How can I make the connection to the msssql database using pymsssql?
Below is a snippet of my code where I try to make the connection encrypted
conn = pymssql.connect(
server=conn.host,
user=conn.login,
password=conn.password,
database=self.schema or conn.schema,
port=conn.port,
)
return conn
Related
I am using mysql connect in the python script.
Python script needs to work for long time
It works fine for a few hours but it has issues to connect mysql after some hours
Here is my codes.
Code to connect mysql
host = "localhost"
user = "root"
def get_connection():
connection = mysql.connector.connect(
host=host,
user=user,
password=password,
database=database
)
return connection
Script repeats below codes to insert the results
connection = get_connection()
cursor = connection.cursor()
cursor.executemany(insert_query, records_to_insert)
connection.commit()
posts = cursor.rowcount + 1
cursor.execute("""UPDATE topics set posts=%s WHERE tid=%s""", (posts, topic_id, ))
connection.commit()
cursor.close()
connection.close()
Could you give me a solution to resolve my issues?
Thanks.
I am a beginner in python and mysql. I have a small application written in Python that connects to remote mysql server. There is no issues to connect and fetch data. It works fine then the code is outside a function. As I want to close and open connections, execute different queries from several functions inside my application, I would like to be able to call a function to establish a connection or run a query as needed. It seems that when I create an connection, that connection can not be used outside the function. I would like to implement something like this:
mydbConnection():
....
mydbQuery():
....
connected = mydbConnection()
myslq = 'SELECT *.......'
result = mydbQuery(mysql)
And so on...
Thanks for any direction on this.
import mysql.connector
from mysql.connector import Error
def mydbConnection(host_name, user_name, user_password):
connection = None
try:
connection = mysql.connector.connect(
host=host_name,
user=user_name,
passwd=user_password
)
print("Connection to MySQL DB successful")
except Error as e:
print(f"The error '{e}' occurred")
return connection
connection = mydbConnection("localhost", "root", "")
In the above script, you define a function mydbConnection() that accepts three parameters:
host_name
user_name
user_password
The mysql.connector Python SQL module contains a method .connect() that you use in line 7 to connect to a MySQL database server. Once the connection is established, the connection object is returned to the calling function. Finally, in line 18 you call mydbConnection() with the host name, username, and password.
Now, to use this connect variable, here is a function:
def mydbQuery(connection, query):
cursor = connection.cursor()
try:
cursor.execute(query)
print("Database created successfully")
except Error as e:
print(f"The error '{e}' occurred")
To execute queries, you use the cursor object. The query to be executed is passed to cursor.execute() in string format.
Create a database named db for your social media app in the MySQL database server:
create_database_query = "CREATE DATABASE db"
mydbQuery(connection, create_database_query)
I am having problems connecting to a remote Oracle DB using cx_Oracle in my python application.
I have tried a lot of different ways of configuring/formulating my connection string based on a lot of google searching etc but I seem to get the same error message almost each time no matter what I try.
My attempts looks like this:
import cx_Oracle
ip = '[IP ADDRESS]'
port = [PORT]
service_name = '[SERVICE NAME]'
dsn = cx_Oracle.makedsn(ip, port, service_name=service_name)
db = cx_Oracle.connect('[USERNAME]', '[PASSWORD], dsn)
Result: DatabaseError: ORA-12170: TNS:Connect timeout occurred
import cx_Oracle
conn_str = '[USERNAME]/[PASSWORD]#[HOST IP]/[SERVICE NAME]'
conn = cx_Oracle.connect(conn_str)
Result: DatabaseError: ORA-12170: TNS:Connect timeout occurred
import cx_Oracle
user= '[USERNAME]'
pwd = '[PASSWORD]'
host = '[HOST IP]'
service_name = '[SERVICE NAME]'
portno = '[PORT]'
conn = cx_Oracle.connect(user, pwd, '{}:{}/{}'.format(host,portno,service_name))
Result: DatabaseError: ORA-12170: TNS:Connect timeout occurred
import cx_Oracle
connstr = '[USERNAME]/[PASSWORD]#[SERVICE NAME]'
conn = cx_Oracle.connect(connstr)
Result: DatabaseError: ORA-12154: TNS:could not resolve the connect identifier specified
I have Toad installed on my PC and have no problems what so ever connecting to the DB with that.
Any ideas what could be the problem ?
Thanks in advance
I have this standard way to connect
import cx_Oracle
host="myserver"
port=myport
sid='myservicename'
user='myuser'
password='mypassword'
sid = cx_Oracle.makedsn(host, port, service_name=sid)
connection = cx_Oracle.connect(user, password, sid, encoding="UTF-8")
cursor = connection.cursor()
cursor.execute('select 1 from dual')
And it works without any issue. In your case, it is quite strange that you got a timeout, which normally indicates a network problem rather than a connection issue. If you are using cx_Oracle version 8, you don't need to specify the encoding as UTF-8 as it is the default one.
See how it works.
C:\python>type testconn.py
#from __future__ import print_function # needed for Python 2.7
import cx_Oracle
import os
host="myserver"
port=myport
sid='database_service_name'
user='myuser'
password='mypassword'
sid = cx_Oracle.makedsn(host, port, service_name=sid)
connection = cx_Oracle.connect(user, password, sid, encoding="UTF-8")
cursor = connection.cursor()
cursor.execute('select 1 from dual')
for row in cursor:
print(row)
C:\python>python testconn.py
(1,)
C:\python>
I am using mysql.connector to connect to a mysql DB, while i can connect manually to the db using sql server management, if i try connecting via code, it returns this error after awhile :
mysql.connector.errors.OperationalError: 2055: Lost connection to MySQL server at 'host:1234', system error: 10054 An existing connection was forcibly closed by the remote host
These are the connection details :
connection = mysql.connector.connect(host='host',
port = '1234',
database='DBname',
user='Usr',
password='pwd')
If I create a local mysql DB, the connection works just fine.
I assume some security stuff is going on, anyone else had encountered this situation ? Anything that I'm doing wrong? Should I add anything to the connection.connect input ?
Full code for reference :
import mysql.connector
from mysql.connector import Error
connection = mysql.connector.connect(host='host',
port = '1234',
database='DBname',
user='Usr',
password='pwd')
sql_select_Query = "select * from TableName"
cursor = connection.cursor()
cursor.execute(sql_select_Query)
records = cursor.fetchall()
print("Total numb of rows selected is : ", cursor.rowcount)
print("\nPrinting each row")
for row in records:
print(row)
connection.close()
Is there an equivalent way to connect to a postgres database in a similar way that sqlite connects to a database using python?
For example, in sqlite, a connection will be defined by conn = sqlite3.connect(curruser.dbname). What is the similar connection syntax for postgres?
You can use the psycopg connector then, and the connection syntax will be similar, except that you'll need to specify some more information in a connection string:
conn_string = "host='localhost' dbname='my_database' user='postgres' password='secret'"
conn = psycopg2.connect(conn_string)
Here are some examples: Using psycopg2 with PostgreSQL