CRowset::MoveToRatio

Fetches rows starting from a fractional position in the rowset.

HRESULT MoveToRatio( 
   DBCOUNTITEM nNumerator, 
   DBCOUNTITEM nDenominator, 
   bool bForward = true  
) throw( );

Parameters

• nNumerator
  [in] The numerator used to determine the fractional positional from which to fetch data.

• nDenominator
  [in] The denominator used to determine the fractional positional from which to fetch data.

• bForward
  [in] Indicates whether to move forward or backward. The default is forward.

Return Value

A standard HRESULT.

Remarks

MoveToRatio fetches rows according roughly to the following formula:

( nNumerator * RowsetSize ) / nDenominator

where RowsetSize is the size of the rowset, measured in rows. The accuracy of this formula depends on the specific provider. For details, see IRowsetScroll::GetRowsAtRatio.

This method requires the optional interface IRowsetScroll, which might not be supported on all providers; if this is the case, the method returns E_NOINTERFACE. You must also set DBPROP_IRowsetScroll to VARIANT_TRUE before calling Open on the table or command containing the rowset.

Requirements

Header: atldbcli.h

See Also

Concepts

CRowset Class

CRowset Members