RE: Trying To Understand Query Syntax Details
Not sure about the rest, but if you've stored your dates in mmdd format, you can use a RangeQuery like so: dateField:[20011001-null] This would return all dates on or after October 1, 2001. Scott -Original Message- From: W. Eliot Kimber [mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 16, 2001 11:10 AM To: lucene-user Subject: Trying To Understand Query Syntax Details I'm trying to understand the details of the query syntax. I found the syntax ` in QueryParser.jj, but it doesn't make everything clear. My initial questions: - It doesn't appear that ? can be the last character in a search. For example, to match fool and food, I tried to do foo?, but got a parse error. fo?l of course matches fool and foal. Is this a bug or an implementation constraint? - How does one specify a date range in a query? We need to be able to search on docs later than date x, and I know that Lucene supports date matching, but I don't see how to specify this in a query. Also, is there a description of the algorithm ~ uses? Thanks, E. -- . . . . . . . . . . . . . . . . . . . . . . . . W. Eliot Kimber | Lead Brain 1016 La Posada Dr. | Suite 240 | Austin TX 78752 T 512.656.4139 | F 512.419.1860 | [EMAIL PROTECTED] w w w . d a t a c h a n n e l . c o m
Re: Trying To Understand Query Syntax Details
Scott Ganyo wrote: Not sure about the rest, but if you've stored your dates in mmdd format, you can use a RangeQuery like so: dateField:[20011001-null] This would return all dates on or after October 1, 2001. Cool--thanks! E. -- . . . . . . . . . . . . . . . . . . . . . . . . W. Eliot Kimber | Lead Brain 1016 La Posada Dr. | Suite 240 | Austin TX 78752 T 512.656.4139 | F 512.419.1860 | [EMAIL PROTECTED] w w w . d a t a c h a n n e l . c o m
Re: Trying To Understand Query Syntax Details
--- W. Eliot Kimber [EMAIL PROTECTED] wrote: I'm trying to understand the details of the query syntax. I found the syntax ` in QueryParser.jj, but it doesn't make everything clear. My initial questions: - It doesn't appear that ? can be the last character in a search. For example, to match fool and food, I tried to do foo?, but got a parse error. fo?l of course matches fool and foal. Is this a bug or an implementation constraint? Yes and no. Lucene uses two query classes to handle wildcards, namely PrefixQuery and WildcardQuery. To cut the long story short, PrefixQuery, the faster of the two, is expressly optimized for wildcards searches like foo* and foa* but doesn't yet support single character matching like foo?. WildcardQuery, the slower of the two and developed after PrefixQuery was completed, handles general wildcard searches like fo*l as well as fo?l. I'll see what I can do to add single character matching to PrefixQuery over the weekend. - How does one specify a date range in a query? We need to be able to search on docs later than date x, and I know that Lucene supports date matching, but I don't see how to specify this in a query. Try looking at Range Query. Also, is there a description of the algorithm ~ uses? ~ is used to toggle fuzzy search on a single word. Thus the search foam~ will match with terms like foam, form, foal, roam, etc.. __ Do You Yahoo!? Make a great connection at Yahoo! Personals. http://personals.yahoo.com
