MongoDB row index limit query like SQL - mongodb

Question

I would like to retrieve a list that contains an specified record under some conditions and only retrieve a number of records before and a number of records after that record. Are there any solutions?
For example, I have a MongoDB schema { id, date, section }
Data set:
100, 26 Aug 2014 11:00, A
110, 26 Aug 2014 11:01, A
140, 26 Aug 2014 12:00, A
141, 27 Aug 2014 12:00, B
200, 30 Aug 2014 11:00, A
210, 01 Sep 2014 11:01, B
290, 02 Sep 2014 12:00, A
300, 26 Sep 2014 12:00, A
301, 27 Oct 2014 12:00, B
302, 30 Oct 2014 11:23, A
410, 01 Oct 2014 15:01, B
590, 02 Oct 2014 12:00, A
600, 26 Nov 2014 00:00, A
I would like to get a list, which contains an unique id = 300 and 3 records before and 3 records after that record with id = 300, sorted by date under section A.
The output:
140, 26 Aug 2014 12:00, A
200, 30 Aug 2014 11:00, A
290, 02 Sep 2014 12:00, A
300, 26 Sep 2014 12:00, A <-- middle
302, 30 Oct 2014 11:23, A
590, 02 Oct 2014 12:00, A
600, 26 Nov 2014 00:00, A
I have a stupid approach:
get the date (let say it's 26 Sept 2014 12:00) of the specified id = 300 with section A
set a query to find records that the date is greater than and equal to 26 Sept 2014 12:00 ordered by date, limited by 3 records.
set a query to find records that the date is less than 26 Sept 2014 12:00 ordered by date, limited by 3 records.
combine two lists.
Is there any better approaches to just retrieve this kind of list in a query or in better performance? Thank you.

Answer 1

Let's your schema name be USER. You could use below mongo db query to fetch the result
$sort function :
1 represents ascending
-1 represents descending
Refer documentation : $Sort Documentation
Query will be :
db.user.aggregate({$match : { "id" : 300}},{$sort : {"date": 1 }},{$skip : 0},{$limit : 10});
$skip value will be your limit value after first query
db.user.aggregate({$match : { "id" : 300}},{$sort : {"date": 1 }},{$skip : 10},{$limit : 10});
Refer Documentation : Aggregation Documentation

Answer 2

$skip and $limit in aggregation framework
Here is a good example of using skip and limit which should help you achieve the SELECT TOP X or LIMIT X
Note: I'm assuming you want to use the aggregate framework based on the tagging of this question.
I believe this should do it
x = 300;
db.user.aggregate({$match : { "id" : {$lte: x+10,$gte: x-10 }},{$sort : {"date": 1 }}});