I think that with "native driver" Naved meant a driver dedicated for that particular RDMS.
Provided you only used the interfaces from the java.sql and javax.sql packages and kept the database specific code limited to the loaded class and connection
String, then the only thing that could break code would be any RDMS specific queries. I've worked with an older Oracle RDMS that didn't support joins the regular way with INNER JOIN and LEFT OUTER JOIN; instead it used a WHERE clause with a (+) after a column to indicate a LEFT or RIGHT OUTER JOIN. For instance,
would translate to
. Unless you have that such an RDMS
you should be just fine.