This may actually be an issue we need to address: https://www.ibm.com/support/knowledgecenter/en/SSEPGG_9.5.0/com.ibm.db2.luw.wn.doc/doc/c0052012.html

That lists all of the JDBC 4.0 support added as of DB2 9.5. Notice they omit any `N*` variants - no setNClob, etc

For DB2 maybe we need to treat these via setString, setClob, etc rather than setNString, setNClob, etc