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Django and PostgreSQL, a happy relationship
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Iacopo Spalletti
October 23, 2015
Programming
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Django and PostgreSQL, a happy relationship
Given at PgDay Italy 2015 23 October 2015
Iacopo Spalletti
October 23, 2015
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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!