Lucene single-domain multi-condition query

In Lucene, Booleanclause is used to represent a Boolean query clause relationship class, including: BooleanClause.Occur.MUST means and,booleanclause.occur.must_not represents not, BooleanClause.Occur.SHOULD represents or.

Here's an example.

2. **
4. * Query according to information classification and keywords
6. * @param type, resource, with a value of news or product
8. * @param searchkey, search for keywords
10. * @return Hits
12. */
14. Public Hits executesearch (String keyword)
16. {
18. Hits result = null;
20. if(keyword! = null &&!keyword.equals (""))
22. {
24. Try
26. {
28. //construct an array by keyword
30. string[] key = new String[]{keyword,type};
32. //Declare a corresponding array of fields at the same time
34. string[] fields = {"title"};
36. //Declaration booleanclause.occur[] Array, which represents the relationship between multiple conditions
38. Booleanclause.occur[] flags=new Booleanclause.occur[]{booleanclause.occur.must, BooleanClause.Occur.MUST};
40. Chineseanalyzer Analyzer = new chineseanalyzer ();
42. //Use Multifieldqueryparser to get the query object
44. Query query = Multifieldqueryparser.parse (key, fields, flags, analyzer);
46. //c:/index indicates the directory where our index files are located
48. Indexsearcher searcher = new indexsearcher ("C:/index");
50. //Query Results
52. result = Searcher.search (query);
54. } catch (Exception e)
56. {
58. E.printstacktrace ();
60. }
62. }
64. return result;
66. }

Multi-Conditional index relationships

Booleanclause classes used to represent Boolean query clause relationships, including: BooleanClause.Occur.MUST,

Booleanclause.occur.must_not,booleanclause.occur.should. There are 6 combinations of the following:
1. Must and must: Gets the intersection of a query clause.
2. Must and Must_not: indicates that the query results cannot contain the results of the query clause that the must_not corresponds to.
3. Must_not and Must_not: no meaning, no results are retrieved.
4. Should with must, should and must_not:should and must, the result is the retrieval of the MUST clause

Results. With Must_not, the function is the same as must.
5. Should and should: represents the "or" relationship, and the final result is the set of all search clauses.

Lucene single-domain multi-condition query