CreateResolver is called automatically when a resolver is needed to implement one of the provider's methods. CreateResolver returns a newly instantiated resolver object, which is assigned to the Resolver property. The type of resolver created depends on the ResolveToDataSet property: 

When ResolveToDataSet is true, CreateResolver returns a TDataSetResolver component, which applies updates directly to the dataset specified by the DataSet property. 

When ResolveToDataSet is false, CreateResolver returns a TSQLResolver component, which applies updates directly to the database server associated with DataSet. 

Resolver 

ResolveToDataSet