Property group: Rowset
Property set: DBPROPSET_ROWSET
Typical R/W: R
Description: Hidden Column Count
If DBPROP_UNIQUEROWS is VARIANT_TRUE, the DBPROP_HIDDENCOLUMNS property returns the number of additional "hidden" columns added by the provider to uniquely identify rows within the rowset. These columns are returned by IColumnsInfo::GetColumnInfo and IColumnsRowset::GetColumnsRowset. However, they are not included in the count of rows returned by the pcColumns argument returned by IColumnsInfo::GetColumnInfo.
To determine the total number of columns represented in the prgInfo structure returned by IColumnsInfo::GetColumnInfo, including hidden columns, the consumer adds the value of DBPROP_HIDDENCOLUMNS to the count of columns returned from IColumnsInfo::GetColumnInfo in pcColumns. If DBPROP_UNIQUEROWS is VARIANT_FALSE, DBPROP_HIDDENCOLUMNS is zero.