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