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I'm working with Solr and I'd like to know if it is possible to have a LIKE clause in the query. For example, I want to know all organizations with "New York" in the title. In SQL, this would be written like Name LIKE 'New York%'.
My question - how do you write a LIKE query in Solr?
I'm using the SolrNet library, if that makes a difference.
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Solr queries require escaping special characters that are part of the query syntax. Special characters are: +, -, &&, ||, !, (, ), ", ~, *, ?, and : . To escape these characters, use a slash ( \ ) before the character to escape.
Trying a basic queryThe main query for a solr search is specified via the q parameter. Standard Solr query syntax is the default (registered as the “lucene” query parser). If this is new to you, please check out the Solr Tutorial. Adding debug=query to your request will allow you to see how Solr is parsing your query.
You can search for "solr" by loading the Admin UI Query tab, enter "solr" in the q param (replacing *:* , which matches all documents), and "Execute Query". See the Searching section below for more information. To index your own data, re-run the directory indexing command pointed to your own directory of documents.
Standard solr queries use the "q" parameter in a request. Filter queries use the "fq" parameter. The primary difference is that filtered queries do not affect relevance scores; the query functions purely as a filter (docset intersection, essentially).
If you're using solr 3.1 or newer, have a look at the Extended DisMax Query Parser, which supports wildcard queries. You can enable it using <str name="defType">edismax</str> in the request handler configuration.
Then you can use a query like title:New York* with the same behaviour as a query with like clause. The main difference between my answer and the accepted one is that you can even search for fragment of words using wildcards. For example New Yorkers would match in this case.
Unfortunately you could have problems with case-sensitive queries even if you're using a LowerCaseFilterFactory. Have a look here to know more. Most of those problems will be fixed with the solr 3.6 release since the SOLR-2438 issue has been solved.
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You just search for "New York", but first you need to properly configure your field's analyzer. For example you might want to start with a field type like text_general as defined in the default Solr schema. This field type will tokenize on whitespace and other common word separators, then apply a filter of stopwords, then lowercase the terms in order to make searches case-insensitive.
More information about analyzers in the Solr wiki.
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