| 321 | | At FdoISelect::Execute time a feature reader will be returned, even though there might be cases when the join class returned by the reader will not contain a primary key or a geometry property. In cases where select commands do not provide a property selection list, all properties can be added to the feature class reader built at runtime. In cases where users request a subset of properties, only those properties will be added to the feature class, even if that means the returned feature class might then contain no identity properties or geometry properties. This behavior will be implemented due to the fact that a feature reader, even one that does not contain primary key or geometry properties, is very useful in applications. In the worst case, a provider implementation can add all identity properties from the selected classes to the resulting identity property list of the joined class definition. Also, in case there is no way to return an identity property, providers can add a non-identity property to the identity property collection of the returned class as a shortcut to allow a primary property to be defined. NOTE that the returned class will be read-only since there is no way to know if the resulting class can be updated. |
| | 321 | At FdoISelect::Execute time a feature reader will be returned, even though there might be cases when the join class returned by the reader will not contain a primary property or a geometry property. In cases where select commands do not provide a property selection list, all properties should be added to the feature class reader built at runtime. In cases where applications request a subset of properties, only those properties should be added to the feature class, even if that means the returned feature class might then contain no identity properties or geometry properties. In the worst case, a provider implementation can add all identity properties from the selected classes to the resulting identity property list of the joined class definition. Also, in case there is no way to return an identity property, providers can add a non-identity property to the identity property collection of the returned class as a shortcut to allow a primary property to be defined. (NOTE that the returned class will be read-only since there is no way to know if the resulting class can be updated.) |
