Enhancing the Simple Read-Only Provider

This section shows how to enhance the simple read-only provider created in the previous section. IRowsetLocateImpl creates an implementation for the IRowsetLocate interface and adds bookmark support for you.

When you have a working provider, you might want to enhance it to make the provider update, handle transactions, or enhance the performance of the row-fetching algorithm. Most provider enhancements involve adding an interface to an existing COM object.

The example in the following topics enhances the row-fetching mechanism by adding the IRowsetLocate interface to CAgentRowset. The topics show you how to:

• Make RCustomRowset inherit from IRowsetLocate.

• Dynamically determine the columns returned to the consumer.

See also

Creating a Simple Read-Only Provider