I believe, but I'm not sure, that query and newQuery
are not guaranteed to be equivalent. So I'd be cautious
about this approach. But if it works for you....
I'm assuming that you're somehow programmatically
constructing the query and therefore can't just
store the original string. I'd *always* store the
original rather than a processed query if I could,
just on general principles.
What is it that you're trying to accomplish anyway?
Perhaps there's a better approach....
Erick
On Jan 17, 2008 6:07 AM, prabin meitei <[EMAIL PROTECTED]> wrote:
> Hi Erick,
> Thanks for your response. I have tried the folowing way and seems to be
> working. Tell me if there is any problem with the approach.
>
> String str = query.toString();
> QueryParser parser = new QueryParser("", new StandardAnalyzer);
> Query newQuery = parser.parse(str);
>
> now use *newQuery* for making queries
>
>
> I understand that in the constructor of QueryParser it takes default field
> and a analyzer. If I put a blank field it seems to work. Putting null
> gives
> a null pointer exception.
>
> Regards,
> Prabin
>
>
>
> On Jan 16, 2008 7:44 PM, Erick Erickson <[EMAIL PROTECTED]> wrote:
>
> > As I remember from various threads, toString is more of
> > a debugging aid and you cannot completely rely on the
> > transformation from a parsed query -> tostring -> parsed query
> > to be reliable. But this is "something I remember", so take
> > it with a grain of salt (you might want to search the mail
> > archive to see if my memory is correct).
> >
> > That said, use BooleanQuery to add as many clauses in
> > as many ways as you want.
> >
> > Actually, I don't know how I'd go about storing a programmatically
> > constructed query, I'd sure like to know if there's a way. You could
> > certainly store the original query if you were taking user input and
> > parsing it...
> >
> > Best
> > Erick
> >
> > On Jan 16, 2008 4:22 AM, prabin meitei <[EMAIL PROTECTED]> wrote:
> >
> > > Hi ,
> > > I want to construct a query from string. how can I do it??
> Actually
> > i
> > > saved a query(a boolean query) as string (using query.toString()).
> > > Is there a way to reconstruct the query from the string i saved? How
> can
> > i
> > > add more clauses to the reconstructed query?
> > > Thanks in advance.
> > >
> > > Prabin
> > >
> >
>
