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Writing a Lucene query
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Parsing and the QueryParser syntax The QueryParser and user-friendly query entry Tokenization and analyzers Lucene s base Query classes
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You ve purchased something online. Maybe it s a book or clothing from a department store with an online presence. Your order is a week overdue, so you go back to the website to check its status, but you ve misplaced the order number. You call the contact number and are told, I m sorry, I can only look up your order if you can give me your Order ID. Oh-oh, does this sound familiar These all-or-nothing database-style searches are quickly being overtaken by the search techniques we discuss in this book. These much more flexible methods can query for a document where the title contains Wright Brothers and the body contains bicycle. Just about any way you can think of searching for something can be converted into a data query.
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Writing a Lucene query
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Information indexing is a standard, rigid process, but querying that gathered information can be performed in myriad ways. This process and the building of these queries is the subject of this chapter. We ll begin by studying the QueryParser, how it parses expressions and allows for user-friendly queries and the syntax it generates from our queries. Understanding this syntax is important when you run into problems. What could possibly be wrong if you query for a person s last name such as Smith-Jones and obtain no results when you re positive the name exists in the index Then we ll move on to a discussion of analyzers and how they extract and manipulate queries. Finally, we ll look at the types of queries that are provided out of the box and how to use and manipulate them for our needs. Parsing an expression is the process of analyzing a sequence of tokens in Lucene s case, words and transforming them into some predefined data structure suitable for later processing. Lucene contains the class org.apache.lucene.queryParser.QueryParser which performs this function through its parse(String query) method. The output of this method can be anything from a single-term expression to a complicated phrase depending on the complexity of the query. Before we get into parsing too deeply, it s important to understand the syntax that the parser generates in these phrases. This will help you understand why things turn out the way they do and point out what changes may be necessary. The next section introduces the query parser syntax. For a full discussion of it refer to the document located at lucene_install_directory/docs/queryparsersyntax.html. Also remember that Manning s Lucene in Action is an excellent additional reference for the various discussions in this chapter.
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Understanding Lucene s query syntax
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Let s face it. Queries can be as simple as a single word and as complicated as a multiword, nested Boolean expression with a range query added on, and so on, up to the limits of your imagination. A semi-mathematical style of notation can make things a little easier to understand, and that s what Lucene uses. A small set of special characters can convey a lot of information accurately. Understanding the query syntax is of the utmost importance if you re going to troubleshoot a query that didn t produce expected results. Is the problem in the index or the query You don t want to waste time barking up the wrong tree. Our old friend Luke, introduced in chapter 2, is excellent for showing exactly how your entered query will be parsed into a Lucene-usable expression and is an outstanding troubleshooting tool for use with query parsing. We ll be utilizing it here to demonstrate parsing, and we recommend you use it often when developing so you have a minimum of surprises.
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