在Lucene的多字段搜索

Question

我需要使用Lucene对Books数据库进行多字段级搜索。

例如：我的搜索条件类似于：

(Author:a1 and title:t1)  OR (Author:a2 and title:t2) OR (Author:a3 and title:t3) 

其中a1，t1等分别是作者姓名和书名。如何获取为此类条件构建的Lucene Query对象？

谢谢！

Answer 1

以下代码假设a1，a2，a3，t1，t2，t3是术语。如果它们是短语，则需要使用PhraseQuery而不是TermQuery。

    // Create a BooleanQuery for (Author:a1 and title:t1)

BooleanQuery a1AndT1 = new BooleanQuery();
a1AndT1.add(new TermQuery(new Term("Author", "a1")), BooleanClause.Occur.MUST);
a1AndT1.add(new TermQuery(new Term("title", "t1")), BooleanClause.Occur.MUST);

// Create a BooleanQuery for (Author:a2 and title:t2)

BooleanQuery a2AndT2 = new BooleanQuery();
a2AndT2.add(new TermQuery(new Term("Author", "a2")), BooleanClause.Occur.MUST);
a2AndT2.add(new TermQuery(new Term("title", "t2")), BooleanClause.Occur.MUST);

// Create a BooleanQuery for (Author:a3 and title:t3)

BooleanQuery a3AndT3 = new BooleanQuery();
a3AndT3.add(new TermQuery(new Term("Author", "a3")), BooleanClause.Occur.MUST);
a3AndT3.add(new TermQuery(new Term("title", "t3")), BooleanClause.Occur.MUST);

// Create a BooleanQuery that combines the OR-clauses

BooleanQuery query = new BooleanQuery();
query.add(a1AndT1, BooleanClause.Occur.SHOULD);
query.add(a2AndT2, BooleanClause.Occur.SHOULD);
query.add(a3AndT3, BooleanClause.Occur.SHOULD);

// As you can see, the resulting Lucene query is 
// (+Author:a1 +title:t1) (+Author:a2 +title:t2) (+Author:a3 +title:t3)
// which behaves the same as something like
// (Author:a1 and title:t1) OR (Author:a2 and title:t2) OR (Author:a3 and title:t3)

System.out.println(query);