SQL Update fails - pyodbc - informix

Updates to an 开发者_Python百科informix database via a python script using pyodbc are silently failing.

I am using the syntax as provided in the pyodbc wiki and tried manual commit as well as autocommit

   cursor= conn.cursor()
   cursor.execute("update eqpt set notes='BOB' where serialno='SAM'") 
   conn.commit()
   conn.close() 

I posted this question in the pyodbc group as well but unfortunately did not get an answer.

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Two ideas:

1. Check how many records was changed (it is retured by execute()), and how many records should be changed (using SELECT count(*) ... WHERE...:

   cursor= conn.cursor()
   
   rs = c.execute("SELECT count(*) FROM eqpt WHERE serialno='SAM'")
   for txt in c.fetchall():
       print('before %s' % (txt[0]))
   
   rows_affected = cursor.execute("update eqpt set notes='BOB' where serialno='SAM'") 
   print('rows_affected: %d' % (rows_affected))
   
   rs = c.execute("SELECT count(*) FROM eqpt WHERE serialno='SAM'")
   for txt in c.fetchall():
       print('after %s' % (txt[0]))
   
   conn.commit()
   conn.close() 
   

2. You can enable ODBC tracing and check what is returned by ODBC driver.