How to find by email with JPA?

Question

How to find by email with JPA? My this but not worked
public WnUser findUser(WnUser email) {
return (WnUser) em.createQuery
("SELECT object(u.email) FROM entities.WnUser u WHERE u.email =:email").setParameter("email", email.getEmail()).getSingleResult();
javax.ejb.EJBException: javax.persistence.NoResultException: No entity found for query
12:23:44,843 ERROR [STDERR]      at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:63)
12:23:44,843 ERROR [STDERR]      at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
12:23:44,843 ERROR [STDERR]      at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)
12:23:44,843 ERROR [STDERR]      at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)

Answer 1

First off, you are not really doing:
GWAccount->GWAddressBook->GWAddressBookEntrie->
get_EmailAddress,get_DisplayName()
are you?
If you enter the full line, it will read in all
of the entries each time it is called.
You should break each part into an object:
gwAccount
gwBook
gwEntries
I'm not sure what you are doing.
Are you trying to compose an email?
If so, why are you not using Recipients.Resolve()?
Are you trying to get the recipients from an email?
Preston
>>> On Friday, April 16, 2010 at 1:26 AM,
hillp<[email protected]>
wrote:
> as title,
> i can get the display name from the to, cc, bc edit box,
> then i need to get the email address,
> current i use object API to query:
>
GWAccount‑>GWAddressBook‑>GWAddressBookEntrie >get_EmailAddress,get_Di
splayName
> but i find it is really slow when there are many contacts, example
> 10000.
>
> so is there any other effective method to get the email address?