Develop Reference

OperationalError in django when adding a new record

I have created a mysql database with Cpanel . And I have some settings for database in the settings.py :
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': '*****_db',
'USER': '******',
'PASSWORD': '********',
'HOST': 'localhost',
'PORT': '3306',
'OPTIONS': { 'init_command': 'SET storage_engine=INNODB,character_set_connection=utf8,collation_connection=utf8_unicode_ci'
}
}
}
but the problem is when I try to add a new record in django-admin with some arabic chars , I get this error :
OperationalError at /admin/courses/arguments/add/
(1366, "Incorrect string value: '\\xD8\\xB3\\xDA\\xAF' for column `asiatrad_db`.`courses_arguments`.`name` at row 1")
What is the problem ? Do I need to create a new database with charset on utf-8 ?

The “utf8” encoding only supports three bytes per character. The real UTF-8 encoding, which everybody uses, needs up to four bytes per character. See this article.
So use “utf8mb4” charset instead of “utf8”.
The settings.py should look as follows:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': '*****_db',
'USER': '******',
'PASSWORD': '********',
'HOST': 'localhost',
'PORT': '3306',
'OPTIONS': { 'init_command': 'SET storage_engine=INNODB','charset': 'utf8mb4'}
}

getting ConnectionDoesNotExist error when attempting to migrate mysql database in django

here's my code in django settings.py for the database:
DATABASES= {
'defualt': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'cameronkc',
'USER': 'root',
'PASSWORD': '123456',
'HOST': 'localhost',
'PORT': ''
}
}
here's the error im recieving when executing >python manage.py migrate in command prompt
django.db.utils.ConnectionDoesNotExist: The connection default doesn't exist

You misspelled default in your DATABASES dict. Change 'defualt' to 'default'.

Multiple Databases --Migrations

I am using 2 postgres databases in my django app.
'newpostgre': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'new_postgre2',
'USER': 'tester',
'PASSWORD': 'password',
'HOST': 'localhost',
'PORT': '',
},
'newpostgre2': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'new_postgre3',
'USER': 'tester',
'PASSWORD': 'password',
'HOST': 'localhost',
'PORT': '',
},
I have a very simple model
class Check1(models.Model):
title = models.CharField(max_length=100)
I had run
python manage.py migrate --database=newpostgre
python manage.py migrate --database=newpostgre2
when I open my new_postgre2(for newpostgre) database in postgre, I can see my Check1 table there.
But in my new_postgre3(for newpostgre2) database in postgre, no Check1 table is there, only those initial migrations are there.
Why I can't see my table in new_postgre3 when migrations have been successfully made?

Because The same object name can be used in different schemas sometimes conflict. The best practice allow many users to use one database without interfering with each other. Use this change second database user and check again. I think it is work.
'newpostgre': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'new_postgre2',
'USER': 'tester',
'PASSWORD': 'password',
'HOST': 'localhost',
'PORT': '',
},
'newpostgre2': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'new_postgre3',
'USER': 'tester_different',
'PASSWORD': 'password_different',
'HOST': 'localhost',
'PORT': '',
},
python manage.py migrate --database=newpostgre2

postgresql django not sending password

I am getting the error OperationalError: fe_sendauth: no password supplied on my production server but I cannot see why...
settings.py
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'dbname',
'USER': 'dbuser',
'PASSWORD': PROD_DB_PASSWORD,
'HOST': 'localhost',
'PORT': '5432',
}
}
pg_hba.conf:
host dbname dbuser localhost md5
If I do psql -d dbname -U dbuser -h localhost and then enter the password at the prompt I can see that it works so IDK why django is not sending the password and IDK where to look from here.

I suspect you're not passing the password correctly. Here's how you debug. After the DATABASES line in settings.py, can you try printing out the dict.
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'dbname',
'USER': 'dbuser',
'PASSWORD': PROD_DB_PASSWORD,
'HOST': 'localhost',
'PORT': '5432',
}
}
print DATABASES
Then manage.py runserver as you would.
See if the password is properly passed. Apologies my rep's not enough to comment yet.

For future readers also check the spelling and later cases. All database keys must be in UPPER CASE e.g ENGINE, NAME, USER, PASSWORD, HOST and PORT.
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.getenv("DB_NAME", "db_name"),
"USER": os.getenv("DB_USERNAME", "db_user"),
"PASSWORD": os.getenv("DB_PASSWORD", "db#password"),
"HOST": os.getenv("DB_HOST", "localhost"),
"PORT": os.getenv("DB_PORT", "5432")
}
}

Why I cannot create a database for graphite-web?

I am trying to install graphite-web on my computer by following the instructions on
https://gist.github.com/surjikal/2777886. When I try to populate the database with manage.py syncdb it does not find a proper database throwing the following error:
> sudo python manage.py syncdb
OperationalError: FATAL: database "/opt/graphite/storage/graphite.db" does not exist
Here you can find my database configuration from local_settings.py:
DATABASES = {
'default': {
'NAME': '/opt/graphite/storage/graphite.db',
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'USER': 'graphite',
'PASSWORD': '<password>',
'HOST': 'localhost',
'PORT': '5678'
}
}
Postgres is running properly:
sudo service --status-all | grep postgres
...
[ + ] postgresql
Why manage.py syncdb cannot create / find the graphite.db file?

If you are using postgresql then database path will not be required. You just need database name. like
DATABASES = {
'default': {
'NAME': 'graphite',
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'USER': 'graphite',
'PASSWORD': '<password>',
'HOST': 'localhost',
'PORT': '5678'
}
}