Lucene integer Range search

6sic6 · **Joined:** Thu Apr 20, 2006 11:51 am **Posts:** 44

Hi all
I need to give a range from [80 TO 100] to Lucene
it's not working.. seems to convert these as strings.
how can I solve this prob
thanks

sanne.grinovero · **Posted:** Wed May 21, 2008 11:21 am

Quote:

it's not working.. seems to convert these as strings.

yes, you are right: eveything in the lucene index is a String, and sorting uses "lexicographic sorting".

So Hibernate Search converts numbers and dates to Strings correctly padding a number of "0", you may use org.hibernate.search.bridge.BridgeFactory's public constants as helpers to correctly define the rangequery...

sanne.grinovero · **Posted:** Wed May 21, 2008 11:34 am

I'm sorry I was wrong in my previous post, looking at the source I've found it's not true
Hibernate Search automatically pads "0" to numbers.

I should add that even if you indexed all numbers correctly a RangeQuery could be dangerous, especially if you have many possible different values,
look for "Why am I getting a TooManyClauses exception?"
in the Lucene FAQ:
http://wiki.apache.org/lucene-java/LuceneFAQ

If you are aware of the dangers of a RangeQuery but still want to use it you should implement your own StringBridge, and use org.apache.lucene.document.NumberTools.