On Fri, Nov 18, 2016 at 11:43 AM, Santosh Sharma
<chitr.praya...@gmail.com> wrote:
> I am using SQLAlchemy and postgres database.
>
> I want to do "Delete and Insert operation" on the table in a single
> transaction without using orm.
>
> Say
> table User
> Column | Type | Modifiers
> --------+-------------------+---------------------------------------------------
> id | integer | not null default
> nextval('test_id_seq'::regclass)
> name | character varying |
>
>
> All users from table are retrieved and displayed at small time
> interval.(2 secs)
>
>
> say u1,u2,u3 are current users in DB.
>
>
> Updated user list is u3,u4,u5.
>
> Now i have to delete [u1,u2 ] & add [u4,u5]. This deletion and addition of
> users should be in single transaction so that
> users retrieved/displayed from table are either [u1,u2,u3] or [u3,u4,u5] .
> And to avoid retrieval of transitional list of users say [ u1 ] (after
> deletion).
>
> In the similar steps it is required to do bulk deletion and bulk addition in
> a single transaction.
>
This section of the docs deals with transactions in SQLAlchemy Core:
http://docs.sqlalchemy.org/en/latest/core/connections.html#using-transactions
You can execute as many statements as you like between starting and
committing the transaction.
Hope that helps,
Simon
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