Using variable in a where clause

One way to do this is:

Create a user parameter (in the Navigator window): LAST_OID.

That parameter will be prompting for a value if you use the Prompt and Run option.

Then the WHERE in the reader will be:

OID > $(LAST_OID)

Another (and maybe better option if you are writing to a database table) option is:

Use a SQLCreator transformer with SQL statement: Select max(OID) as maxoid from <table>

Then use the maxoid in a WHERE clause in the FeatureReader (a transformer that acts as a reader), but then with: OID > @Value(maxoid)

I prefer the second option, because it eliminates the manual entry of the last OID.

Hope this helps.

You could use a Sorter + Sampler to send a single Initiator Feature with the Last OID previoulsy read to FeatureReader to do this: