and may make all flushes persistent. The other storage engine widely used is
InnoDB which does support transactions. Find out in the MySQL docs how to
figure out which storage engine you're using.
Sent from my fantastic HTC Hero
On Nov 28, 2009 7:27 AM, gizli mehm...@gmail.com wrote:
I am
gizli mehm...@gmail.com:
With mysql however, the insert done by the query() actually does a
commit.. i turned on echo, and i dont see an explicit commit but this
is what seems to happen.. After the program is done, I can see Obj(5)
in the mysql database.
Is this a known problem? Or am I
Hi guys,
I have a couple of questions about a recent concurrency test I did on
SA. Someone in our team ran into a very intermittent issue where a
certain operation he tried doing failed by ConcurrentUpdateError. I
wrote a simple thread that can do query/update/insert/commit/rollback
operations
provided a way to turn the
feature off. Thanks a lot.
On Sep 17, 3:59 pm, Michael Bayer mike...@zzzcomputing.com wrote:
gizli wrote:
t1.delete(obj)
t2.delete(obj)
t2.commit()
t1.commit()
I also forgot to mention that you can always use query.delete() or
table.delete() to get a standard
Hi all,
I am just starting to think about this topic so please dont shoot me
if I missed the obvious :).
There are many varieties of database errors. So, sometimes in our
code, we need to let these errors be returned to the user. E.g. we
would like a french guy using this application to have a
decorators.. write a function similar to the
polymorphicsetter class above and return the modified cls object..
then for every subclass of Task, use the decorator..
The advantage of the first approach is that, there is no need to do
anything once the Task class is extended..
On Sep 9, 7:51 pm, gizli
Hi all,
This list has been very helpful so far, thanks a lot. I was just
wondering if there is a transparent way to assign polymorphic
identities to ORM classes using single table inheritance. Let's say we
have a base Task class:
class Task(DeclarativeBase):
__tablename__ = 'Tasks'
id =
Thanks for the suggestion Wolodja but I dont think that would work.
The self object is not defined at the time of class loading in python:
class Test:
... qq = self.__class__.__name__
... def fu(self):
... print fu
...
Traceback (most recent call last):
File stdin, line 1,
Hi all,
I just discovered something weird when doing concurrency testing with
my program. Before writing a simplified test case for it and really
figuring out whether its a bug with sqlalchemy (I am using 0.5.5), I
wanted to write the scenario here. Basically I was getting the
infamous Set size
Hi all,
I have a pretty basic question about autoflush that I could not find
an answer to. By default, in sessionmaker, this is set to true.
However, I have this basic scenario where my transaction involves
inserting objects into session and querying for some others:
add(o1)
query(SomeObject)
Okay. I believe this is my mistake. I just wrote a simple test program
and saw that the other threads should not see o1 or o2 until commit
since I am using scoped_session. I guess there is another reason for
the behavior I am seeing.
On Aug 28, 10:05 pm, gizli mehm...@gmail.com wrote:
Hi all
Hi all,
This is not really a sqlalchemy question but I was wondering if anyone
developing with sqlalchemy knows the answer.
Turning on echo=True spits out all the queries that the application
generates. Currently I am directing this output to a file and then
looking through to derive statistics
Never mind. Using primaryjoin and secondaryjoin helped quite a bit :)
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Hi all,
Please help me model this scenario with many-to-many relations:
I am trying to model a directed graph. My objects are nodes: n1...nk,
and I have a bunch of directed edges: n1 -- n3, n5 -- n6, n6 -- n2
and so on. From reading the documentation, I know that the nodes will
probably be one
Thanks a lot Michael.
The merge functionality is what I was looking for. This also exposed a
flaw in our model I think. We keep using the auto-increment primary
keys which would make merge() impossible to use in the scenario I was
describing. Right?
The easiest way to do auto insert or
Hi all,
Forgive me if this is a very basic question but I could not find the
answer anywhere.
I am trying to write a data population script to setup a few tables
and insert some data in them. I need to make this script reentrant..
The problem is that currently the script looks like this:
get a
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