Difference between revisions of "Returning documents"

Revision as of 17:24, 26 July 2015

#ENCODING
import io
import sys
sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-16')
#MONGO
from pymongo import MongoClient
client = MongoClient()
client.progzoo.authenticate('scott','tiger')
db = client['progzoo']
#PRETTY
import pprint
pp = pprint.PrettyPrinter(indent=4)
#CODE
from bson.code import Code

Top Tips

Find

Return all documents

pp.pprint(list(
    db.world.find()
))

pp.pprint(list(
    db.world.aggregate([{"$match":{}}])
))

Returning the first document

pp.pprint(db.world.find_one())
pp.pprint(db.world.find()[0])
pp.pprint(list(db.world.find().limit(1))[0])
pp.pprint(list(db.world.aggregate([{"$limit":1}]))[0])

Returning the nth document

n = 50;
pp.pprint(db.world.find()[n-1])
pp.pprint(list(db.world.find().skip(n-1).limit(1))[0])
pp.pprint(list(db.world.aggregate([{"$skip":n-1},{"$limit":1}]))[0])

Returning the last document

pp.pprint(db.world.find()[db.world.count()-1])
pp.pprint(list(db.world.find().skip(db.world.count()-1).limit(1))[0])
pp.pprint(list(db.world.aggregate([{"$skip":db.world.count()-1},{"$limit":1}]))[0])