Lucene.net / c＃/添加过滤查询

Question

我怀疑如何使用BooleanQuery和TermQuery等在lucene.net中进行查询。我希望它的行为与此sql语句相同：

"... WHERE ((isprivate = false) OR (isprivate = true and userid = 1))"

任何人都可以帮助我。

直到现在我只有

BooleanQuery booleanQuery = new BooleanQuery();
TermQuery isPrivateQuery = new TermQuery(new Term("isprivate", "true"));

Answer 1

您的查询可以重写为：

"... WHERE (isprivate = false) OR (userid = 1)"

所以你可以拥有下一个代码（考虑到你的值存储为字符串）：

BooleanQuery booleanQuery = new BooleanQuery();
booleanQuery.Add(new TermQuery(new Term("isprivate", "true")), BooleanClause.Occur.SHOULD);
booleanQuery.Add(new TermQuery(new Term("userid", "1")), BooleanClause.Occur.SHOULD);

如果要进行更复杂的查询，则可以将一个BooleanQuery作为子句添加到另一个BooleanQuery中：

// Creating "and" clause
BooleanQuery booleanQueryInner = new BooleanQuery();
booleanQueryInner.Add(new TermQuery(new Term("isprivate", "false")), BooleanClause.Occur.MUST);
booleanQueryInner.Add(new TermQuery(new Term("userid", "1")), BooleanClause.Occur.MUST);

// Creating "or" clause
BooleanQuery booleanQueryMain = new BooleanQuery();
booleanQueryMain.Add(new TermQuery(new Term("isprivate", "true")), BooleanClause.Occur.SHOULD);
booleanQueryMain.Add(booleanQueryInner, BooleanClause.Occur.SHOULD);