How to import an empty value(NULL) into database from a file?

Hello, how can I import an empty value into the database from a file.
The filed may be int or string, if I write "NULL" , then I'll read a
string "NULL" from it. I hope that I can get an empty value (Eg, an
empty string whose size() is zero in Qt).

How can I do ?
Thanks.

Kermit

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