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from unittest import mock
from django.db import DEFAULT_DB_ALIAS, DatabaseError, connection
from django.db.models.sql import Query
from django.db.models.sql.compiler import SQLCompiler
from django.test import TestCase
from .models import Item
class SQLCompilerTest(TestCase):
def test_repr(self):
query = Query(Item)
compiler = query.get_compiler(DEFAULT_DB_ALIAS, connection)
self.assertEqual(
repr(compiler),
f"<SQLCompiler model=Item connection="
f"<DatabaseWrapper vendor={connection.vendor!r} alias='default'> "
f"using='default'>",
)
def test_execute_sql_suppresses_cursor_closing_failure_on_exception(self):
query = Query(Item)
compiler = SQLCompiler(query, connection, None)
cursor = mock.MagicMock()
# When execution fails, the cursor may have been closed.
# Django's attempt to close it again will fail, and needs catching.
execute_err = DatabaseError("execute failed")
cursor.execute.side_effect = execute_err
cursor.close.side_effect = DatabaseError("close failed")
with mock.patch.object(connection, "cursor", return_value=cursor):
with self.assertRaises(DatabaseError) as ctx:
compiler.execute_sql("SELECT 1", [])
# There is no irrelevant context from trying to close a closed cursor.
exc = ctx.exception
self.assertIs(exc, execute_err)
self.assertIsNone(exc.__cause__)
self.assertTrue(exc.__suppress_context__)
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