mirror of
https://github.com/django/django.git
synced 2024-12-23 09:36:06 +00:00
107 lines
5.2 KiB
Python
107 lines
5.2 KiB
Python
import unittest
|
|
|
|
from django.db import NotSupportedError, connection, transaction
|
|
from django.db.models import Count
|
|
from django.test import (
|
|
TestCase, ignore_warnings, skipIfDBFeature, skipUnlessDBFeature,
|
|
)
|
|
from django.test.utils import CaptureQueriesContext
|
|
from django.utils.deprecation import RemovedInDjango31Warning
|
|
|
|
from .models import Tag
|
|
|
|
|
|
@skipUnlessDBFeature('supports_explaining_query_execution')
|
|
class ExplainTests(TestCase):
|
|
|
|
@ignore_warnings(category=RemovedInDjango31Warning)
|
|
def test_basic(self):
|
|
querysets = [
|
|
Tag.objects.filter(name='test'),
|
|
Tag.objects.filter(name='test').select_related('parent'),
|
|
Tag.objects.filter(name='test').prefetch_related('children'),
|
|
Tag.objects.filter(name='test').annotate(Count('children')),
|
|
Tag.objects.filter(name='test').values_list('name'),
|
|
Tag.objects.order_by().union(Tag.objects.order_by().filter(name='test')),
|
|
Tag.objects.all().select_for_update().filter(name='test'),
|
|
]
|
|
supported_formats = connection.features.supported_explain_formats
|
|
all_formats = (None,) + tuple(supported_formats) + tuple(f.lower() for f in supported_formats)
|
|
for idx, queryset in enumerate(querysets):
|
|
for format in all_formats:
|
|
with self.subTest(format=format, queryset=idx):
|
|
if connection.vendor == 'mysql':
|
|
# This does a query and caches the result.
|
|
connection.features.needs_explain_extended
|
|
with self.assertNumQueries(1), CaptureQueriesContext(connection) as captured_queries:
|
|
result = queryset.explain(format=format)
|
|
self.assertTrue(captured_queries[0]['sql'].startswith(connection.ops.explain_prefix))
|
|
self.assertIsInstance(result, str)
|
|
self.assertTrue(result)
|
|
|
|
@skipUnlessDBFeature('validates_explain_options')
|
|
def test_unknown_options(self):
|
|
with self.assertRaisesMessage(ValueError, 'Unknown options: test, test2'):
|
|
Tag.objects.all().explain(test=1, test2=1)
|
|
|
|
def test_unknown_format(self):
|
|
msg = 'DOES NOT EXIST is not a recognized format.'
|
|
if connection.features.supported_explain_formats:
|
|
msg += ' Allowed formats: %s' % ', '.join(sorted(connection.features.supported_explain_formats))
|
|
with self.assertRaisesMessage(ValueError, msg):
|
|
Tag.objects.all().explain(format='does not exist')
|
|
|
|
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL specific')
|
|
def test_postgres_options(self):
|
|
qs = Tag.objects.filter(name='test')
|
|
test_options = [
|
|
{'COSTS': False, 'BUFFERS': True, 'ANALYZE': True},
|
|
{'costs': False, 'buffers': True, 'analyze': True},
|
|
{'verbose': True, 'timing': True, 'analyze': True},
|
|
{'verbose': False, 'timing': False, 'analyze': True},
|
|
]
|
|
if connection.pg_version >= 100000:
|
|
test_options.append({'summary': True})
|
|
for options in test_options:
|
|
with self.subTest(**options), transaction.atomic():
|
|
with CaptureQueriesContext(connection) as captured_queries:
|
|
qs.explain(format='text', **options)
|
|
self.assertEqual(len(captured_queries), 1)
|
|
for name, value in options.items():
|
|
option = '{} {}'.format(name.upper(), 'true' if value else 'false')
|
|
self.assertIn(option, captured_queries[0]['sql'])
|
|
|
|
@unittest.skipUnless(connection.vendor == 'mysql', 'MySQL specific')
|
|
def test_mysql_text_to_traditional(self):
|
|
# Initialize the cached property, if needed, to prevent a query for
|
|
# the MySQL version during the QuerySet evaluation.
|
|
connection.features.needs_explain_extended
|
|
with CaptureQueriesContext(connection) as captured_queries:
|
|
Tag.objects.filter(name='test').explain(format='text')
|
|
self.assertEqual(len(captured_queries), 1)
|
|
self.assertIn('FORMAT=TRADITIONAL', captured_queries[0]['sql'])
|
|
|
|
@unittest.skipUnless(connection.vendor == 'mysql', 'MySQL < 5.7 specific')
|
|
def test_mysql_extended(self):
|
|
# Inner skip to avoid module level query for MySQL version.
|
|
if not connection.features.needs_explain_extended:
|
|
raise unittest.SkipTest('MySQL < 5.7 specific')
|
|
qs = Tag.objects.filter(name='test')
|
|
with CaptureQueriesContext(connection) as captured_queries:
|
|
qs.explain(format='json')
|
|
self.assertEqual(len(captured_queries), 1)
|
|
self.assertNotIn('EXTENDED', captured_queries[0]['sql'])
|
|
with CaptureQueriesContext(connection) as captured_queries:
|
|
qs.explain(format='text')
|
|
self.assertEqual(len(captured_queries), 1)
|
|
self.assertNotIn('EXTENDED', captured_queries[0]['sql'])
|
|
|
|
|
|
@skipIfDBFeature('supports_explaining_query_execution')
|
|
class ExplainUnsupportedTests(TestCase):
|
|
|
|
def test_message(self):
|
|
msg = 'This backend does not support explaining query execution.'
|
|
with self.assertRaisesMessage(NotSupportedError, msg):
|
|
Tag.objects.filter(name='test').explain()
|