How to call Named Query - jpa

Question

I wrote a named query in the entity class Voter
NamedQuery(name = "Voter.findvoter", query = "SELECT count(*) FROM Voter v WHERE v.voterID = :voterID" and where v.password= : password),
I want to call this named query and I also need to set voterID and password.
Can you help me. Thank you

Answer 1

I assume you've missed the # symbol on your NamedQuery annotation?
In the code, you'd call it like this:
List results = em.createNamedQuery("Voter.findvoter")
.setParameter("voterID", "blah")
.setParameter("password","blahblahblah")
.getResultList();

Answer 2

There are two obvious issues with your named query that would cause a problems:
It is an annotation so it should be #NamedQuery not just NamedQuery
Your query is currently:
query = "SELECT count(*) FROM Voter v WHERE v.voterID = :voterID" and where v.password= : password.
The problem is that you terminate your String after :voterID, instead of after :password and you have "where" twice and you have a space between ":" and "password". Your query should look like this:
query = "SELECT count(*) FROM Voter v WHERE v.voterID = :voterID and v.password= :password"
(I have just moved the " to the end and removed the second "where" and the space after the ":")

Answer 3

The common steps are (named query or otherwise)
Create a query - em has five create methods.
Set the query up with parameters if needed - the query interface has these methods.
Execute the query - the query interface has 3 execution related methods.
with the above three steps you can run any JPA query.

Answer 4

Actually brent is right your NameQuery should be something like this,
#NamedQuery(name = "Voter.findvoter", query = "SELECT count(*) FROM Voter v WHERE v.voterID = :voterID AND where v.password = :password")
#Entity
public class Voter implements Serializable{ ... }
and somewhere else you should try this one (which Dick has already said)
public class VoterFasade{
public List<Voter> findVoter(long id,String password){
List<Voter> results = em.createNamedQuery("Voter.findvoter")
.setParameter("voterID", id)
.setParameter("password",password)
.getResultList();
return result;
}
}
then you could use it like
#Inject
VoterFasade voterFasade;
///
long id=12;
voterFasade.findVoter(id);
should actually working.(its an uncompiled code).
you could also do it with Repository, check the link below, part Repository Listing23.Example repository
enter link description here