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merge problem [message #1064554]

Wed, 19 June 2013 21:02

kamal na

Messages: 3
Registered: June 2013

Junior Member

I have a problem with the entitymanager
times and need your help.
I just want to save time and merge two tables each time
the tables have 1to n relationship
my trouble at the entitymsnsger.merge (table1). tabellle1 which is updated. table2 but does not update

many thanks for your help

public void save(Object1 object1, List<Object2> object2List) {
// TODO Auto-generated method stub
try {

Tabelle1 tabelle1 = new Tabelle1();

tabelle1.setNummer(object1.getNnummer());
tabelle1.setName(object1.getName());
tabelle1.setLokal(object1.getLokal());

List<Tabelle2> tabelle2List= new ArrayList<Tabelle2>();
if (object2List!= null) {
for (Object2 Object2new : object2List) {

Tabelle2 tabelle2 = new Object2new ();

tabelle2.setNummer(jobCondidate.getNummer());
tabelle2.setName(jobCondidate.getName());
tabelle2.setNickname(jobCondidate.getNickname());

tabelle2.add(tabelle2new );

}
}

// add list von tabelle2 to tabelle1
tabelle1.setBewerbers(tabelle2);

try {
// Update tabelle1

Tabelle1 tabelle1new= entityManager.find(Tabelle1 .class, tabelle1.getNummer());
if (tabelle1new== null) {
// transaction type=JTA : container managed transaction
entityManager.persist(Tabelle1 );

} else {

entityManager.merge(Tabelle1 );
}

} catch (Exception e) {

e.getMessage();

}

} catch (ClassCastException e) {
System.out.println("Class Cast Exception");
e.printStackTrace();
} catch (IllegalArgumentException e) {
System.out.println("Illegal Argument Exception");
e.printStackTrace();
} catch (Exception e) {
System.out.println("Generic Exception");
e.printStackTrace();
}
}

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Re: merge problem [message #1064747 is a reply to message #1064554]

Thu, 20 June 2013 19:01

Chris Delahunt

Messages: 1294
Registered: July 2009

Senior Member

Does your Tabelle1 bewerbers relationship have the cascade merge and cascade persist settings? Otherwise the merge and persist operations stop at the passed in Tabelle1 instance. Also note that in your code, there is no need to call persist - merge will check if the entity exists and insert it if it doesn't. Persist on the other hand will force inserts, so while you know you want to insert the Tabelle1, it will also cascade to the referenced Tabelle2 instances and force them to be inserted as well. Merge would allow for the provider to check their existence and decide what to do.

Best Regards,
Chris

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