我正在尝试使用 sqlalchemy 连接到我机器上的 SQL Express 服务器，但出现错误

Question

I'm trying to connect to a SQL Express Server on my machine using sqlalchemy but I'm getting an error. Here is the code I have:

import sqlalchemy as sal
import pandas as pd

sqlcon=sal.create_engine('mssql+pyodbc://@' + 'DESKTOP-A1BUCDR\SQLEXPRESS' + '/' + 'Northwind' + '?driver=ODBC+Driver+13+for+SQL+Server')

df = pd.read_sql_query('select * from Orders', sqlcon)

And here is the error I'm getting:

InterfaceError: (pyodbc.InterfaceError) ('IM002', '[IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified (0) (SQLDriverConnect)')
(Background on this error at: https://sqlalche.me/e/14/rvf5)

Does anyone have any ideas on what I may be getting wrong here?

Answer 1

Your URL evaluates to:

mssql+pyodbc://@DESKTOP-A1BUCDR\\SQLEXPRESS/Northwind?driver=ODBC+Driver+13
+for+SQL+Server

The errors points to not finding the data source name (DSN), which I think you must not want to use since you give what looks like a hostname and a driver parameter.

That's fine too:

mssql+pyodbc://<UID>:<PWD>@DESKTOP-A1BUCDR:1433/Northwind?driver=ODBC+Driver+17+for+SQL+Server

If your port is the default (1433), you don't really need to add it.

Why is your hostname DESKTOP-A1BUCDR\SQLEXPRESS ? and why are you using ODBC Driver 13 for SQL Server and not a more recent version ?

You could instead try using a URL built for your hostname or directly the pyODBC string .

Answer 2

The format to connect to a SQL Server Express using Windows Authentication is:

import sqlalchemy

sqlcon = sqlalchemy.create_engine('mssql://DESKTOP-A1BUCDR\SQLEXPRESS/AdventureWorks?driver=ODBC+Driver+17+for+SQL+Server') 

DESKTOP-A1BUCDR\SQLEXPRESS is the servername