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在pymongo我正在做一个排序的查询是这样的:pymongo到RMongo,MongoDB的排序查询
from pymongo import MongoClient
client = MongoClient()
dbase = client[dbname]
collection = dbase[symbol]
start = time.time()
cursor = collection.find().sort([{'_id', -1}]).limit(6000)
data = list(cursor)
试图做同样的事情中的R现在...
library("RMongo")
mongo <- mongoDbConnect("dbname", "localhost", 27017)
query = '{sort({_id: -1})}'
output <- dbGetQuery(mongo, "symbol", query, skip=0, limit=6000)
> output
data frame with 0 columns and 0 rows
是什么正确的JSON查询字符串格式在这里?