Difference between revisions of "Returning documents"

Revision as of 16:21, 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

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])

@@ Line 18: / Line 18: @@
 <div style='height:25em;'>
 </div>
-<div class=q data-lang="py3">Returning the first documents
+<div class=q data-lang="py3">Returning the first document
 <pre class=def>
 pp.pprint(db.world.find_one())