On 4/24/23 08:43, Adrian Klaver wrote:
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
Forgot to add.
To get past above:
con.rollback()
cur.execute("select 1")
thanks.
S.
--
Adrian Klaver
adrian.kla...@aklaver.com
