local mongo = require('mongo')
-- query all the values in the namespace 'test.values' where a > 10
local q1 = assert(db:query('test.values', {a = {['$gt'] = 10}}))
-- loop through the result set
for result in q1:results() do
    print(result.a)
    print(result.b)
end
-- query all the values in the namespace 'test.values' where a < 10 (JSON version)
local q2 = assert(db:query('test.values', "{'a': {'$lt': 10}}"))
local result = q2:next()
while result do
    print(result.a)
    print(result.b)
    result = q2:next()
end