UltraLite User's Guide
C++ API Reference
ULCursor class
int SetColumNull( ul_column_num column-index )
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-index The number of the column. The first column in the table has a value of one.
true (1) if successful.
false (0) if unsuccessful.
SetNull<Column> generated method