Re: Explicit transactions

Hi,

Example:

try {
    DBTransaction trans = DODS.getDatabaseManager().createTransaction();//
createsne transaction
    xxxQuery query= new Query(trans); //creates new Query object inside
transaction
    xxxDO aDO = query.nextDO();

....
    xxxDO xdo = xxxDO.createExisting (oid, trans); //creates 'existing' Do
object inside transaction
    xdo.delete();
....
    xxxDO ydo = xxxDO.createVirgin (trans); // creates new DO object insite
transaction
    ydo.setYYY(aDO); //set reference - modify DO
    yDO.save(trans); //if AutoSave=true, it is done automatically

    trans.commit(); //commit all changes in transaction

  }catch(Exception ex) {
    trans.rollback(); // do rollback if something wrong
}

More information you can find in InsideDODS document (especially about new
parameters (AutoWrite, AutoSave...).

Regards,

Sinisa Milosevic,
Together Serbia


----- Original Message -----
From: "Axel Wilhelm Berle" <[email protected]>
To: <[email protected]>
Sent: Friday, December 19, 2003 1:52 PM
Subject: Enhydra: Explicit transactions


> Hi!
>
> I have been studying the DODS 5.1 faq (as well as
> Inside DODS and Using DODS) but found no example of
> how to execute multiple tasks in a single transaction.
>
> I would need to perform tasks in the form of:
>
> 1. Start transaction
> 2.    Read data
> 3.    Delete data
> 4.    Create data
> 5.    Modify data
> 6. Commit transaction
>
> Could someone send me some examples?
>
>
> Thanks in advance!
>
>     Axel
>
>
>
>
>
> =====
> Axel Wilhelm Berle
>
> e-mail: [email protected]
> Tel: (office) +55 16 618.0090
>      (mobile) +55 16 9964.6343
>
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