o'higgins n. - mongdb & python - 2011.pdf

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MongoDB and Python
Niall O’Higgins
Beijing
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MongoDB and Python
by Niall O’Higgins
Copyright © 2011 Niall O’Higgins. All rights reserved.
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While every precaution has been taken in the preparation of this book, the publisher and author assume
no responsibility for errors or omissions, or for damages resulting from the use of the information con-
tained herein.
ISBN: 978-1-449-31037-0
[LSI]
1315837615
Table of Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
1. Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction
Finding Reference Documentation
Installing MongoDB
Running MongoDB
Setting up a Python Environment with MongoDB
1
2
3
5
6
2. Reading and Writing to MongoDB with Python . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Connecting to MongoDB with Python
Getting a Database Handle
Inserting a Document into a Collection
Write to a Collection Safely and Synchronously
Guaranteeing Writes to Multiple Database Nodes
Introduction to MongoDB Query Language
Reading, Counting, and Sorting Documents in a Collection
Updating Documents in a Collection
Deleting Documents from a Collection
MongoDB Query Operators
MongoDB Update Modifiers
10
11
12
13
14
15
15
18
20
21
22
3. Common MongoDB and Python Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
A Uniquely Document-Oriented Pattern: Embedding
Fast Lookups: Using Indexes with MongoDB
Location-based Apps with MongoDB: GeoSpatial Indexing
Code Defensively to Avoid KeyErrors and Other Bugs
Update-or-Insert: Upserts in MongoDB
Atomic Read-Write-Modify: MongoDB’s findAndModify
Fast Accounting Pattern
23
29
33
37
39
40
41
iii

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