Re: what happens if a failed transaction is not rolled back?

On 4/24/23 08:37, Siddharth Jain wrote:
> Hi All,
>
> i understand when writing application code, we should rollback a
> transaction that fails to commit. this is typically done in the catch
> block of a try-catch exception handler. but what if the developer does
> not rollback the transaction? what happens in that case?
>
> note that i am not asking: what happens if a transaction is not rolled back?
> i am asking: what happens if a /failed/ transaction is not rolled back?
>
> failed transaction = you try to commit it but get an exception back from
> the database.

In Python:

import psycopg2
con = psycopg2.connect("dbname=test host=localhost user=postgres")
cur = con.cursor()
cur.execute("select 1/0")
DivisionByZero: division by zero

cur.execute("select 1")
InFailedSqlTransaction: current transaction is aborted, commands ignored
until end of transaction block

>
> thanks.
>
> S.

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com