posted 20 years ago
Thank at first.
Let me make my question clear.
before inserting a new record into the data file, it needs to check if there already exists the duplicated record, eg, it needs to insert the record, the string array values like("a","","","d"); and in the data file, there has one record like, the string array values is,("a","",null,"d"), so, do I need to take them as the duplicated record? (and when writing the record data into the data file, should all the null values in the record data be regarded as ""?)
Thanks!
Frank