Lucene.net / C＃/添加过滤器查询

Question

I am in doubt of how to make a query in lucene.net using BooleanQuery and TermQuery etc. I want it to act in the same way as this sql statement:

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

Can anyone help me with this.

Untill now I only have

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

Answer 1

Your query can be rewritten as:

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

So you can have the next code (considering that your values are stored as string):

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);

If you want to make more complex queries, then you can add one BooleanQuery as a clause to another BooleanQuery:

// 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);