> As the title.
In fact, it is not empty but not implemented at all. I have filed a [https://sourceforge.net/tracker/index.php?func=detail&aid=2186643&group_id=132964&atid=725711|patch].
> I need to reuse the statement,is there another way to do?
In current release, unfortunately no. You can execute the statement multiple times, but you can not redefine the underlying SQL. I have filed [https://sourceforge.net/tracker/index.php?func=detail&aid=2186639&group_id=132964&atid=725712|feature request] for the next release (which, I hope, will be out before the end of this year).
Thanks for the report.