code: public void setAutoVersioningEnabled(boolean enabled, String className) {
          if (mAutoVersioningMap == null) {
              mAutoVersioningMap = new HashMap<String, Boolean>();
          }
          mAutoVersioningMap.put(className, enabled);
      }
docs: By default, JDBCRepository assumes that {@link
  com.amazon.carbonado.Version version numbers} are initialized and
  incremented by triggers installed on the database. Enabling automatic
  versioning here causes the JDBCRepository to manage these operations
  itself.
  
  @param enabled true to enable, false to disable
  @param className name of Storable type to enable automatic version
  management on; pass null to enable all
  @since 1.2