How set null to integer or long field

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I have a problem with setting DB field which is of type INTEGER or BIGINT.

It is imposible to set this field with DO object to null value. (0 is 
saved instead of null) - because it accepts java int (long) types only.
It is also imposible to get null value from this field. (0 is return) - 
because it gets java int (long) types only.

So is there a way how to set or get a value of null for DB fields of 
type INTEGER or BIGINT?

Thank you for your help.


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