mongodb快速查询总数

mongodb快速查询总数

无需使用db.find去统计count，如果数据很多就会很慢。最简单的获取总数方法就是查询collection状态

db.collection.stats()

ConnectionString connString = new ConnectionString(

    "mongodb://192.168.30.216:27017/tunnel_db?w=majority"

);

MongoClientSettings settings = MongoClientSettings.builder()

    .applyConnectionString(connString)

    .retryWrites(true)

    .build();

MongoClient mongoClient = MongoClients.create(settings);

MongoDatabase database = mongoClient.getDatabase("tunnel_db");

FindIterable res = database.getCollection("history").find().skip(10).limit(10);

for (Document d : res) {

    System.out.println(d.toJson());

}

Document stats = database.runCommand(new Document("collStats", "history"));

System.out.println(stats);