using nullable in field descriptor

[Ori Shen]

Hi Folks,

1) Can anybody explain me the purpose of using nullable ?
2) I want a field descriptor to be a nullable, and when using it in a wrong way 
exception
     will be thrown. However, when using the field descriptor badly it inserts a 0 to 
the
     db instead of throwing an exception. what can I do?

thanks in advance



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