UltraLite Static C++ User's Guide
C++ API Reference
Generated result set class
bool SetNullcolumn-name( )
Sets a column to the SQL NULL. The data is not actually changed until you execute an Insert or Update, and that change is not permanent until it is committed.
column-name A generated name derived from the name of the column in the reference database.
true (1) if successful.
false (0) if unsuccessful.