template <class T, class Storage, class PropClass, class ArrayType = CSimpleArray<Storage>> class CRowsetImpl
Parameters
T
The user’s class that derives from CRowsetImpl.
Storage
The user record class.
PropClass
The class that contains properties for the rowset; typically the command.
ArrayType
The class that will act as storage for the rowset’s data. This parameter defaults to CSimpleArray, but it can be any class that supports the required functionality. See the ATLMTO sample for an example of changing the default array parameter.
CRowsetImpl provides a standard OLE DB rowset implementation without requiring multiple inheritance of many implementation interfaces. CRowsetImpl provides overrides in the form of static upcasts. The methods control the manner in which a given rowset will validate command text. You can create your own CRowsetImpl-style class by making your implementation interfaces multiple-inherited. See the MyProv sample for an example of this technique. The only method for which you must provide implementation is Execute. Depending on what type of rowset you are creating, the creator methods will expect different signatures for Execute. For example, if you are using a CRowsetImpl-derived class to implement a schema rowset, the Execute method will have the following signature:
HRESULT Execute(LONG* pcRows, ULONG cRestrictions, const VARIANT* rgRestrictions)
If you are creating a CRowsetImpl-derived class to implement a command or session’s rowset, the Execute method will have the following signature:
HRESULT Execute(LONG* pcRows, DBPARAMS* pParams)
To implement any of the CRowsetImpl-derived Execute methods, you must populate your internal data buffers (m_rgRowData).
#include < atldb.h >