use a savepoint:
from sqlalchemy import exc
try:
with session.begin_nested():
session.add(MyObject())
session.flush()
except exc.IntegrityError:
pass
session.commit()
personally I prefer just to emit a SELECT first, which may be a per-row SELECT
or may be a prefetch of all the rows from the table in question.
On Jul 23, 2014, at 2:15 PM, Milind Vaidya <kava...@gmail.com> wrote:
> I have a script which updates DB periodically. There are some base table
> which may undergo some change but very rarely. In such case if this script
> tries to insert the already present value it will throw integrity error.
> Is there any way of dealing with this other that first fetch the value
> manually and then only insert if not present ?
>
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