Unable to create table in the database using Django oracle12c - django

Question

I am working on a college project for which I am supposed to use oracle database as the backend and I have chosen to work with django as the programming language.
I have successfully connected django with oracle 12c and also have cx_Oracle installed. But when i try to run the command
py manage.py migrate
the following errors show up.
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reserved.
PS C:\Users\Hp\Desktop\onlinepharma> py manage.py migrate
Operations to perform:
Apply all migrations: admin, auth, contenttypes, sessions, testing Running migrations: Applying contenttypes.0001_initial...Traceback
(most recent call last): File
"C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-
packages\django\db\backends\utils.py", line 83, in _execute
return self.cursor.execute(sql) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\oracle\base.py",
line 513, in execute
return self.cursor.execute(query, self._param_generator(params)) cx_Oracle.DatabaseError: ORA-00955: name is already used by an
existing object
The above exception was the direct cause of the following exception:
Traceback (most recent call last): File "manage.py", line 15, in
execute_from_command_line(sys.argv) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management__init__.py",
line 381, in execute_from_command_line
utility.execute() File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management__init__.py",
line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\base.py",
line 316, in run_from_argv
self.execute(*args, **cmd_options) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\base.py",
line 353, in execute
output = self.handle(*args, **options) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\base.py",
line 83, in wrapped
res = handle_func(*args, **kwargs) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\commands\migrate.py",
line 203, in handle
fake_initial=fake_initial, File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\executor.py",
line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial) File
"C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\executor.py",
line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial) File
"C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\executor.py",
line 244, in apply_migration
state = migration.apply(state, schema_editor) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\migration.py",
line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state) File
"C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\operations\models.py",
line 91, in database_forwards
schema_editor.create_model(model) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\base\schema.py",
line 312, in create_model
self.execute(sql, params or None) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\base\schema.py",
line 133, in execute
cursor.execute(sql, params) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py",
line 100, in execute
return super().execute(sql, params) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py",
line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute) File
"C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py",
line 77, in _execute_with_wrappers
return executor(sql, params, many, context) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py",
line 85, in _execute
return self.cursor.execute(sql, params) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\utils.py",
line 89, in exit
raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py",
line 83, in _execute
return self.cursor.execute(sql) File "C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\oracle\base.py",
line 513, in execute
return self.cursor.execute(query, self._param_generator(params)) django.db.utils.DatabaseError: ORA-00955: name is already used by an
existing object
Here's my model.py file
from django.db import models
# Create your models here.
class yoman(models.Model):
text=models.CharField(max_length=200)
But I have checked using sql command line and no such db table or view exists.
p.s: The makemigrations command works properly and the migratiosn file has also been created.

Answer 1

You can print out the sql query if you edit the following file:
"C:\Users\Hp\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\oracle\base.py
On line 513, before the execute function is called add:
print(f'query')
Rerun the migration and you can see the sql that is failing to run. Either remove or rename the table/object in the db.