UltraLite Embedded SQL User's Guide
Embedded SQL Library Functions
void ULRevokeConnectFrom( SQLCA * sqlca, ul_char * userid );
Revoke access from an UltraLite database for a user ID.
sqlca A pointer to the SQLCA.
userid Character array holding the user ID to be excluded from database access. The maximum length is 16 characters.
Adding user authentication to your application