I have been recently playing with context managers and the new "with"
statement added in Python 2.5. I would like to suggest the addition of
the following methods to connections:
def __enter__(self):
return self
def __exit__(self, excType, excValue, excTraceback):
if excType is None and excValue is None and excTraceback is None:
self.commit()
else:
self.rollback()
This allows the following code:
from __future__ import with_statement
connection = .....
with connection:
cursor = connection.cursor()
cursor.execute("update SomeTable set SomeColumn = "SomeValue")
cursor.execute("delete from SomeOtherTable where SomeOtherColumn = 5)
rather than
try:
cursor = connection.cursor()
cursor.execute("update SomeTable set SomeColumn = "SomeValue")
cursor.execute("delete from SomeOtherTable where SomeOtherColumn = 5)
connection.commit()
except:
connection.rollback()
I've implemented this in cx_Oracle and it appears to work quite
nicely. Thoughts?
Anthony
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