* otherwise the connection will be disconnected once the usage drops to zero.
     *
     * @param np
     *            whether to use an exclusive connection
     */
    void setNonPooled(final boolean np) {
        this.nonPooled = np;
    }

    /**
     * @return the currently connected tid
     */
    @SuppressWarnings("resource")
    public long getTreeId() {