Updating disconnected datasets

20-Sep-2019 10:02

When your preparing to edit a row the Begin Edit method should be called on the Data Row object.

The End Edit method then can be used to save the changes back to the Data Set, Cancel Edit provides an undo facility.

I have found this is often the most confusing part of the ADO.

NET spec because users think each side should be able to directly communicate. NET Data Set for example does not ever communicate directly with the database.

You must still commit the changes back to the database in order to store them permanently. Conditions such as unique are applied through this class.

Constraint objects are maintained through the Data Tables Constraints collection.

Any changes you make to a Data Set only exist in RAM.

This allows you to define how the data for this column is calculated.The objects located in the disconnected half of the model do not communicate directly with the connected objects.This is a big deal because it means each side is isolated through interfaces to communicate.You can store the results of a query in a Data Table by calling the Adapters Fill method.Once the Data Table is filled the database connection is released and operates disconnected only.

This allows you to define how the data for this column is calculated.The objects located in the disconnected half of the model do not communicate directly with the connected objects.This is a big deal because it means each side is isolated through interfaces to communicate.You can store the results of a query in a Data Table by calling the Adapters Fill method.Once the Data Table is filled the database connection is released and operates disconnected only.Caching the data on the local machine is vital to performance of the application.