I'm trying to connect my Jupyter Notebook, I use Google Colab, with my local MySQL database. When I run this script in PyCharm, my preferred IDE, it works no problem. Only when I run it in Google Colab or Project Jupyter, both get the same error, does this happen.
import pymysql
import pandas as pd
mySQLuser = 'username'
mySQLpasswd = 'password'
mySQLhost = '127.0.0.1'
mySQLport = '3306'
mySQLdatabase = 'databasename'
connection = pymysql.connect(user = mySQLuser, passwd = mySQLpasswd, host = mySQLhost, port = mySQLport, db = mySQLdatabase)
I've also tried the same with sqlalchemy(create_engine) and mysql.connector, but get the same error.
OperationalError: (2003, "Can't connect to MySQL server on '127.0.0.1' ([Errno 111] Connection refused)")
I've also tried granting all privileges to the user and that didn't change anything. Another suggestion I've seen online is to null or change the bind-address in the configuration file (my.ini), but that didn't affect anything either.
Are you sure your colab/jupyter instances are run locally?
If that's not the case, you will not be able to access the SQL database on localhost (127.0.0.1) until you make your it accessible remotely (which implies several steps: making it accessible, changing the mySQLhost address in your code, authorizing connections from the host server in your SQL settings).
Got it to work. The service provider was rejecting the requests despite me configuring the network to allow it, but I sorted it out.
Related
I have a python application where I'm trying to access a MySQL database on Google's cloud service.
I've been following this set up guide for connecting via an external application (Python) and I am using the pymysql package. I'm attempting to connect via the proxy and have already authenticated my connection via gcloud auth log in from the console.
As of now, I CAN access the database via the console, but I need to be able to make queries from my python script to build it out. When I try running it as is, I get the following error:
OperationalError: (2003, "Can't connect to MySQL server on '34.86.47.192' (timed out)")
Here's the function I'm using, with security sensitive info starred out:
def uploadData():
# cd to the directory with the MySQL exe
os.chdir('C:\\Program Files\\MySQL\\MySQL Server 8.0\\bin')
# Invoke the proxy
subprocess.call('start cloud_sql_proxy_x64.exe -instances=trans-cosine-289719:us-east4:compuweather', shell=True)
# Create connection
# I have also tried host = '127.0.0.1' for localhost here
conn = pymysql.connect(host='34.86.47.192',
user='root',
password='*******',
db='gribdata')
try:
c = conn.cursor()
# Use the right databse
db_query = 'use gribdata'
c.execute(db_query)
query = 'SELECT * FROM clients'
c.execute(query)
result = c.fetchall()
print(result)
except Error as e:
print(e)
finally:
conn.close()
Yeah, this one's pretty limited in documentation, but what you want to do is run it from it's hosted IP and configure access to your external IP address on your server. So you want use that IP (34.xxx.xxx.xxx) rather than the loopback 127 local host IP.
To get it to work, you want to go to your connections tab and add a new connection within Gcloud. Make sure the public address box is checked, the IP is correct, and you save once done.
There's some excellent details here from some Gcloud engineers. Looks like some of the source documentation is outdated and this is the way to connect now.
First of all, confirm that the Cloud SQL proxy is indeed installed in the directory that you are expecting it to be. The Cloud SQL proxy is not part of MySQL Server, hence you should not find it in C:\\Program Files\\MySQL\\MySQL Server 8.0\\bin, at least by default. Instead, the Cloud SQL proxy is a tool provided by Google and is just an .exe file that can be stored in any directory you wish. For instructions on how to download the Proxy you can check the docs
The Cloud SQL proxy creates a secure link between the Cloud SQL instance and your machine. what it does is forward a local port in your machine to the Cloud SQL instance. Thus, the host IP that you should use if you are using the proxy is 127.0.0.1
conn = pymysql.connect(host='127.0.0.1',
user='root',
password='*******',
db='gribdata')
When starting the Cloud SQL Proxy with TCP socket, you should add the port to which you want to forward Cloud SQL's traffic at the end of the start command =tcp:3306
subprocess.call('start cloud_sql_proxy_x64.exe -instances=trans-cosine-289719:us-east4:compuweather=tcp:3306', shell=True)
Have you tried to connect CloudSQL from the console? Once you connected, you should get a message in the console displaying "Listening on 127.0.0.1:3306".Your connection command should be
"cloud_sql_proxy_x64.exe -instances=trans-cosine-289719:us-east4:compuweather=tcp:3306"
Try to connect cloud proxy from the console and try to create a connection with pymysql. Use "127.0.0.1".
