Shulou(Shulou.com)05/31 Report--

This article mainly introduces "what are the search types of Lucene". In the daily operation, I believe many people have doubts about the search types of Lucene. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the questions of "what are the search types of Lucene?" Next, please follow the editor to study!

"Lucene has many ways to query, such as TermQuery, BooleanQuery, PhraseQuery, TermRangeQuery and a series of searches based on different types of phrases. When querying, you can choose the appropriate query method to query documents. For example, numerical types can be queried by TermRangeQuery."

An overview of query methods

TermQuery (entry search) entry search is based on the way a single word is searched. Term represents individual words, while in the Chinese context, it represents individual words (words after word segmentation). For example, query a document that contains PHP in its title.

Query query = new TermQuery (new Term ("title", "PHP"))

BooleanQuery (combined search) BooleanQuery is a Query that combines multiple query conditions, such as merging TermQuery to implement documents that contain PHP in the query title and PHP in the content.

BooleanQuery query = new BoolQuery ()

Query.add (new TermQuery (new Term ("title", "PHP")

Query.add (new TermQuery (new Term ("content", "PHP")

PhraseQuery (phrase search) phrase queries provide queries similar to multiple keywords, with Term entering only one word and PhraseQuery querying a set of words. For example, querying that PHP is the best language in the world will give you the relevant documents. PhraseQuery also has a special feature, that is, slop,slop refers to the maximum allowed interval between two items. For example, we enter the query conditions for the world, language, may be missing in the middle, the best, can not be retrieved. So if we want to retrieve the results, we need to set slop.

PhraseQuery query = new PhraseQuery ()

Query.add (new Term ("title", "World"))

Query.add (new Term ("title", "language"))

Query.setslop (x); / / allowable span or interval

PrefixQuery (prefix query) prefix query is similar to the SQL LIKE "PHP%" we often write for matching query. To put it simply, it is to query through prefix words.

PrefixQuery query = new PhrefixQuery (new Term ("title", "PHP"))

FuzzyQuery (fuzzy query) fuzzy query, which realizes a kind of retrieval based on editing distance similarity. The approximate meaning of the editing distance algorithm is the minimum distance from one phrase to another.

FuzzyQuery query = new FuzzyQUery ("title", "PHP")

RegexpQuery (regular expression query) believes that regular expressions are known to all. Lucene implements regular expression retrieval based on phrases.

RegexQuery query = new RegexQuery (new Term ("title", ". * PHP.*"))

TermRangeQuery () TermRangeQuery implements the range query of a string, so since the scope also has the range retrieval in the string, it is actually the retrieved ASCII value. But in fact, there are not many Chinese scenes that compare ASCII codes. (I've only used regular matching), which is probably familiar with. The constructor is TermRangeQuery (String field, String lowerTerm, String upperTerm, boolean includeLower, boolean includeUpper).

TermRangeQuery query = new TermRangeQuery ("title", "PHP", "language", true,false)

At this point, the study on "what are the search types of Lucene" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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