Ute,
Both of these are most likely modeling errors. See below...
On Sep 19, 2007, at 3:48 AM, Ute Hoffmann wrote:
Hallo,
I have a app, where I need to delete some data before reading more
data in via an import mechanism.
But my seemingly simple deletes throws weird errors - perhaps
someone knows what is going on here.
Delete jointable from many to many (Objects where the joins point
to are to stay intact):
Exception:
com.webobjects.eoaccess.EOGeneralAdaptorException:
deleteRowDescribedByQualifierEntity --
com.webobjects.jdbcadaptor.JDBCChannel: method deleted 4 rows, it
is only permitted to update 1 row
at
com.webobjects.eoaccess.EODatabaseContext._exceptionWithDatabaseContex
tInformationAdded(EODatabaseContext.java:4686)
Code:
NSArray produktverknuepfungen1 = EOUtilities.objectsForEntityNamed
(ec, "Jgruppeprodukt");
if(produktverknuepfungen1.count()!=0){
for(int m=0; m<produktverknuepfungen1.count(); m++){
Jgruppeprodukt aPZWert = new Jgruppeprodukt();
aPZWert = (Jgruppeprodukt)produktverknuepfungen1.objectAtIndex(m);
ec.deleteObject(aPZWert);
ec.saveChanges();
}
}
Any idea what goes wrong here???
This only occurs when you have duplicate primary keys in your
database. Are you using any inheritance here? Is anything outside
of EOF modifying the database table? If you could provide the
details of the entity, it would be helpful, but the first thing I
would do is something like:
select count(*) from table
select count(distinct primary_key) from table
These numbers should always be equal - my guess is that in your case,
they're not. You should also verify that the little key symbols in
your EO properly reflect what you think the primary key is.
Second case (even more inexplainable to me):
A one- to many. I try to delete the to-many part, I do exactly the
same with same code before I do this and it works. With this
relationship however I get an Exception that the "pzusatzgruppes"
in produkt (Produkt <->>Pzusatzgruppe) is not an array. I checked
and checked and IT SEEMS TO BE AN Array. Nothing I can see
differentiates the relationship and the java-classes belonging to
it from the relationship which works :-(
Im at a loss. Some ideas?
Again, almost certainly a modeling error. Make sure the to-many
relationship is modeled properly. Also, make sure that you're not
overriding any of the awake methods (awakeFromInsertion(EC)) without
calling super().
Can it be that mysql 5 has problems with my JDBC-Driver? Which one
should be used with mysql 5? I need one which is able to handle
international characters ISO-Latin something. This could explain
Exception 1 but not Exception 2??
Possibly. Are your primary keys strings? With EOF, it's highly
recommended that you use non-user controlled integer primary keys.
Thank you for your help,
Regards
Ute
PS. Running WO 5.2.4 on Mac OS X 10.4.10 with Xcode 2.0 -> could
that combination make for the problems?
Doubtful...I've used EOF since the early days, and these problems are
almost always model based.
Good luck!
Ken
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