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For 2013 when we read a null value then it won't be an empty value,the attribute will be missing entirely.That's why the Tester lets you test for Missing.Actually if you set it to test for Null,it will just test for missing too.
Again in 2013 you can't set a null value in an attribute.But if the attribute is missing when it is written then that would probably force a null in a database.For non-databases it would be format dependent (eg in MapInfo I think we write -9999,which is the MapInfo equivalent to Null).
In 2014 we support nulls properly.The beta build is online if you want to try it.We'll read a value as null and the Tester will now test for null values (and give a different result to testing for Missing).Many other transformers have been updated to use and account for null values.
Similarly we'll now write nulls directly to a dataset/database.
The new NullValueMapper is the transformer that you can use to set features as null or not.
You can find more info on fmepedia (http://fmepedia.亚搏在线safe.com/articles/FAQ/How-does-FME-handle-Null-attribute-values) and I'll be writing an FME Evangelist blog post shortly to explain all the 2014 updates.
Hope this helps.I'm really looking forward to 2014 being out there and our customers getting to use the null functionality,
Regards
马克
Mark Ireland
Product Evangelist
亚搏在线Safe Software Inc.
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