MDAC 2.5 SDK - ODBC Programmer's Reference
Appendix F: ODBC Cursor Library

Cursor Library Cache

For each row of data in the result set, the cursor library caches the data for each bound column, the length of the data in each bound column, and the status of the row. The cursor library uses the values in the cache both to return through SQLFetch and SQLFetchScroll and to construct searched statements for positioned operations. For more information, see "Constructing Searched Statements," later in this appendix.