django/tests/introspection/tests.py

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from __future__ import unicode_literals
from django.db import connection
from django.db.utils import DatabaseError
from django.test import TestCase, skipUnlessDBFeature
from .models import Reporter, Article
class IntrospectionTests(TestCase):
def test_table_names(self):
tl = connection.introspection.table_names()
self.assertEqual(tl, sorted(tl))
self.assertTrue(Reporter._meta.db_table in tl,
"'%s' isn't in table_list()." % Reporter._meta.db_table)
self.assertTrue(Article._meta.db_table in tl,
"'%s' isn't in table_list()." % Article._meta.db_table)
def test_django_table_names(self):
with connection.cursor() as cursor:
cursor.execute('CREATE TABLE django_ixn_test_table (id INTEGER);')
tl = connection.introspection.django_table_names()
cursor.execute("DROP TABLE django_ixn_test_table;")
self.assertNotIn('django_ixn_test_table', tl,
"django_table_names() returned a non-Django table")
def test_django_table_names_retval_type(self):
# Ticket #15216
with connection.cursor() as cursor:
cursor.execute('CREATE TABLE django_ixn_test_table (id INTEGER);')
tl = connection.introspection.django_table_names(only_existing=True)
self.assertIs(type(tl), list)
tl = connection.introspection.django_table_names(only_existing=False)
self.assertIs(type(tl), list)
def test_table_names_with_views(self):
with connection.cursor() as cursor:
try:
cursor.execute(
'CREATE VIEW introspection_article_view AS SELECT headline '
'from introspection_article;')
except DatabaseError as e:
if 'insufficient privileges' in str(e):
self.skipTest("The test user has no CREATE VIEW privileges")
else:
raise
self.assertIn('introspection_article_view',
connection.introspection.table_names(include_views=True))
self.assertNotIn('introspection_article_view',
connection.introspection.table_names())
def test_installed_models(self):
tables = [Article._meta.db_table, Reporter._meta.db_table]
models = connection.introspection.installed_models(tables)
self.assertEqual(models, set([Article, Reporter]))
def test_sequence_list(self):
sequences = connection.introspection.sequence_list()
expected = {'table': Reporter._meta.db_table, 'column': 'id'}
self.assertTrue(expected in sequences,
'Reporter sequence not found in sequence_list()')
def test_get_table_description_names(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table)
self.assertEqual([r[0] for r in desc],
[f.column for f in Reporter._meta.fields])
def test_get_table_description_types(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table)
self.assertEqual(
[datatype(r[1], r) for r in desc],
['AutoField' if connection.features.can_introspect_autofield else 'IntegerField',
'CharField', 'CharField', 'CharField',
'BigIntegerField' if connection.features.can_introspect_big_integer_field else 'IntegerField',
'BinaryField' if connection.features.can_introspect_binary_field else 'TextField',
'SmallIntegerField' if connection.features.can_introspect_small_integer_field else 'IntegerField']
)
# The following test fails on Oracle due to #17202 (can't correctly
# inspect the length of character columns).
@skipUnlessDBFeature('can_introspect_max_length')
def test_get_table_description_col_lengths(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table)
self.assertEqual(
[r[3] for r in desc if datatype(r[1], r) == 'CharField'],
[30, 30, 254]
)
@skipUnlessDBFeature('can_introspect_null')
def test_get_table_description_nullable(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table)
nullable_by_backend = connection.features.interprets_empty_strings_as_nulls
self.assertEqual(
[r[6] for r in desc],
[False, nullable_by_backend, nullable_by_backend, nullable_by_backend, True, True, False]
)
# Regression test for #9991 - 'real' types in postgres
@skipUnlessDBFeature('has_real_datatype')
def test_postgresql_real_type(self):
with connection.cursor() as cursor:
cursor.execute("CREATE TABLE django_ixn_real_test_table (number REAL);")
desc = connection.introspection.get_table_description(cursor, 'django_ixn_real_test_table')
cursor.execute('DROP TABLE django_ixn_real_test_table;')
self.assertEqual(datatype(desc[0][1], desc[0]), 'FloatField')
def test_get_relations(self):
with connection.cursor() as cursor:
relations = connection.introspection.get_relations(cursor, Article._meta.db_table)
# Older versions of MySQL don't have the chops to report on this stuff,
# so just skip it if no relations come back. If they do, though, we
# should test that the response is correct.
if relations:
# That's {field_index: (field_index_other_table, other_table)}
self.assertEqual(relations, {3: (0, Reporter._meta.db_table),
4: (0, Article._meta.db_table)})
@skipUnlessDBFeature('can_introspect_foreign_keys')
def test_get_key_columns(self):
with connection.cursor() as cursor:
key_columns = connection.introspection.get_key_columns(cursor, Article._meta.db_table)
self.assertEqual(
set(key_columns),
set([('reporter_id', Reporter._meta.db_table, 'id'),
('response_to_id', Article._meta.db_table, 'id')]))
def test_get_primary_key_column(self):
with connection.cursor() as cursor:
primary_key_column = connection.introspection.get_primary_key_column(cursor, Article._meta.db_table)
self.assertEqual(primary_key_column, 'id')
def test_get_indexes(self):
with connection.cursor() as cursor:
indexes = connection.introspection.get_indexes(cursor, Article._meta.db_table)
self.assertEqual(indexes['reporter_id'], {'unique': False, 'primary_key': False})
def test_get_indexes_multicol(self):
"""
Test that multicolumn indexes are not included in the introspection
results.
"""
with connection.cursor() as cursor:
indexes = connection.introspection.get_indexes(cursor, Reporter._meta.db_table)
self.assertNotIn('first_name', indexes)
self.assertIn('id', indexes)
def datatype(dbtype, description):
"""Helper to convert a data type into a string."""
dt = connection.introspection.get_field_type(dbtype, description)
if type(dt) is tuple:
return dt[0]
else:
return dt