a method to retrieve data into a disconnected object and a method to reconcile modified data in the disconnected object with the data source. If you get down to implementation details everything looks/is connected.This makes it ideal as the return vehicle from business-tier objects and Web services.A Data Reader cannot be serialized and thus cannot be passed between physical-tier boundaries where only string (XML) data can go.