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import unittest
from django.core.management.color import no_style
from django.db import connection
from django.test import TransactionTestCase
from ..models import Person, Tag
@unittest.skipUnless(connection.vendor == 'oracle', 'Oracle tests')
class OperationsTests(TransactionTestCase):
available_apps = ['backends']
def test_sequence_name_truncation(self):
seq_name = connection.ops._get_no_autofield_sequence_name('schema_authorwithevenlongee869')
self.assertEqual(seq_name, 'SCHEMA_AUTHORWITHEVENLOB0B8_SQ')
def test_bulk_batch_size(self):
# Oracle restricts the number of parameters in a query.
objects = range(2**16)
self.assertEqual(connection.ops.bulk_batch_size([], objects), len(objects))
# Each field is a parameter for each object.
self.assertEqual(
connection.ops.bulk_batch_size(['id'], objects),
connection.features.max_query_params,
)
self.assertEqual(
connection.ops.bulk_batch_size(['id', 'other'], objects),
connection.features.max_query_params // 2,
)
def test_sql_flush(self):
statements = connection.ops.sql_flush(
no_style(),
[Person._meta.db_table, Tag._meta.db_table],
)
# The tables and constraints are processed in an unordered set.
self.assertEqual(
statements[0],
'ALTER TABLE "BACKENDS_TAG" DISABLE CONSTRAINT '
'"BACKENDS__CONTENT_T_FD9D7A85_F" KEEP INDEX;',
)
self.assertEqual(
sorted(statements[1:-1]),
[
'TRUNCATE TABLE "BACKENDS_PERSON";',
'TRUNCATE TABLE "BACKENDS_TAG";',
],
)
self.assertEqual(
statements[-1],
'ALTER TABLE "BACKENDS_TAG" ENABLE CONSTRAINT '
'"BACKENDS__CONTENT_T_FD9D7A85_F";',
)
def test_sql_flush_allow_cascade(self):
statements = connection.ops.sql_flush(
no_style(),
[Person._meta.db_table, Tag._meta.db_table],
allow_cascade=True,
)
# The tables and constraints are processed in an unordered set.
self.assertEqual(
statements[0],
'ALTER TABLE "BACKENDS_VERYLONGMODELNAME540F" DISABLE CONSTRAINT '
'"BACKENDS__PERSON_ID_1DD5E829_F" KEEP INDEX;',
)
self.assertEqual(
sorted(statements[1:-1]),
[
'TRUNCATE TABLE "BACKENDS_PERSON";',
'TRUNCATE TABLE "BACKENDS_TAG";',
'TRUNCATE TABLE "BACKENDS_VERYLONGMODELNAME540F";',
],
)
self.assertEqual(
statements[-1],
'ALTER TABLE "BACKENDS_VERYLONGMODELNAME540F" ENABLE CONSTRAINT '
'"BACKENDS__PERSON_ID_1DD5E829_F";',
)
def test_sql_flush_sequences(self):
statements = connection.ops.sql_flush(
no_style(),
[Person._meta.db_table, Tag._meta.db_table],
reset_sequences=True,
)
# The tables and constraints are processed in an unordered set.
self.assertEqual(
statements[0],
'ALTER TABLE "BACKENDS_TAG" DISABLE CONSTRAINT '
'"BACKENDS__CONTENT_T_FD9D7A85_F" KEEP INDEX;',
)
self.assertEqual(
sorted(statements[1:3]),
[
'TRUNCATE TABLE "BACKENDS_PERSON";',
'TRUNCATE TABLE "BACKENDS_TAG";',
],
)
self.assertEqual(
statements[3],
'ALTER TABLE "BACKENDS_TAG" ENABLE CONSTRAINT '
'"BACKENDS__CONTENT_T_FD9D7A85_F";',
)
# Sequences.
self.assertEqual(len(statements[4:]), 2)
self.assertIn('BACKENDS_PERSON_SQ', statements[4])
self.assertIn('BACKENDS_TAG_SQ', statements[5])
def test_sql_flush_sequences_allow_cascade(self):
statements = connection.ops.sql_flush(
no_style(),
[Person._meta.db_table, Tag._meta.db_table],
reset_sequences=True,
allow_cascade=True,
)
# The tables and constraints are processed in an unordered set.
self.assertEqual(
statements[0],
'ALTER TABLE "BACKENDS_VERYLONGMODELNAME540F" DISABLE CONSTRAINT '
'"BACKENDS__PERSON_ID_1DD5E829_F" KEEP INDEX;',
)
self.assertEqual(
sorted(statements[1:4]),
[
'TRUNCATE TABLE "BACKENDS_PERSON";',
'TRUNCATE TABLE "BACKENDS_TAG";',
'TRUNCATE TABLE "BACKENDS_VERYLONGMODELNAME540F";',
],
)
self.assertEqual(
statements[4],
'ALTER TABLE "BACKENDS_VERYLONGMODELNAME540F" ENABLE CONSTRAINT '
'"BACKENDS__PERSON_ID_1DD5E829_F";',
)
# Sequences.
self.assertEqual(len(statements[5:]), 3)
self.assertIn('BACKENDS_PERSON_SQ', statements[5])
self.assertIn('BACKENDS_VERYLONGMODELN7BE2_SQ', statements[6])
self.assertIn('BACKENDS_TAG_SQ', statements[7])
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