I'm using sqlalchemy with sql server express. Client-side
is also Windows, running python 2.5.2.
I find that all my changes get rolled back when using
0.5.2. But using 0.4.8, things work as I expect.
Here is an example script:
--- start script ---
import datetime
import sqlalchemy
from sqlalchemy.orm import scoped_session, sessionmaker
print "sqlalchemy version:", sqlalchemy.__version__
conn_str = 'mssql://<user>:<password>@<server>/<database>?dsn=<dsn>'
mssql_engine = sqlalchemy.create_engine(conn_str)
mssql_metadata = sqlalchemy.MetaData(bind=mssql_engine)
MSSQLSession = scoped_session(sessionmaker(bind=mssql_metadata.bind))
data = 'bingo'
now = datetime.datetime.now()
time = now.strftime('%Y-%m-%d %H:%M:%S')
command = "INSERT sa_test (data, time) VALUES ('%s', '%s')" % (data,
time)
session = MSSQLSession()
session.execute(command)
session.commit()
command = "SELECT COUNT(*) FROM sa_test WHERE data='%s'" % data
session = MSSQLSession()
print "count:", session.execute(command).scalar()
MSSQLSession.remove()
--- end script ---
Running this I'll get "count: 1" (assuming a clean sa_test table),
showing
that the insert occurred. But then looking in the database, I'll see
that
the data aren't there (with 0.5.2; with 0.4.8 the data will be there).
The same thing happens with updates.
It appears to me that the session.commit() call isn't working
with 0.5.2. I think the transaction is staying open until the call
to MSSQLSession.remove(), which rolls everything back.
Some evidence of that ... If I add the line
raw_input("Enter to exit.")
before the MSSQLSession.remove(), and then while paused there
I go to a query window in sql server express, if I'm using 0.5.2 I'll
find that queries against the table hang -- presumably waiting for
the transaction to finish. But with 0.4.8 this has no effect -- the
changes have already been committed.
Thanks for any help resolving this.
David
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