在Java MongoDB驱动程序中使用find后如何获得计数？

Question

I was answered about constructing a MongoDb query

How to code collection find with regex and complex criteria using Java MongoDB driver?

Still the question about a count was unanswered: So for this query how to write an analogous Java code returning count:

db.cache.find({objectKey: { $regex: 'Bos*'}, cacheVersionString:'08/03/15_11:05:09'}).count()

Answer 1

With MongoTemplate , it would be something like this:

Query query = new Query();
query.addCriteria(Criteria.where("objectKey").regex("Bos*"));
query.addCriteria(Criteria.where("cacheVersionString").is("08/03/15_11:05:09"));
long count = mongoTemplate.count(query, MyClass.class);