mirror of https://github.com/django/django.git
55 lines
2.1 KiB
Python
55 lines
2.1 KiB
Python
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import unittest
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from collections import namedtuple
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from django.db import connection
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from django.test import TestCase
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from .models import Person
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@unittest.skipUnless(connection.vendor == 'postgresql', "Test only for PostgreSQL")
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class ServerSideCursorsPostgres(TestCase):
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cursor_fields = 'name, statement, is_holdable, is_binary, is_scrollable, creation_time'
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PostgresCursor = namedtuple('PostgresCursor', cursor_fields)
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@classmethod
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def setUpTestData(cls):
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Person.objects.create(first_name='a', last_name='a')
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Person.objects.create(first_name='b', last_name='b')
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def inspect_cursors(self):
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with connection.cursor() as cursor:
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cursor.execute('SELECT {fields} FROM pg_cursors;'.format(fields=self.cursor_fields))
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cursors = cursor.fetchall()
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return [self.PostgresCursor._make(cursor) for cursor in cursors]
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def test_server_side_cursor(self):
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persons = Person.objects.iterator()
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next(persons) # Open a server-side cursor
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cursors = self.inspect_cursors()
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self.assertEqual(len(cursors), 1)
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self.assertIn('_django_curs_', cursors[0].name)
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self.assertFalse(cursors[0].is_scrollable)
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self.assertFalse(cursors[0].is_holdable)
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self.assertFalse(cursors[0].is_binary)
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def test_server_side_cursor_many_cursors(self):
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persons = Person.objects.iterator()
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persons2 = Person.objects.iterator()
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next(persons) # Open a server-side cursor
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next(persons2) # Open a second server-side cursor
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cursors = self.inspect_cursors()
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self.assertEqual(len(cursors), 2)
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for cursor in cursors:
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self.assertIn('_django_curs_', cursor.name)
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self.assertFalse(cursor.is_scrollable)
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self.assertFalse(cursor.is_holdable)
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self.assertFalse(cursor.is_binary)
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def test_closed_server_side_cursor(self):
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persons = Person.objects.iterator()
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next(persons) # Open a server-side cursor
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del persons
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cursors = self.inspect_cursors()
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self.assertEqual(len(cursors), 0)
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