I am trying to connect to MYSQl db Server using pyodbc module.
with pyodbc.connect('DRIVER={MySQL ODBC 5.6 Driver};SERVER=XX.XX.X.XX;PORT=3306;DATABASE=ssc;UID=Pra;PASSWORD=welcome;') as cnxn:
cursor = cnxn.cursor()
cursor.execute('insert into ....')
When I ran the above code in python I am encountering an error 'local variable 'cnxn' referenced before assignment'I am working on MySQL workbench 6.2 and I am not sure which version of MySQL driver to use.
This specific error isn't a problem with the driver, the cnxn object is never created.
Change your code to:
cnxn = pyodbc.connect('DRIVER={MySQL ODBC 5.6 Driver};SERVER=XX.XX.X.XX;PORT=3306;DATABASE=ssc;UID=Pra;PASSWORD=welcome;')
cursor = cnxn.cursor()
cursor.execute('insert into ....')
The pyodbc wiki has a getting started section that is helpful.
For further reading, see pyodbc issue 100 concerning use of with.
Why don't you try using the MySQL driver for Python?
pip install MySQL-python
Related
beginner python programmer here,
I'm having an issue with pyodbc. I've included two images. The first is the code itself... and here it is again in text:
def retrieve_db(self):
conn = pyodbc.connect('DRIVER={SQL Server};SERVER=localhost;DATABASE=Students;Trusted_Connection=yes;')
cursor = conn.cursor()
cursor.execute("SELECT * FROM tbl_student")
for row in cursor:
print(row)
The issue is that I have an .mdf that I'm trying to connect to but when I execute the program to retrieve all records it does not connect. Really not sure what the issue is. Reading other posts across the web I believe it's something to do with the connection string itself but I can't figure out how to syntax the correct param. The pyodbc connector was installed correctly as far as I'm aware.
Can anyone help? In particular does anyone know how to create and connect to an.mdf using Visual Studio and the python pyodbc? Also, when I attempt to connect to a local DB created in MySQL workbench, I get the same issue. Any suggestions?
code in editor
the .mdf using the built in sql server on Visual Studio
the error i get
conn = pyodbc.connect('DRIVER={SQL Server};SERVER=localhost;DATABASE=Students;Trusted_Connection=yes;')
According to your code you're trying to use "SQL Server" driver. Is ODBC Driver for SQL Server properly installed on your system?
If not, please, download it from Microsoft website and install.
https://learn.microsoft.com/en-us/sql/connect/odbc/download-odbc-driver-for-sql-server?view=sql-server-ver15
I'm setting up a python script to connect to an instance of the azure cloud database, and seeing a difference in the connection when I use IDLE vs when I try to execute the connection from a script. For example, when I do the following in IDLE:
>>> import pyodbc
>>> conn = pyodbc.connect('DRIVER={SQL Server};SERVER=<my.database.host.info>,1433', user='<my_username#mydatabase', password='password', database='database')
I'm able connect successfully and execute a basic query against one of the tables in the database.
However when I use the same connection string (copied from the IDLE console) in a script, I get the following error:
pyodbc.Error: ('IM002', '[IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified (0) (SQLDriverConnect)')
Usually, the issue is raised because the 32/64 bit version of python environment and odbc driver are mismatched.
You may check the python version and odbc driver version you used to run the script. You have to manage to change both of them need to be 32-bit (or both 64-bit) in order for this to work.
You can get the specified version of pyodbc extension from http://www.lfd.uci.edu/~gohlke/pythonlibs/#pyodbc.
I'm trying to use Python on a RedHat machine to connect to a SQL Server database using the Microsoft provided driver. I know the driver is working because I can connect using the sqlcmd. The following in Python yields an error. It seems that pyodbc can't find the driver. Anybody know how to fix this?
conStr = 'Driver={SQL Server Native Client 11.0};Server='+server+';Database='+db+';
UID='+u+';PWD='+pw+';'
cnxn = pyodbc.connect(conStr)
pyodbc.Error: ('IM002', '[IM002] [unixODBC][Driver Manager]Data source name not found, and no default driver specified (0) (SQLDriverConnect)')
I found that on Linux I needed to remove the braces around the driver name.
Some more info on the Driver keyword can be gleaned from here:
http://msdn.microsoft.com/en-us/library/hh568455
Actually, You can use pymssql to connect SQLServer in python.
