Returns nonzero if the recordset has been positioned before the first record. There is no current record.
Call this member function before you scroll from record to record to learn whether you have gone before the first record of the recordset. You can also use IsBOF along with IsEOF to determine whether the recordset contains any records or is empty. Immediately after you call Open, if the recordset contains no records, IsBOF returns nonzero.When you open a recordset that has at least one record, the first record is the current record and IsBOF returns 0.
If the first record is the current record and you call MovePrev, IsBOF will subsequently return nonzero. If IsBOF returns nonzero and you call MovePrev, an error occurs. If IsBOF returns nonzero, the current record is undefined, and any action that requires a current record will result in an error.
This example uses IsBOF and IsEOF to detect the limits of a recordset as the code scrolls through the recordset in both directions.
// Open a recordset; first record is current CCustSet rsCustSet( NULL ); rsCustSet.Open( ); if( rsCustSet.IsBOF( ) ) return; // The recordset is empty // Scroll to the end of the recordset, past // the last record, so no record is current while ( !rsCustSet.IsEOF( ) ) rsCustSet.MoveNext( ); // Move to the last record rsCustSet.MoveLast( ); // Scroll to beginning of the recordset, before // the first record, so no record is current while( !rsCustSet.IsBOF( ) ) rsCustSet.MovePrev( ); // First record is current again rsCustSet.MoveFirst( );