I'm building a Python web app on Flask that use pyodbc to read data from a SQL Server database. Only trusted connection is allowed per the database's policy.
When I tried on my local, it works perfectly well. But when I hosted it on IIS (via WFastCGI) it's not working (Internal Server Error is raised) - failed to connect on below:
pyodbc.connect(blabla,trusted_connection = yes)
Just want to know how the user can get their credential and then continue connection to the SQL.
This call has worked for me in the past (connecting to SQL Server):
conn = pyodbc.connect(''''
TRUSTED_CONNECTION=Yes;
DRIVER={SQL Server};
SERVER={myServer};
DATABASE=myDB;''')
I used mysql.connector python library to make changes to my local SQL server databases using:
from __future__ import print_function
import mysql.connector as kk
cnx = kk.connect(user='root', password='password123',
host='localhost',
database='db')
cursor = cnx.cursor(buffered=True)
sql = "DELETE FROM examples WHERE id = 4"
number_of_rows = cursor.execute(sql)
cnx.commit()
cnx.close()
This works fine, but when i try the same code with a change only to the 'host' parameter, with something like,
host='xxx.xxx.xxx.xxx'
(where the IP is that of a server connected to my local network.), it won't update that particular data base in that server.
The error thrown is something like:
mysql.connector.errors.DatabaseError: 2003 (HY000): Can't connect to MySQL server on 'xx.xxx.x.xx' (10060)
Why wouldn't this work?
First, you must check if your local IP can acces to your remote server (check if you are an IP restriction on your server), after check if your mysql database use the default port or not, If not you must precise the port in your code.
Check if the database user you are using to connect to the database on the remote host has the correct access and privileges.
You can test this from the command line using:
mysql -u root -p password123 - h xxx.xxx.xxx.xxx db
If this does not work then debug as follow:
ping xxx.xxx.xxx.xxx. If host is reachable move on to next step, if not then this IP is blocked, not available or incorrect. Double check the IP and check that they are on the same network.
Check if mysqld is running on host. service mysqld restart. If it is move on to next step, if not start mysqld. If it does not want to start, install it, start the service and setup your database.
Telnet the specific port to see if the port is blocked. telnet xxx.xxx.xxx.xxx 3306. If this works, move on to the next step. If this does not work, check your IPTables and check if the port is open on the remote host.
Add a user to the mysql on the the host: https://dev.mysql.com/doc/refman/8.0/en/adding-users.html
Restart mysqld and try the command above again.
Trying to connect to an MS SQL server in Python.
import pymssql
server = '172.17.149.7\SQLEXPRESS'
user = 'test_user'
pw = 'test_pw'
db = 'test_db'
conn = pymssql.connect(server=server, user=user, password=pw, database=db)
Funny enough, this worked yesterday. Today, I get an error:
(20009, b'DB-Lib error message 20009, severity 9:\nUnable to connect:
Adaptive Server is unavailable or does not exist (172.17.149.7\\SQLEXPRESS)\n')
Looking into this, I found that the underlying FreeTDS already encounters problems when trying to connect.
tsql -S 172.17.149.7\SQLEXPRESS -U test_user -P test_pw
Error 20012 (severity 2):
Server name not found in configuration files.
locale is "de_DE.UTF-8"
locale charset is "UTF-8"
using default charset "UTF-8"
Error 20013 (severity 2):
Unknown host machine name.
