How to erase table data in Django?
I wrote a simple script for populating the table created with Django models. I did make mistakes during the development process and have corrupted data in my table (it is accessible but has wrong images, names, urls). I want to erase this data and start the populating over, but it looks like the table stores previous primary keys (so the new objects do not start from
pk=1) if I just use
How can I erase all the previous data without
DROP TABLE? If
DROP is the most convenient way, is this Django : Table doesn't exist solution for restoring is the only one?
The desired functionality is erasing data before every script run, automatically. Thank you in advance.
You can just use
Removes all data from the database and re-executes any post-synchronization handlers. The table of which migrations have been applied is not cleared.
Are there any ways to use flush just for the set of tables, not database?
No, not really. Flush has an option to specify what database you're flushing (
-database) but you can't specify certain tables since that has the possibility of breaking relationships between tables which would invalidate data.
If you really need to do this, you could of course make your own command that will just go through the tables and delete the objects but this of course won't do the
post-synchronization steps that flush does
How to Delete All Objects of a Database Table in Django, We can actually execute these SQL statements, and thus wipe out all the DB tables in our database, by running: $ python manage.py sqlflush� Besides being done in the views.py file, this can also be done in the Python shell by writing the line, py manage.py shell, in the command prompt of your computer. And this is all that is required to delete all objects from a database table in Django.
There is a way to drop only the tables of a given django app and not the whole database: you can use
sqlclear and pipe it to
dbshell management command.
python manage.py sqlclear app_name | python manage.py dbshell
The command can be applied only if the app has no migrations. See here more info.
Clearing the database with Django commands, You gotta go to the DB and delete it all from there. I'd recommend just dropping all the tables and then building them from scratch with the migrations commands. While flushruns deleteto wipe all data from the tables, sqlclearremoves the actual tables. So in order to be able to work with the database, these tables have to be re-created. Worry not, there's a command for that: $ python manage.py sql blogapp
I also needed a way to clear particular tables before using loaddata to backport data to test environments. This works for a particular table:
echo "delete from my_table" | python manage.py dbshell
Is there any way to delete all the data but keep the tables in Django , As an example, we have the sqlflush command, which returns a list of the SQL statements required to return all tables in the database to the state� Follow below steps to manually drop table dept_emp_employee_dept. Go to Django project root folder in a terminal. Run below command to go to Django dbshell. $ python3 manage.py dbshell SQLite version 3.22.0 2018-01-22 18:45:57 Enter ".help" for usage hints. Run .tables to list all tables in current SQLite3 database. sqlite> .tables ..
Clearing the Database with Django Commands, delete() - Performs an SQL delete query on all rows in the QuerySet and returns the number of objects deleted and a dictionary with the number of dele… Handy!) The fast and maintainable way: _raw_delete() The second fastest way to bulk delete entries in the database with Django is to use the private method _raw_delete. I got this idea when my colleague pointed me to this [answer on Stack Overflow]2.
delete - django - Python documentation, Deletion in the Django ORM (i.e. the QuerySet.delete() method) What you'll see is that in order to delete records from a table, Django first� If you don't care about data: Best way would be to drop the database and run syncdb again. Or you can run: For Django >= 1.5. python manage.py flush For Django < 1.5. python manage.py reset appname (you can add --no-input to the end of the command for it to skip the interactive prompt.) If you do care about data: From the docs:
Deletion in the Django ORM (Example), Deleting a record To delete a record in the database, we must use the delete() method. Removing items is easier than changing items, because the method is� Delete the sqlite database file (often db.sqlite3) in your django project folder (or wherever you placed it) Delete everything except __init__.py file from migration folder in all django apps; Make changes in your models (models.py). Run the command python manage.py makemigrations or python3 manage.py makemigrations