Provides an implementation of the IAccessor interface.

template <class T,
   class BindType = ATLBINDINGS,
   class BindingVector = CAtlMap <HACCESSOR hAccessor, BindType* pBindingsStructure>>
class ATL_NO_VTABLE IAccessorImpl : public IAccessorImplBase<BindType>

T
Your rowset or command object class.

BindType
Storage unit for binding information. The default is the ATLBINDINGS structure (see atldb.h).

BindingVector
Storage unit for column information. The default is CAtlMap where the key element is an HACCESSOR value and the value element is a pointer to a BindType structure.

Header: atldb.h

This is mandatory on rowsets and commands. OLE DB requires providers to implement an HACCESSOR, which is a tag to an array of DBBINDING structures. HACCESSORs provided by IAccessorImpl are addresses of the BindType structures. By default, BindType is defined as an ATLBINDINGS in IAccessorImpl's template definition. BindType provides a mechanism used by IAccessorImpl to track the number of elements in its DBBINDING array as well as a reference count and accessor flags.

The constructor.

IAccessorImpl();

Adds a reference count to an existing accessor.

STDMETHOD(AddRefAccessor)(HACCESSOR hAccessor,
   DBREFCOUNT* pcRefCount);

See IAccessor::AddRefAccessor in the OLE DB Programmer's Reference.

Creates an accessor from a set of bindings.

STDMETHOD(CreateAccessor)(DBACCESSORFLAGS dwAccessorFlags,
   DBCOUNTITEM cBindings,
   const DBBINDING rgBindings[],
   DBLENGTH cbRowSize,
   HACCESSOR* phAccessor,
   DBBINDSTATUS rgStatus[]);

See IAccessor::CreateAccessor in the OLE DB Programmer's Reference.

Returns the basic columns bindings from the consumer in an accessor.

STDMETHOD(GetBindings)(HACCESSOR hAccessor,
   DBACCESSORFLAGS* pdwAccessorFlags,
   DBCOUNTITEM* pcBindings,
   DBBINDING** prgBindings);

See IAccessor::GetBindings in the OLE DB Programmer's Reference.

Releases an accessor.

STDMETHOD(ReleaseAccessor)(HACCESSOR hAccessor,
   DBREFCOUNT* pcRefCount);

See IAccessor::ReleaseAccessor in the OLE DB Programmer's Reference.

OLE DB Provider Templates
OLE DB Provider Template Architecture