Re: Distinguish committed data from other transactions and uncommitted data from my transaction in a database table.

> "Manfred Bauer" <manfred.bauer4711_at_gmx.de>
> Hello,
>
> I have the following problem:
> I have an interace table ordedata with a a sequence number to
> determine
> the sequence of the data.
> The table looks like this:
> ordecode
> orderow,
> ..
> seqnbr (sequence number )
>
> I have now a transaction, which writes one or several rows into
> that table.
> What I want is the following:
> At the beginning of the transaction I am selecting the highest
> sequence
> number for the data for a specific order and store it in a global
> PL/SQL-Variable.
> At the end of the transaction, I want to get again the highest
> sequence
> number in the table for my order.
> Now I want to find out in my transaction, if some other transaction
> have written also data in that table.
> My Problem:
> How can I distinguish in my transaction, if the data comes from my
> transaction
> and is not yet committed or if the data comes from a different
> transaction
> and is alredy committed. My transaction sees always all data
> regardless if it they are mine or not.
> I was trying to do it with autonomous transactions, but it seems not
> to work.
> I don't want to rely on some data, like a columns, where it is stored,
> who writes the data.
> Is there a possibility to do this ????

You would need additional column into this table to identify your transaction.
 Lets say 'transaction_id'.
 Then you need a sequence to get your transaction_id at the beggining.  At the end of transaction all rows with your transaction_id will be yours uncomitted.
 All rows with transaction_id higher than your transaction_id will be others, commited.

--
Noel