Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Django and PostgreSQL, a happy relationship
Search
Iacopo Spalletti
October 23, 2015
Programming
0
37
Django and PostgreSQL, a happy relationship
Given at PgDay Italy 2015 23 October 2015
Iacopo Spalletti
October 23, 2015
Tweet
Share
More Decks by Iacopo Spalletti
See All by Iacopo Spalletti
Django dalle trincee: pattern e pratiche dopo 15 anni di esperienza su Django
yakky
0
68
Writing Async Microservices in Python
yakky
0
750
1 API - 3 Framework - 30 minutes
yakky
0
96
Building real time applications with Django and Channels 2 @ DjangoCon Europe
yakky
1
740
Building real time applications with Django and Channels 2 @ PyCon Italia
yakky
0
590
Building real time applications with Django
yakky
0
730
django knocker
yakky
0
59
django CMS application - A comprehensive approach
yakky
0
53
django CMS + Channels + DRF = ♥
yakky
0
320
Other Decks in Programming
See All in Programming
Web フロントエンドエンジニアに開かれる AI Agent プロダクト開発 - Vercel AI SDK を観察して AI Agent と仲良くなろう! #FEC余熱NIGHT
izumin5210
3
420
「ちょっと古いから」って避けてた技術書、今だからこそ読もう
mottyzzz
1
280
CSC509 Lecture 05
javiergs
PRO
0
300
monorepo の Go テストをはやくした〜い!~最小の依存解決への道のり~ / faster-testing-of-monorepos
convto
2
410
いま中途半端なSwift 6対応をするより、Default ActorやApproachable Concurrencyを有効にしてからでいいんじゃない?
yimajo
2
340
Serena MCPのすすめ
wadakatu
4
900
私はどうやって技術力を上げたのか
yusukebe
43
17k
『毎日の移動』を支えるGoバックエンド内製開発
yutautsugi
2
200
CSC509 Lecture 03
javiergs
PRO
0
330
XP, Testing and ninja testing ZOZ5
m_seki
3
320
CSC509 Lecture 02
javiergs
PRO
0
410
iOSエンジニア向けの英語学習アプリを作る!
yukawashouhei
0
180
Featured
See All Featured
Typedesign – Prime Four
hannesfritz
42
2.8k
Making Projects Easy
brettharned
119
6.4k
Raft: Consensus for Rubyists
vanstee
139
7.1k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.7k
Become a Pro
speakerdeck
PRO
29
5.5k
Producing Creativity
orderedlist
PRO
347
40k
Intergalactic Javascript Robots from Outer Space
tanoku
273
27k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
7
890
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
31
9.7k
Code Review Best Practice
trishagee
72
19k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
252
21k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
9
580
Transcript
PGDAY 2015 DJANGO AND POSTGRESQL, A HAPPY RELATIONSHIP by Iacopo
Spalletti @yakkys
WHO AM I? Founder and Lead developer @NephilaIt django CMS
core developer django CMS installer author
WHAT'S DJANGO? A web framework written in Python Based on
an DBMS-agnostic ORM
DJANGO ORM But sometimes abstraction is not enough
POSTGRESQL EXTENSIONS PostGIS Support django-hstore django.contrib.postgres
DJANGO-HSTORE External application to support hstore datatype Supports Django 1.6-1.8+
Integrated editor
DJANGO-HSTORE Easy to use class PrinterData(models.Model): printer = models.ForeignKey(Printer) data
= hstore.DictionaryField() ... objects = hstore.HStoreManager() That's all (plus run create extension hstore)
DJANGO-HSTORE Demo time
CONTRIB.POSTGRES Official module Available since 1.8 Supports many datatypes UUID
HStore Array Rangefields
CONTRIB.POSTGRES UUID class Example(models.Model): id = models.UUIDField(default=uuid.uuid4, primary_key=True)
CONTRIB.POSTGRES ARRAYFIELD class Post(models.Model): name = models.CharField(max_length=200) tags = ArrayField(models.CharField(max_length=200))
Supports query functions: contains (@>), contained_by (<@), overlap (&&), len, indexing, slicing
CONTRIB.POSTGRES ARRAYFIELD # SQL operator: @> Post.objects.filter(tags__contains=['thoughts']) # SQL operator:
<@ Post.objects.filter(tags__contained_by=['thoughts', 'django']) # SQL operator: && Post.objects.filter(tags__overlap=['thoughts']) # len Post.objects.filter(tags__len=1) # indexing Post.objects.filter(tags__1__iexact='django') # slicing Post.objects.filter(tags__1_2='thoughts')
CONTRIB.POSTGRES HSTORE class Post(models.Model): name = models.CharField(max_length=200) data = HStoreField()
Support query functions: filter, chaining, contains, contained_by, has_key, has_any_key, has_keys
CONTRIB.POSTGRES HSTORE # filter Post.objects.filter(data__category='main') # chaining Post.objects.filter(data__category__contains='h') # SQL
operator: @> Post.objects.filter(data__contains={'category': 'home'}) # SQL operator: <@ Post.objects.filter(data__contained_by={'category': 'home', 'author' # SQL operator: ? Post.objects.filter(data__has_key='category') # SQL operator: ?| Post.objects.filter(data__has_any_keys='category') # SQL operator: ?& Post.objects.filter(data__has_keys=['category', 'author'])
CONTRIB.POSTGRES RANGE FIELDS python_2_unicode_compatible class Post(models.Model): name = models.CharField(max_length=200) ...
skill_range = IntegerRangeField() Supports a lot of query functions: contains, contained_by, overlap, fully_lt, fully_gt, not_lt, not_gt, adjacent_to, startswith, endswith, isempty Definition of custom range types
CONTRIB.POSTGRES RANGE FIELDS # SQL operator: @> Post.objects.filter(skill_range__contains=NumericRange(3, 5)) #
SQL operator: <@ Post.objects.filter(skill_range__contained_by=NumericRange(2, 3)) # SQL operator: && Post.objects.filter(skill_range__overlap=NumericRange(2, 3)) # fully_lt Post.objects.filter(skill_range__fully_lt=NumericRange(3, 6)) # fully_gt Post.objects.filter(skill_range__fully_gt=NumericRange(2, 3))
DJANGO AND POSTGRESQL Support is evolving More goodies in 1.9
GRAZIE!