Returning documents: Difference between revisions
From NoSQLZoo
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<div style='height:25em;'> | <div style='height:25em;'> | ||
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<div class=q data-lang="py3"> | <div class=q data-lang="py3">Returning the first documents | ||
<pre class=def> | <pre class=def> | ||
pp.pprint(db.world.find_one()) | pp.pprint(db.world.find_one()) | ||
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pp.pprint(list(db.world.find().skip(n-1).limit(1))[0]) | pp.pprint(list(db.world.find().skip(n-1).limit(1))[0]) | ||
pp.pprint(list(db.world.aggregate([{"$skip":n-1},{"$limit":1}]))[0]) | pp.pprint(list(db.world.aggregate([{"$skip":n-1},{"$limit":1}]))[0]) | ||
</pre> | |||
</div> | |||
<div class=q data-lang="py3">Returning the last document | |||
<pre class=def> | |||
n = 50; | |||
pp.pprint(db.world.find()[db.world.count()-1]) | |||
pp.pprint(list(db.world.find().skip(db.world.count()-2).limit(1))[0]) | |||
pp.pprint(list(db.world.aggregate([{"$skip":db.world.count()-2},{"$limit":1}]))[0]) | |||
</pre> | </pre> | ||
</div> | </div> | ||
Revision as of 16:20, 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
Returning the first documents
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},{"$limit":1}]))[0])
Returning the last document
n = 50;
pp.pprint(db.world.find()[db.world.count()-1])
pp.pprint(list(db.world.find().skip(db.world.count()-2).limit(1))[0])
pp.pprint(list(db.world.aggregate([{"$skip":db.world.count()-2},{"$limit":1}]))[0])