if (sdbdh == null) {
JDBC.loadDriverDerby() ;
String url = JDBC.makeURL("derby", "localhost", "DB/test2-hash") ;
SDBConnection sdb = new SDBConnection(url, null, null) ;
StoreDesc desc = new StoreDesc(LayoutType.LayoutTripleNodesHash, DatabaseType.Derby) ;
sdbdh = new StoreTriplesNodesHashDerby(sdb, desc);
sdbdh.getTableFormatter().create();
}