How to connect MySQL database using Python (mysql.connector) remotely?

What I want to implement is a Python script that performs operations on a database.

The database is hosted on a PC A [it is my personal PC (OS = Windows 10), on which I have installed XAMMP to manage a db (’‘MySQL’’)].
Through phpMyAdmin I created 2 types of user:

  1. Root “type” user: with this user I can only access from the PC on which the DB is present (from “localhost”);
  2. Generic “type” user: with this user I want to access the DB on PC A, through the Python script, from any host (in alternative, from a specific remote host different from “localhost”).

The problem is that I cannot connect from a remote host (different from “localhost”) to the database hosted on PC A by the “generic” user via the Python script.

I forwed port “3306” on the firewall and modify the configuration file “my.ini” as follows (specifically I entered bind-address = 0.0.0.0), but without success:

Example MySQL config file for small systems.

#
# This is for a system with little memory (<= 64M) where MySQL is only used
# from time to time and it's important that the mysqld daemon
# doesn't use much resources.
#
# You can copy this file to
# C:/xampp/mysql/bin/my.cnf to set global options,
# mysql-data-dir/my.cnf to set server-specific options (in this
# installation this directory is C:/xampp/mysql/data) or
# ~/.my.cnf to set user-specific options.
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.


# The following options will be passed to all MySQL clients
[client]
# password       = your_password
port=3306
socket="C:/xampp/mysql/mysql.sock"




# Here follows entries for some specific programs


# The MySQL server
default-character-set=utf8mb4
[mysqld]
port=3306
socket="C:/xampp/mysql/mysql.sock"
basedir="C:/xampp/mysql"
tmpdir="C:/xampp/tmp"
datadir="C:/xampp/mysql/data"
pid_file="mysql.pid"
# enable-named-pipe
key_buffer=16M
max_allowed_packet=1M
sort_buffer_size=512K
net_buffer_length=8K
read_buffer_size=256K
read_rnd_buffer_size=512K
myisam_sort_buffer_size=8M
log_error="mysql_error.log"


# Change here for bind listening
bind-address=0.0.0.0
# bind-address = ::1          # for ipv6


# Where do all the plugins live
plugin_dir="C:/xampp/mysql/lib/plugin/"


# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
# commented in by lampp security
#skip-networking
#skip-federated


# Replication Master Server (default)
# binary logging is required for replication
# log-bin deactivated by default since XAMPP 1.4.11
#log-bin=mysql-bin


# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id   =1


# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 2
#
# The replication master for this slave - required
#master-host     =   <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port     =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin




# Point the following paths to different dedicated disks
#tmpdir = "C:/xampp/tmp"
#log-update = /path-to-dedicated-directory/hostname


# Uncomment the following if you are using BDB tables
#bdb_cache_size = 4M
#bdb_max_lock = 10000


# Comment the following if you are using InnoDB tables
#skip-innodb
innodb_data_home_dir="C:/xampp/mysql/data"
innodb_data_file_path=ibdata1:10M:autoextend
innodb_log_group_home_dir="C:/xampp/mysql/data"
#innodb_log_arch_dir = "C:/xampp/mysql/data"
## You can set .._buffer_pool_size up to 50 - 80 %
## of RAM but beware of setting memory usage too high
innodb_buffer_pool_size=16M
## Set .._log_file_size to 25 % of buffer pool size
innodb_log_file_size=5M
innodb_log_buffer_size=8M
innodb_flush_log_at_trx_commit=1
innodb_lock_wait_timeout=50


## UTF 8 Settings
#init-connect=\'SET NAMES utf8\'
#collation_server=utf8_unicode_ci
#character_set_server=utf8
#skip-character-set-client-handshake
#character_sets-dir="C:/xampp/mysql/share/charsets"
sql_mode=NO_ZERO_IN_DATE,NO_ZERO_DATE,NO_ENGINE_SUBSTITUTION
log_bin_trust_function_creators=1


character-set-server=utf8mb4
collation-server=utf8mb4_general_ci
[mysqldump]
max_allowed_packet=16M


[mysql]
# Remove the next comment character if you are not familiar with SQL
#safe-updates


[isamchk]
key_buffer=20M
sort_buffer_size=20M
read_buffer=2M
write_buffer=2M


[myisamchk]
key_buffer=20M
sort_buffer_size=20M
read_buffer=2M
write_buffer=2M


[mysqlhotcopy]

Below the Python code to establish the connection with the DB:

import mysql.connector as mysql
import socket

hostname = socket.gethostname()
IP_address = socket.gethostbyname(hostname)


user=input("User: ")
password=input("Password: ")


db=mysql.connect(
    host=IP_address,
    user=user,
    port=3306,
    password=password,
    database="Example_db")


print("connected to: ",db.get_server_info())

If I use the user “root” from the “localhost” I can connect to the DB otherwise the connection fails (E.g. From a remote host different from localhost, Connected to the same Home LAN network).