It's easy to use, similar with MySQL-python lib.
http://code.google.com/p/pymssql/
Since pyodbc is going through unixODBC, can you confirm odbc.ini and odbcinst.ini are correctly set up?
I am running an Ubuntu Server. I would like for it to have a Python (v3.2) CGI script that would connect, and run a query, to the local MySQL database I have set up. Currently, the only things I found don't support Python 3.2. Please do not suggest switching to an earlier version of Python, because that is not an option for me.
pymysql - Pure Python MySQL client is very good.
It works with Python 3.x, and doesn't have any dependencies.
This pure Python MySQL client provides a DB-API to a MySQL database by talking directly to the server via the binary client/server protocol.
Example:
import pymysql
conn = pymysql.connect(host='127.0.0.1', unix_socket='/tmp/mysql.sock', user='root', passwd=None, db='mysql')
cur = conn.cursor()
cur.execute("SELECT Host,User FROM user")
for r in cur:
print(r)
cur.close()
conn.close()
sqlalchemy supports MySQL and all versions of Python 3. It's nice because you don't have to write SQL; it makes tables look like classes and records look like objects.
BlaXpirit's answer above to use pymysql works great! But one small caveat. The link to pymysql in his comment will take you to https://github.com/petehunt/PyMySQL/ which is for python 2.x. If you are using python 3, you want to download and install pymysql3 (version 3.0.5 as of 5/12/12) from http://pypi.python.org/pypi/PyMySQL3/
I want to connect Python to DB2 version 9.1 using IBM DB2 ODBC Driver.
Following is my code to connect Python to DB2. This program is working in the later versions of IBM DB2.
import ibm_db
conn = ibm_db.connect("DSN=PDB2;DRIVER={IBM DB2 ODBC DRIVER};DATABASE=MDBASIS;PORT=1234;PROTOCOL=TCPIP;UID=username;PWD=password","","")
stmt = ibm_db.exe_immediate(conn,"create table egg (ID SMALLINT, NAME VARCHAR(30))")
stmt = ibm_db.exe_immediate(conn,"insert into egg (ID, NAME) VALUES('1','ok')")
state = ibm_db.exe_immediate("select * from egg")
result = ibm_db.fetch_both(state)
while result != False:
print 'id = %d and name = %s' %(result[0],result[1])
result = ibm_db.fetch_both(state)
stmt = ibm_db.exe_immediate(conn,"drop table egg")
My problem is, the version of my IBM DB2 is 9.1 without FixPack and I get an error message when I try to connect to IBM DB2 9.1 version.
"[IBM][CLI Driver] CLI0133E Option type out of range. SQLSTATE=HY092 SQLCODE=-99999"
And the explanation for this error written in page http://programmingzen.com/2008/02/08/essential-guide-to-the-ruby-driver-for-db2/is:
"If you get this error, it usually means that you are using a version of DB2 that is too old. Install the latest FixPack or the latest version of DB2 (currently 9.5) to resolve the problem."
But I cannot install latest FixPack or the latest version of DB2 or in any way modify existing DB2 installation.
Question
Is there any way I can connect to DB2 version 9.1 without modifying the database, possibly using something else than IBM_DB?
I think the problem is in the client ibm_db driver. Basically you can connect to any older version from all the languages. Try to get another db2 driver. If I were you I would install the db2 client which comes with several drivers which are located in sqllib.
What version of ibm_db are you using? I am able to connect to DB2 9.1 with ibm_db 1.0.4 without problems.
Also: Based on the fact that you're specifying DSN in your connection string, I assume that you already have the database cataloged on the client as PDB2. You can greatly simply your connect statement to:
conn = ibm_db.connect('PDB2','username','password')
The only time you need to use the longer form (where you specify DATABASE/PORT/HOST/UID/PWD) is if you are using a DSN-less connection (i.e. the database has not been cataloged on the local machine).
I guess your DB2 client API version is higher than the DB2 server itself, ensure you use the same version on the client machine, try to connect and maintain your database remotely using the DB2 control center, and try to connect from python with:
conn = ibm_db.connect("MDBASIS", "username", "password")
AFAIK, this would force the wrapper to use native library instead of odbc.
ibm_db (and PyDB2 are just python modules that allow you to access the DB2 API calls through python. The DB2 queries themselves are being performed by your DB2 installation... something very separate from ibm_db and PyDB2.
It sounds like your DB2 installation is the problem, not ibm_db. You can test this by running db2 from the command line and seeing if you can execute your query directly in the db2 command line interface.