Python with pyodbc and SQL Server

I am building a query batch of multiple queries to be executed from python in sql server like:

update tbl1 set... where...
insert tbl2 values...
update tbl3 set... where...

If the insert causes a PK violation the execution of the batch does not report anything. It is like the execution is successful. However the same query executed directly in SQL server will fail.

How can I catch the error?
LVL 27
ZberteocAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

mankowitzCommented:
You will have to catch errors individually, using exceptions. For example

conn = pyodbc.connect( 'dsn=MyDSN')
cur = conn.cursor()
try:
     cur.execute ( 'SELECT * FROM table')
except pyodbc.Error:
     print 'caught an error... continue?'

Open in new window

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
ZberteocAuthor Commented:
I need to rectify my question a bit. My problem isn't that the error is not caught but the error message which is not explicit, doesn't really say what happened:

      ErrNo:      HY007
      ErrMsg:      [HY007] [Microsoft][ODBC SQL Server Driver]Associated statement is not prepared (0) (SQLNumResultCols)


I also tied to wrap the SQL query batch in TRY ... CATCH and if there is error (and there is PK violation) I use RAISERROR SQL statement to bring it back in Python.

However in this case the RAISERROR is completely ignored by Python and it won't report error unless the first command in the query batch produces it!

I want to catch the real error message, even if produced in the middle of the batch and bring it back to python to log it.
ZberteocAuthor Commented:
I am not sure what happened but now I get the error after a combination of try..catch in python with try..catch with raiserror in SQL that I execute. Anyway I consider the question answered.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Programming Languages-Other

From novice to tech pro — start learning today.