On Friday 28 March 2003 15:48, Shah, Vineel wrote:
> One of my clients is asking for an old-style boolean query search on my
> keywords fields. A string might look like this:
>
> "oracle admin*" and java and oracle and ("8.1.6" or "8.1.7") and
> ("solaris" or "unix" or "linux")
>
> There would probably be need for nested parenthesis, although I can't think
> of an example. Is there a parser I can plug into lucene to make this
> happen? It doesn't seem like the normal QueryParser class would like this
> string, or would it? Any ideas or comments would be appreciated. Making my
Actually I think it should, as long as you change 'and' to 'AND' and 'or' to
'OR' (upper case versions are used, I think, to make it less likely user
meant to match words 'and' and 'or'?).
> own grammar and parser class is too expensive a proposition.
Well, writing simple grammar and parser is fairly easy to do, if you've ever
used java_cup or javacc (or just (b)yacc / bison), shouldn't take all that
long since all actual query classes already exist. But I don't think you need
to do even that. :-)
The only feature that might need some additional work is matching "oracle
admin*"; PhrasePrefixQuery allows doing something like that, but it's not
integrated with QueryParser (I think it probably should, and might be quite
easy to do).
-+ Tatu +-
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