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Provides an implementation of the IColumnsInfo interface.
Syntax
template <class T>
class ATL_NO_VTABLE IColumnsInfoImpl :
public IColumnsInfo,
public CDBIDOps
Parameters
T
Your class, derived from IColumnsInfoImpl.
Requirements
Header: atldb.h
Members
Methods
| Name | Description |
|---|---|
| GetColumnInfo | Returns the column metadata needed by most consumers. |
| MapColumnIDs | Returns an array of ordinals of the columns in a rowset that are identified by the specified column IDs. |
Remarks
A mandatory interface on rowsets and commands. To modify the behavior of your provider's IColumnsInfo implementation, you need to modify the provider column map.
IColumnsInfoImpl::GetColumnInfo
Returns the column metadata needed by most consumers.
Syntax
STDMETHOD (GetColumnInfo)(DBORDINAL* pcColumns,
DBCOLUMNINFO** prgInfo,
OLECHAR** ppStringsBuffer);
Parameters
See IColumnsInfo::GetColumnInfo in the OLE DB Programmer's Reference.
IColumnsInfoImpl::MapColumnIDs
Returns an array of ordinals of the columns in a rowset that are identified by the specified column IDs.
Syntax
STDMETHOD (MapColumnIDs)(DBORDINAL cColumnIDs,
const DBID rgColumnIDs[],
DBORDINAL rgColumns[]);
Parameters
See IColumnsInfo::MapColumnIDs in the OLE DB Programmer's Reference.
See also
OLE DB Provider Templates
OLE DB Provider Template Architecture