Hi Tino,
good question . . .
One would like to be able to override the createQueryString method of the
XxxPeer class, but - alas! - it is a static method :-(
The only solution I see is implement some additional methods in your
XxxPeer class that do everything that's already in the BaseXxxPeer class,
but with the modified select statement (please note that I have appended
"ForUpdateNowait" to the method names):
public static Xxx retrieveByPKForUpdateNowait(ObjectKey pk, Connection
con)
throws TorqueException, NoRowsException, TooManyRowsException
{
Criteria criteria = buildCriteria(pk);
List v = doSelectForUpdateNowait(criteria, con);
if (v.size() == 0)
{
throw new NoRowsException("Failed to select a row.");
}
else if (v.size() > 1)
{
throw new TooManyRowsException("Failed to select only one
row.");
}
else
{
return (Xxx)v.get(0);
}
}
public static List doSelectForUpdateNowait(Criteria criteria,
Connection con)
throws TorqueException
{
return
populateObjects(doSelectForUpdateNowaitVillageRecords(criteria, con));
}
public static List doSelectForUpdateNowaitVillageRecords(Criteria
criteria, Connection con)
throws TorqueException
{
if (criteria.getSelectColumns().size() == 0)
{
addSelectColumns(criteria);
}
// Set the correct dbName if it has not been overridden
// criteria.getDbName will return the same object if not set to
// another value so == check is okay and faster
if (criteria.getDbName() == Torque.getDefaultDB())
{
criteria.setDbName(DATABASE_NAME);
}
// BasePeer returns a List of Value (Village) arrays. The array
// order follows the order columns were placed in the Select
clause.
// if (con == null)
// {
// return BasePeer.doSelect(criteria);
// }
// else
// {
// return BasePeer.doSelect(criteria, con);
// }
return BasePeer.executeQuery(
createQueryString(criteria) + " FOR UPDATE NOWAIT",
criteria.getOffset(),
criteria.getLimit(),
criteria.isSingleRecord(),
con);
}
Please note that this code presumes you have a non-null Connection con when
invoking retrieveByPKForUpdateNowait.
I have not tested if this code actually works, but perhaps you've got the
time to do this and report your experience back...
Gruss
Arne
"Sperlich, Tino" wrote:
Hi Arne,
thanks for your replies.
The nowait option really
seems to be doing what is required:
return if the row is blocked by
smbd. else.
excuse me if I keep asking, but
how would I code that with Torque?
Do I have to create a custom query
or even raw sql? that would be the
very last choice since then
I would loose torque mapping db-stuff
to my objects...
I saw that in Hibernate the criteria object
has the setQueryTimeout option, and
I have also looked at the torque source
and it seems to me that adding that to
torque/village is quite an effort...
Gruesse,
Tino
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