Error 20009 (severity 9):
Unable to connect: Adaptive Server is unavailable or does not exist
There was a problem connecting to the server
From what I understand, it cannot find the server name in its configuration file freetds.conf. This is fine, I did not put it there (doing so does not make a difference) and after looking there it tries to find the server on the network. However, Unknown host machine name. seems to mean that the server cannot be found on the network. It then proceeds to not be able to connect to the server, since it apparently does not even see it.
It is there, though. Using a GUI (HeidiSQL) to connect to the database works just fine. Also, that very same code above worked just a day ago. I did not knowingly change anything in the meantime, just shutdown and restarted the computer.
What could be going on here?
I have a linux ubuntu server that I rent from DigitalOcean for storing streaming real time data in MySQL by coding with python.
Problem is that I am coding not in the linux server environment but in my local computer python(personal Windows 10(not a server)). So in the coding, I need to connect to my linux server in order to feed/get the data to/from the linux MySQL server.
I know I need to use MySQLdb library in python to do this. I tried to connect to my linux server by using this MySQLdb in python, but it could not connect to the server.
A different question:
For granting other ip addresses from which I am connect to the mysql server, should I do it whenever my ip address changes? for example, when I work at home I need to grant my home internet ip, and when I work other places do I need to grant that ip addresses?
Anyway, I tried granting to the ip address where I am connecting to the internet, but even after the granting I cannot access to the mysql server.4
What should I do?
Here is the code I used;
import MySQLdb
conn = MySQLdb.connect("000.000.000.0", "root", "password", "name of database")
"000.000.000.0" is the server that I rent and it is a linux server.
"root" is my username of the server
"password" is the password for the server as well as for the mysql.
and then the name of the database I want to connect to.
c = conn.cursor()
c.execute("SELECT * FROM practice")
here I just want to see what's in the "practice" table that I have made in the database.
rows = c.fetchall()
for eachRow in rows:
print eachRow
I don;t know what went wrong.
For Granting I used following code:
GRANT ALL ON nwn.* TO new_username#'00.000.000.00' IDENTIFIED BY 'new_password';
The ip address 00.000.000.000 is Starbucks ip address where I am working on this project right now.I got a message like this:
Query OK, 0 rows affected, 1 warning (0.03 sec)
After that I tried to connect in python on my local window python.And it didn't work and got this python error:
OperationalError: (2003, "Can't connect to MySQL server on '000.000.000.0' (10061)")
What's wrong with this?
Similar question have already been asked here.
Can you connect from your local OS to your remote Database?
mysql -u XXXX -h {IP} -p
Have you granted your client in the Database? Digital Ocean HowTo for this
Create an user for the remote access
GRANT SELECT,DELETE,INSERT,UPDATE ON tablename.* TO 'user'#'your_local_ip';
FLUSH PRIVILEGES;
It's good practice not to grant all privileges for remote users (scripts)
Your local IP should be a static IP, otherwise you have allways change ip or use a dynDNS like Service.
(EDIT)
I just set up an environment:
If you connect to an address that does not exist or the mysql/mariadb instance is not running you get errorcode 2003.'
(2003, "Can't connect to MySQL server on 'my_hostname' (61)")
If you're local host is not granted you get error 1130
(1130, "Host '213.213.213.213' is not allowed to connect to this MariaDB server")
To check if you can access your remote sql server try
mysql -h 123.123.123.123 -u username -p
on youre local windwos machine, where 123.123.123.123 is the IP Adress of your DigitalOcean Server.
To get your public IP Adress (outside of starbucks) you can visit a Site like this
If you REALLY used 0.0.0.0 as ip:
0.0.0.0 in service configuration as ip address is used to bind the service for external access. 0.0.0.0 is like a joker for every ip, but can not be used to access the server/service remotely.