Develop Reference

Does pyodbc execute commands like "select columnA*2 where columnB!=0 from tableA into tableB" locally or remotely?

I am using pyodbc for generating new tables in a remote SQL server. I wrote the following code, replacing column names, table names, driver name, and server name with dummy names.
import pyodbc
query="select columnA*2 where columnB!=0 from tableA into tableB"
connection = pyodbc.connect('Driver={driverA};''Server=serverA;'
'Trusted_Connection=yes;')
cursor = connection.cursor()
cursor.execute(query)
connection.commit()
cursor.close()
connection.close()
I wonder when I run this this code in my Jupyter notebook (I am not sure if running it in a Jupyter Notebook is relevant, but I figure it doesn't hurt to mention it), does my laptop execute some parts of the code or does my laptop send all these code to serverA and ask serverA to execute the command?
What about the following code? Does my laptop simply send the code to the server and wait for the response? Alternatively, does my laptop asks for the entire tableA and then do some of the computing locally?
cnxn = pyodbc.connect("Driver= {driverA};" "Server=serverA;" "Database=databaseA;"
"Trusted_Connection=yes;")
diagramFinal = pd.read_sql("""select columnA*2 where columnB!=0 from tableA""", cnxn)
cnxn.close()
I read through this documentation without finding relevant information. So, I wonder if someone could help me with figuring it out.

Connecting to an Azure database with a hyphen in its name

I have an azure sql server instance containing a database which has a hyphen in its name like "database-name".
I am trying to connect via a python script and having some issues with it.
In the script when I use the connection string like this:
"Driver={ODBC Driver 18 for SQL Server};Server=serveraddress;Database=database-name;UID=username;PWD=password;"
I get the following error:
Incorrect syntax near 'name'.
I figured this may be caused by the hyphen and changed the connection string to this instead:
"Driver={ODBC Driver 18 for SQL Server};Server=serveraddress;Database=[database-name];UID=username;PWD=password;"
But I get an error like this:
Cannot open database "[database-name]" requested by the login. The login failed.
however I am able to login with the same user from SSMS.
Can this be permission related issue?

I tried to reproduce your scenario on my end and got results like the below:-
I created one Azure SQL server and database both with hyphen in their names like below:-
Make sure you add your client IP access to your Azure SQL database like below:-
I populated Azure SQL Database with one table and its entities.
Tried the below code to connect Azure SQL DB with python, Make sure your connection string format is correct as per the code below:-
You can validate the connection string from your Azure Portal like below:-
Code:-
import pyodbc
conn = pyodbc.connect('Driver={ODBC Driver 17 for SQL Server};'
'Server=tcp:valley-server.database.windows.net,1433;'
'Database=valley-db;'
'Uid=siliconserver;'
'Pwd=xxxxxx#123')
cursor = conn.cursor()
cursor.execute('SELECT * FROM StudentReviews')
for i in cursor:
print(i)
cursor.close()
conn.close()
SQL command executed successfully by connecting to Azure-SQL DB. Make sure the ODBC package is installed in your machine from where you’re executing the code. And the server or Database name has correct spelling or syntax.

python to oracle db connection making delay

I'm using following code to connect to a remote oracle DB server, But it takes more than 10 second only to create the DB connectivity, then the DB SQL query return result instantly. Same connection made by the nodejs and it works perfectly. checked the connectivity between the source and destination, but cannot see any issue. Can you help me to diagnose this issue. I'm using;
python 3.6 and use oracle instant client libraries( basic) to connect
import cx_Oracle
dsn_tns=cx_Oracle.makedsn('dbhost','port',service_name='SERVICENAME')
conn = cx_oracle.connect(user=r'USER_NAME',password='******',dsn=dsn_tns)
c = conn.cursor()
c.execute("""SIMPLE SELECT QUERY""")
for row in c;
print (row[0],'-',row[1])
conn.close

Sometimes it may happen because of slow random number generation.
Take a look here https://learn.capstorm.com/copystorm/frequently-asked-questions/problems-solutions/how-do-i-fix-random-oracle-login-connection-timeouts/
Or here https://support.oracle.com/epmos/faces/DocContentDisplay?id=1594701.1

How to set mysql rows to variable in Python

I am new to programming and working on a self-motivated password analyzer project. Part of my program searches User's password through the common password list. Originally I had this folder as .txt file however I wanted to put the list in mySQL server. I was able to connect to my server and create a table with 3 rows that had passwords. However I can't figure out how to tell python to search through the sql server and the rows.
Thank you for the help!

So, since you're trying to fetch some data from MySQL, you need to initiate the connection with the MySQL server in the first place. Then you can perform your queries on the DB through Python.
To initiate connection
pip install mysql-connector-python. See Install MySQL Connector
Then you can import the connector in your script import mysql.connector.
Example
Updated as per the comments discussion.
from mysql.connector import (connection)
cnx = connection.MySQLConnection(user='scott', password='password',
host='127.0.0.1', # Or 'localhost'
database='employees')
sql_select_query = "select * from passw"
cursor = cnx.cursor()
cursor.execute(sql_select_query)
records = cursor.fetchall()
for record in records:
password = record[0]
cnx.close()
Note: Consider using environment variables to securely use sensitive data (MySQL connection data).
More details with examples can be found in Connecting to MySQL Using Connector/Python.

Cannot connect to database - python ODBC

I am struggling to connect to an ODBC DSN using python 3. The ODBC driver is a read only driver from a SCADA package vendor not a standard MS or Oracle driver type.
I have tried pyodbc:
import pyodbc
...
connectionString = 'dsn=myDSN'
connection = pyodbc.connect(connectionString)
Which yields the error:
('HY000', '[HY000] [Simba][ODBC] Not enough information provided to connection to data source and specified to not prompt for more information. (10042) (SQLDriverConnect); [HY000] [Simba][ODBC] Not enough information provided to connection to data source and specified to not prompt for more information. (10042)')
I have tried odbc:
import odbc
...
conn = odbc.odbc('myDSN')
Which yields the similar error:
[Simba][ODBC] Not enough information provided to connection to data source and specified to not prompt for more information. in LOGIN
I have third party .net forms program which I decompliled and I can see uses a standard System.Data.Odbc.OdbcConnection with the same simple connection string as the pyodbc method above and it works fine...
I have been over the pyodbc documentation but I can't see any other parameters or attributes I need to set to get this to work, or at least have it prompt for the extra information I am not supplying.
Has anyone encountered this before?
Thanks in advance.
Mike.

Try do to like this:
sql_conn = pyodbc.connect(r'DRIVER={SQL Server};SERVER=10.10.10.10;DATABASE=test; trusted_connection=yes')