Lucene中的多字段搜索

Question

我需要使用Lucene對Books數據庫進行多字段級搜索。

例如：我的搜索標準是一樣的東西：

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

其中a1，t1等分別爲作者名和書名。我如何獲得爲這種標準構建的Lucene Query對象？

謝謝！

Answer 1

以下代碼假設a1，a2，a3，t1，t2，t3是術語。如果它們是短語，則需要使用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);