What can I do to connect “remotely”?

Hello! Welcome to the community :partying_face:!

Did you create a MySQL user whose domain is not localhost?

If you login to your MySQL database and query the users (SELECT user, host FROM mysql.user) you should see that the host is always localhost, which means that you can only connect through your local machine.

The easiest and most insecure way to fix this is to update the user you want (ideally not root) to allow any host:

UPDATE mysql.user SET host = '%' WHERE user = 'the_user' AND host = 'localhost'.

After that, update mysql.db:

UPDATE mysql.db SET host='%' WHERE host='localhost' AND User='the_user';

And finally, reset the privileges:

FLUSH PRIVILEGES;

With that you should be able to connect to it from a remote host.

1 Like

Hello @skaparate ! Thanks so much for your interest about my problem :slight_smile:

Yes, I created a user with the features you described with phpMyAdmin shown below:

But, when I run python script on PC “B” (remote host) to connect the db hosted on PC “A” I get the following error:

Traceback (most recent call last):
  File "mysql\connector\network.py", line 574, in open_connection
ConnectionRefusedError: [WinError 10061] Impossibile stabilire la connessione. Rifiuto persistente del computer di destinazione

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "mysql\connector\locales\__init__.py", line 55, in get_client_error
ModuleNotFoundError: No module named 'mysql.connector.locales.eng'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "mysql\connector\connection.py", line 426, in _open_connection
  File "mysql\connector\network.py", line 576, in open_connection
  File "mysql\connector\errors.py", line 186, in __init__
  File "mysql\connector\locales\__init__.py", line 58, in get_client_error
ImportError: No localization support for language 'eng'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "mysql\connector\network.py", line 161, in send_plain
OSError: [WinError 10057] Socket non connesso e indirizzo non fornito durante l'invio su un socket di datagramma che utilizza una chiamata sendto. Richiesta di invio o ricezione di dati annullata

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "mysql\connector\locales\__init__.py", line 55, in get_client_error
ModuleNotFoundError: No module named 'mysql.connector.locales.eng'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "mysql\connector\connection.py", line 114, in __init__
  File "mysql\connector\abstracts.py", line 1014, in connect
  File "mysql\connector\connection.py", line 438, in _open_connection
  File "mysql\connector\connection.py", line 473, in close
  File "mysql\connector\connection.py", line 937, in cmd_quit
  File "mysql\connector\network.py", line 163, in send_plain
  File "mysql\connector\errors.py", line 186, in __init__
  File "mysql\connector\locales\__init__.py", line 58, in get_client_error
ImportError: No localization support for language 'eng'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "mysql\connector\network.py", line 161, in send_plain
OSError: [WinError 10057] Socket non connesso e indirizzo non fornito durante l'invio su un socket di datagramma che utilizza una chiamata sendto. Richiesta di invio o ricezione di dati annullata

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "mysql\connector\locales\__init__.py", line 55, in get_client_error
ModuleNotFoundError: No module named 'mysql.connector.locales.eng'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "main.py", line 13, in <module>
  File "mysql\connector\__init__.py", line 273, in connect
  File "mysql\connector\connection.py", line 117, in __init__
  File "mysql\connector\connection.py", line 473, in close
  File "mysql\connector\connection.py", line 937, in cmd_quit
  File "mysql\connector\network.py", line 163, in send_plain
  File "mysql\connector\errors.py", line 186, in __init__
  File "mysql\connector\locales\__init__.py", line 58, in get_client_error
ImportError: No localization support for language 'eng'
[8228] Failed to execute script main

i don’t really know how to fix it :frowning:

Can you print this variable IP_address? Does it match the IP of your database host?

What if, instead of retrieving the IP of the hostname, you just put the IP directly into the code, like in this sample?

If it doesn’t work, make sure you can connect to your db host using telnet: telnet DB_IP 3306, where DB_IP is the IP of your database host.

1 Like

I made a really stupid mistake :sweat_smile:

I got the IP address of the PC “B” instead of PC “A”.

Thanks so much @skaparate for help me !!!

1 Like