Develop Reference

MySQL Connector/Python Error "Lost connection to MySQL server / Connection reset by peer"

I am new to Python and mySQL and I am trying to get the following Python script running as a CGI on an hosted webserver:
#!/usr/bin/python3
import cgi
import sys
sys.path.append("PATH TO SIDE PACKAGES DUE TO MISSING ROOT ACCESS")
import mysql.connector
from mysql.connector import Error
print('Content-type: text/html') # the mime-type header.
print() # header must be separated from body by 1 empty line.
try:
connection_config_dict = {
'user': 'MY_USER',
'password': 'MY_PASSWORD',
'host': 'rdbms.strato.de',
'database': 'MY_DATABASE',
}
connection = mysql.connector.connect(**connection_config_dict)
if connection.is_connected():
db_Info = connection.get_server_info()
print("Connected to MySQL Server version ", db_Info)
cursor = connection.cursor()
cursor.execute("select database();")
record = cursor.fetchone()
print("Your connected to database: ", record)
except Error as e:
print("Error while connecting to MySQL", e)
finally:
if connection.is_connected():
cursor.close()
connection.close()
print("MySQL connection is closed")
Unfortunately, this results in the following error message:
Error while connecting to MySQL 2055: Lost connection to MySQL server at 'rdbms.strato.de:3306',
system error: 104 Connection reset by peer
I looked up older threads with the error message and while I could find both separately, I did not find them in this combo, therefore I hope there might be someone having an idea for a solution before I deal with the horrible customer service of my provider again. To me as a newbie it seems like the server declines the connection, even though I am coming from inside the network (running as a CGI on the server).
Some more information about the environment: The Python version is 3.8.1, mySQL server version 5.7, mysql_connector_python version 8.0.23. Since it is a hosted webserver I do not have root access, therefore I installed additional modules with pip --user via ssh and added the path to the script which works fine with other modules like requests. I am also certain that the mySQL login data is correct, since it works flawlessly with a PHP script.
Thanks in advance for helping out!

How to connect to a remote Windows machine to change mdb file using python?

I am new to Python and I am trying to make a script that connects to a remote windows machine and change mdb file there. I can’t figure out how to work with the WMI library.
When I need to change mdb file (Access database) on my machine, I just use pyodbc connect. For example like this:
connStr = pyodbc.connect(r'DRIVER={Microsoft Access Driver (*.mdb)};'
r'DBQ=C:\Komax\Data\Topwin\DatabaseServer.mdb;')
cursor = connStr.cursor()
But now I need to run code on my machine so that it modifies the file (mdb) on the other machine. It seems like I have to use this code below to connect to remote machine, but I don't know what to do next, how to use connection. Please, help me to solve the problem :)
ip = "192.168.18.74"
username = "admin"
password = "komax"
from socket import *
try:
print("Establishing connection to %s" % ip)
connection = wmi.WMI(ip, user=username, password=password)
print("Connection established")
except wmi.x_wmi:
print("Your Username and Password of "+getfqdn(ip)+" are wrong.")

raspberry pi sending data to a XAMPP database

I have the following code in python for sending data to a mysql database
import time
import datetime
import MySQLdb
from time import strftime
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
PIR_PIN = 21
GPIO.setup(PIR_PIN, GPIO.IN)
# Variables for MySQL
db = MySQLdb.connect(host="*******", user="root",passwd="*****", db="sensor1")
cur = db.cursor()
while True:
i = GPIO.input(PIR_PIN)
print i
datetimeWrite = (time.strftime("%Y-%m-%d ") + time.strftime("%H:%M:%S"))
print datetimeWrite
sql = ("""INSERT INTO templog (datetime,temperature) VALUES (%s,%s)""",(datetimeWrite,i))
try:
print "Writing to database..."
# Execute the SQL command
cur.execute(*sql)
# Commit your changes in the database
db.commit()
print "Write Complete"
except:
# Rollback in case there is any error
db.rollback()
print "Failed writing to database"
cur.close()
db.close()
break
My problem is that my XAMPP server is installed in pc where I want to view the the data from raspberry pi in mysql database.
So for getting the connection established what should I write in host= "?"

The connection-string should be like this:
db = MySQLdb.connect(host="192.168.0.xxx", user="root",passwd="*****", db="sensor1")
See this Question

Host will be IP address of your system on which XAMPP is installed e.g. 192.168.x.x

Closing connection to hbase database using happybase in python

def hbasePopulate(self,table="abc",MachineIP="xx.xx.xx.xx"):
connection=happybase.Connection(MachineIP,autoconnect=True)
tablename=Reptype.lower()+'rep'
print "Connecting to table "
print tablename
try:
table=connection.table(tablename)
for key,data in table.scan():
print key,data
print table
#except IOError as e:
except:
print "Table does not exists,creating"
self.createTable(table=table,machineIP=machineIP)
with table.batch() as b:
with open('xxx.csv','r') as queryFile:
for lines in queryFile:
lines=lines.strip("\n")
splitRecord=lines.split(",")
key=splitRecord[0]
key=key.replace("'","")
val=",".join(splitRecord[1:])
val=ast.literal_eval(val)
table.put(splitRecord[0],val)
for key,data in table.scan():
print key,data
def createTable(self,table="abc",MachineIP=""):
connection=happybase.Connection(MachineIP,autoconnect=True)
print "Connection Handle",connection
tname=table.lower()
tablename=str(tname)
print "Creating table : "+table+", On Hbase machine : "+MachineIP
families={"cf":{} ,} #using default column family
connection.create_table(table,families=families)
print "Creating table done "
Every time I run this script it populated data to hbase table but it leaves a connection open. When I check using netstat -an I see the connection count has increased which persists even after the script completes.
Am I missing something? Do we need to explicitly close connection?
Thanks for helping.

Got the solution .Turns out to be this
try:
connection.close()
except Exception as e:
print "Unable to close connection to hbase "
print e

If the program exited, any network connections are automatically closed. What you're likely seeing is the TIME_WAIT state for already closed connections.

Python try connecting to multiple mysqldb hosts

Wondering if there is a way to use a python script to attempt a connection to a group mysql database hosts? Ideally there would be X number of hosts and it would try connecting to each, then fail if no connection could be made. I do not believe MySQLdb.connect is capable of handling multiple hosts, maybe I am wrong.

mysqldb.connect is perfectly ok with connecting to multiple hosts:
try:
conn1 = mysqldb.connect(...)
conn2 = mysqldb.connect(...)
...
except: # add specific exception here
... # support failure when connecting