"Access denied for user" when password contains special characters

Question

I have been searching SO and the web for days trying to solve this issue. There are plenty of similar questions on SO but none of them seem to be the same issue that I am dealing with currently. I am trying to connect to a remote MySQL database in python to use the pandas.to_sql feature to update tables. I am able to connect with MySQL workbench without any issue. I am also able to connect using the following code:

self.conn = mysql.connector.connect(host= remote_host,user= db_user, password=db_pass)

This allows me to query the database just fine in python. However, in order to use the pandas.to_sql I need to create and engine with sqlalchemy. I have tried multiple different ports and even leaving the port off. Here is the code I have tried:

self.engine = create_engine("mysql+mysqlconnector://db_user:db_pass@remote_host:3306/db_name")

They all give me the following error

ProgrammingError: (mysql.connector.errors.ProgrammingError) 1045 (28000): Access denied for user 'db_user'@'c-67-176-125-82.hsd1.co.comcast.net' (using password: YES) (Background on this error at: http://sqlalche.me/e/f405)

I can use the create_engine to connect to a local database but just not a remote database.

I have tried restarting MySQL on the server, I have granted all privileges to the user and flushed all the privileges on the server. I have even tried using the root user and password with no success.

I double checked the username and password, and of course know they are correct as they are the ones I use in MySQL Workbench, plus when I just use mysql.connector.connect

I even tried uninstalling mysql-connector-python and reinstalling it.

Any help would be greatly appreciated.

Asked By: Alstar158

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Source

Answer 1

If any of the constituent parts of the database URL might contain special characters that would potentially confuse the URL parser it is best to have sqlalchemy.engine.URL.create() construct the URL for you. For example:

import sqlalchemy as sa

connection_url = sa.engine.URL.create(drivername="mysql+pymysql",
                                   username="db_user",
                                   password="my:password",
                                   host="localhost",
                                   port="3307",
                                   database="mydb",
                                   )
print(connection_url)
# mysql+pymysql://db_user:my%3Apassword@localhost:3307/mydb

Notice that the colon character in the password is percent-encoded as %3A.

Answered By: Gord Thompson

"Access denied for user" when password contains special characters

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