What is getSingleResult?

What is getSingleResult?

getSingleResult throws NonUniqueResultException , if there are multiple rows. It is designed to retrieve single result when there is truly a single result. The way you did is fine and JPA is designed to handle this properly.

How does Java handle no result exception?

You can catch NoResultException in the catch-clause, because the transaction won’t be marked as rollback, when JPA is throwing NoResultException. Or you can use getResultList() and check if size is exactly “1”, so you know you have found your user.

Which method can be used in place of the getSingleResult () method to fetch multiple rows?

There is an alternative which I would recommend: Query query = em. createQuery(“your query”); List elementList = query. getResultList(); return CollectionUtils.

What is NoResultException?

public class NoResultException extends PersistenceException. Thrown by the persistence provider when Query. getSingleResult() or TypedQuery. getSingleResult() is executed on a query and there is no result to return. This exception will not cause the current transaction, if one is active, to be marked for rollback.

What is default fetch type in hibernate?

By default, Hibernate uses lazy select fetching for collections and lazy proxy fetching for single-valued associations. These defaults make sense for most associations in the majority of applications.

How do you handle javax persistence NoResultException No entity found for query?

Yes. You need to use the try/catch block, but no need to catch the Exception . As per the API it will throw NoResultException if there is no result, and its up to you how you want to handle it. DrawUnusedBalance drawUnusedBalance = null; try{ drawUnusedBalance = (DrawUnusedBalance)query.

What is javax persistence NoResultException?

javax.persistence.NoResultException: No entity found for query. OR. javax.persistence.NonUniqueResultException: result returns more than one elements. Then it is most likely that your database does not have even a single record matching your query OR you have too many results being returned.

How do you get NoResultException?

Can getResultList return null?

getResultList() returns an empty list instead of null . So check isEmpty() in the returned result, and continue with the rest of the logic if it is false.

Which method is used for getting single Object as result out of query?

The getResultIterator method runs a SELECT query and returns the query results using an Iterator where each result is either an Object for a single-valued query, or an Object array for a multiple-valued query.

How does Hibernate fetch lazy attribute?

To enable lazy loading explicitly you must use “fetch = FetchType. LAZY” on a association which you want to lazy load when you are using hibernate annotations. private Set products; Another attribute parallel to “FetchType.

What is Hibernate lazy?

Lazy setting decides whether to load child objects while loading the Parent Object. You need to do this setting respective hibernate mapping file of the parent class. Lazy = true (means not to load child)By default the lazy loading of the child objects is true.

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