How to drop all tables from the database with manage py CLI in Django

Question

How can I drop all tables from a database using manage py and command line  Is there any way to do that executing manage py with appropriate parameters so I can execute it from a  NET application

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This answer is for postgresql DB   Run      echo  drop owned by some user      manage py dbshell  NOTE  some user is the name of the user you use to access the database  see settings py file   default database          ENGINE    django db backends postgresql psycopg2        NAME    somedbname        USER    some user        PASSWORD    somepass        HOST    postgresql        PORT

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As far as I know there is no management command to drop all tables  If you don t mind hacking Python you can write your own custom command to do that  You may find the sqlclear option interesting  Documentation says that   manage py sqlclear Prints the DROP TABLE SQL statements for the given app name s    Update   Shamelessly appropriating  Mike DeSimone s comment below this answer to give a complete answer     manage py sqlclear     manage py dbshell   As of django 1 9 it s now   manage py sqlflush

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There s an even simpler answer if you want to delete ALL your tables  You just go to your folder containing the database  which may be called mydatabase db  and right-click the  db file and push  delete   Old fashioned way  sure-fire to work

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If you re using the South package to handle database migrations  highly recommended   then you could just use the   manage py migrate appname zero command   Otherwise  I d recommend the   manage py dbshell command  piping in SQL commands on standard input

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Using Python to make a flushproject command  you use    from django db import connection cursor   connection cursor   cursor execute    DROP DATABASE  s       connection settings dict  NAME     cursor execute    CREATE DATABASE  s       connection settings dict  NAME

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If you are using psql and have django-more 2 0 0 installed  you can do  manage py reset schema

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Here s an example Makefile to do some nice things with multiple settings files   test      python manage py test --settings my project test  db drop      echo  DROP DATABASE my project development       manage py dbshell     echo  DROP DATABASE my project test       manage py dbshell  db create      echo  CREATE DATABASE my project development       manage py dbshell     echo  CREATE DATABASE my project test       manage py dbshell  db migrate      python manage py migrate --settings my project base     python manage py migrate --settings my project test  db reset  db drop db create db migrate   PHONY  test db drop db create db migrate db reset   Then you can do things like     make db reset

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I would recommend you to install django-extensions and use python manage py reset db command  It does exactly what you want

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If you want to completely wipe the database and resync it in the same go you need something like the following  I also combine adding test data in this command      usr bin env python  import os os environ setdefault  DJANGO SETTINGS MODULE    main settings     Replace with your app name   from django db import connection from django core management import call command from django conf import settings   If you re using postgres you can t use django s sql stuff for some reason that I   can t remember  It has to do with that autocommit thing I think    import psychodb2 as db  def recreateDb        print  Wiping database       dbinfo   settings DATABASES  default          Postgres version      conn   db connect host dbinfo  HOST    user dbinfo  USER                          password dbinfo  PASSWORD    port int dbinfo  PORT   or 5432        conn autocommit   True      cursor   conn cursor        cursor execute  DROP DATABASE     dbinfo  NAME         cursor execute  CREATE DATABASE     dbinfo  NAME       WITH ENCODING  UTF8      Default is UTF8  but can be changed so lets be sure         Mysql version      print  Dropping and creating database     dbinfo  NAME        cursor   connection cursor       cursor execute  DROP DATABASE     dbinfo  NAME        CREATE DATABASE     dbinfo  NAME        USE     dbinfo  NAME              print  Done     if   name         main         recreateDb        print  Syncing DB       call command  syncdb   interactive False      print  Adding test data       addTestData           It would be nice to be able to do cursor execute call command  sqlclear    main    but call command prints the SQL to stdout rather than returning it as a string  and I can t work out the sql delete code

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Here s a south migration version of  peter-g s answer   I often fiddle with raw sql  so this comes in handy as 0001 initial py for any befuddled apps  It will only work on DBs that support SHOW TABLES  like mysql   Substitute something like SELECT table name FROM information schema tables WHERE table schema    public   if you use PostgreSQL  Also  I often do this exact same thing for both the forwards and backwards migrations   from south db import db from south v2 import SchemaMigration from django db utils import DatabaseError from os import path from logging import getLogger logger   getLogger   name      class Migration SchemaMigration        def forwards self  orm            app name   path basename path split path split path abspath   file     0   0           table tuples   db execute r SHOW TABLES             for tt in table tuples              table   tt 0              if not table startswith app name                         continue             try                  logger warn  Deleting db table  s        table                  db delete table table              except DatabaseError                  from traceback import format exc                 logger error  Error running  s   n  s     repr self forwards   format exc       Coworker cocoders would kill me if they knew I did this  though

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Here s a shell script I ended up piecing together to deal with this issue   Hope it saves someone some time      bin sh  drop         echo  Droping all tables prefixed with  1        echo     echo  show tables      manage py dbshell       egrep    1     xargs -I      echo  DROP TABLE              manage py dbshell     echo  Tables dropped       echo    cancel         echo  Cancelling Table Drop       echo    if   -z   1     then     echo  Please specify a table prefix to drop   else     echo  Drop all tables with  1  prefix       select choice in drop cancel do          choice  1         break     done fi

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There s no native Django management command to drop all tables  Both sqlclear and reset require an app name   However  you can install Django Extensions which gives you manage py reset db  which does exactly what you want  and gives you access to many more useful management commands

User · Answer

simple    way to do it from python  on mysql    from django db import connection  cursor   connection cursor   cursor execute  show tables    parts     DROP TABLE IF EXISTS  s     table for  table   in cursor fetchall    sql    SET FOREIGN KEY CHECKS   0  n      n  join parts     SET FOREIGN KEY CHECKS   1  n  connection cursor   execute sql

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python manage py migrate  lt app gt  zero  sqlclear was removed from 1 9   Release notes mention that it is due to the introduction of migrations  https   docs djangoproject com en 1 9 releases 1 9   Unfortunately I could not find a method that works on all apps at once  nor a built-in way to list all installed apps from the admin  How to list all installed apps with manage py in Django   Related  How to reset migrations in Django 1 7

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The command   manage py sqlclear or   manage py sqlflush seems to clear the table and not delete them  however if you want to delete the complete database try this   manage py flush   Warning  this will delete your database completely and you will lose all your data  so if that not important go ahead and try it

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Drops all tables and recreates them   python manage py sqlclear app1 app2 appN   sed -n  2  p    sed -n     p    sed  s      CASCADE      sed -e  1s   BEGIN    -e   s   COMMIT      python manage py dbshell python manage py syncdb   Explanation   manage py sqlclear -  prints the DROP TABLE SQL statements for the given app name s    sed -n  2  p  - grabs all lines except first line  sed -n     p  - grabs all lines except last line  sed  s      CASCADE    - replaces all semicolons     with  CASCADE    sed -e  1s   BEGIN    -e   s   COMMIT    - inserts  BEGIN   as first text  inserts  COMMIT   as last text  manage py dbshell -  Runs the command-line client for the database engine specified in your ENGINE setting  with the connection parameters specified in your USER  PASSWORD  etc   settings   manage py syncdb -  Creates the database tables for all apps in INSTALLED APPS whose tables have not already been created   Dependencies    sed  to use on Windows  I installed UnxUtils   Download   Installation Instructions      Credits    Manoj Govindan and  Mike DeSimone for sqlclear piped to dbshell   jpic for  sed  s      CASCADE

User · Answer

It is better to use   manage py sqlflush     manage py dbshell because sqlclear requires app to flush

User · Answer

use  python manage py sqlflush  command in windows 10 for others type manage py

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