问题
This question is a spin-off from this question. My inquiry is two-fold, but because both are related I think it is a good idea to put them together.
- How to programmatically create queries. I know I could start creating strings and get that string parsed with the query parser. But as I gather bits and pieces of information from other resources, there is a programattical way to do this.
- What are the syntax rules for the Lucene queries?
--EDIT--
I'll give a requirement example for a query I would like to make:
Say I have 5 fields:
- First Name
- Last Name
- Age
- Address
- Everything
All fields are optional, the last field should search over all the other fields.
I go over every field and see if it's IsNullOrEmpty(). If it's not, I would like to append a part of my query so it adds the relevant search part.
First name and last name should be exact matches and have more weight then the other fields. Age is a string and should exact match. Address can varry in order. Everything can also varry in order.
How should I go about this?
回答1:
Use the BooleanQuery class to compose query objects. Create one of these and add() other Query objects to it to create a larger, disjunctive query:
- BooleanQuery q = new BooleanQuery();
- q.add(qFirstName, Occur.SHOULD);
- q.add(qLastName, Occur.SHOULD);
- ...
Atomic queries can be built with the Term and TermQuery classes.
(Links and example are for Lucene Java, but .NET should be similar.)
来源：https://stackoverflow.com/questions/532512/how-to-create-more-complex-lucene-query-strings