Connect to Oracle database using pyodbc

Question

I would like to connect to an Oracle database with python through pyodbc. I have installed oracle driver and I tried the following script:

import pyodbc
connectString = """
                DRIVER={Oracle in OraClient12Home1};
                SERVER=some_oracle_db.com:1521;
                SID=oracle_test;
                UID=user_name;
                PWD=user_pass
                """
cnxn = pyodbc.connect(connectString)

I got the following error message:

cnxn = pyodbc.connect(connectString)

Error: ('HY000', '[HY000] [Oracle][ODBC][Ora]ORA-12560: TNS:protocol adapter error\n (12560) (SQLDriverConnect)')

What's wrong here?

Answer 1

Why keyword DBQ works and SID / Service Name does not, see the section 21.4.1 Format of the Connection String in Oracle 12c documentation. https://docs.oracle.com/database/121/ADFNS/adfns_odbc.htm#ADFNS1183/

or google keywords for odbc oracle 12c

Answer 2

Looks Like your missing a PORT

Try this way

NOTE: Depending on your Server the syntax can be different this will work for Windows without DSN using an SQL Server Driver.

connectString = pyodbc.connect('DRIVER={SQL Server};SERVER=localhost;PORT=1433;DATABASE=testdb;UID=me;PWD=pass')

This is the connection, you still need a cursor and to use execute along with an SQL Statement..

Answer 3

您必须在数据库服务器正在运行的连接字符串中指定服务器或主机名（或 IP 地址）。

Answer 4

So close...

connectString = """
        DRIVER={Oracle in OraClient12Home1};
        SERVER=some_oracle_db.com:1521;
        DBQ=oracle_test;
        Uid=user_name;
        Pwd=user_name
        """

I replaced SID with DBQ