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- Oracle.1Z0-898.v2018-04-11.q63
- Question 27
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Question 27/63
A user entity is in a one-to-many relationship with a Book entity. In other words, a developer reach the collection of books that a user instance myUser has by using the path expression-"myuser -books".
A developer wants to write a Java Persistence query that returns all users that have only two books.
Which two are valid queries that return this information? (Choose two.)
A developer wants to write a Java Persistence query that returns all users that have only two books.
Which two are valid queries that return this information? (Choose two.)
Correct Answer: A,C
Explanation/Reference:
A (not D): The SIZE(collection) function returns the number of elements in a specified collection.
For example :
SIZE(c.languages) is evaluated to the number of languages in that collection.
C: Example(the aggregate query returns a Long):
Query q2 = em.createQuery(
"SELECT COUNT(e) FROM Employee e WHERE e.salary > :limit");
Reference: Collections in JPQL and Criteria Queries; Java Persistence Query Return Types
A (not D): The SIZE(collection) function returns the number of elements in a specified collection.
For example :
SIZE(c.languages) is evaluated to the number of languages in that collection.
C: Example(the aggregate query returns a Long):
Query q2 = em.createQuery(
"SELECT COUNT(e) FROM Employee e WHERE e.salary > :limit");
Reference: Collections in JPQL and Criteria Queries; Java Persistence Query Return Types
- Question List (63q)
- Question 1: Which cascade option can be specified in a mapping descripto...
- 1 commentQuestion 2: Consider the following web application: (Exhibit) Here MyEnt...
- Question 3: Which of the following Criteria query snippets demonstrates ...
- Question 4: A developer needs to include a set of managed classes in a p...
- Question 5: The developer wants to override the default mappings for an ...
- Question 6: The Contact Information embeddable class contains address in...
- Question 7: Given the following code: Public void create () { try { doA ...
- Question 8: An application that uses pessimistic locking calls an update...
- Question 9: Consider a persistence application with following entity: @E...
- Question 10: An entity person is mapped to a table PERSON and has a colle...
- Question 11: A session bean business method invokes UserTransaction.setRo...
- Question 12: If a Persistence application locks entity x with a LockModeT...
- Question 13: A session bean business method throws an exception during ex...
- Question 14: A developer wants to ensure that an entity's data is up-to-d...
- Question 15: An application has two entities, Department and Employee, an...
- Question 16: A developer who is designing entity classes to map a legacy ...
- Question 17: An application uses an application-managed entity manager. W...
- Question 18: The developer wants to write a criteria query that will retu...
- Question 19: A stateless session bean's business method invokes EJBContex...
- Question 20: A user entity is retrieved in a query and stored in an insta...
- Question 21: Persistence application locks entity x with a LockModeType. ...
- Question 22: Given two entities with one to-one association: @ Entity pub...
- Question 23: Consider a persistence application with the following orm.xm...
- Question 24: FooBean and BarBean are both EJB 3.0 stateless beans with co...
- Question 25: Which two of the following statements are true of embeddable...
- Question 26: An application wants to utilize side effects of cascading en...
- Question 27: A user entity is in a one-to-many relationship with a Book e...
- Question 28: A developer is creating an entity which is mapped to a table...
- Question 29: An application creates a TypedQuery object to perform a quer...
- Question 30: A developer is writing an application with three java Persis...
- Question 31: The department entity has a unidirectional OneToMany relatio...
- Question 32: A JavaEE application is packaged as follows. (Exhibit) Which...
- Question 33: If an application uses an extended persistence context, whic...
- 1 commentQuestion 34: Which statement is correct about the Java Persistence API su...
- Question 35: The developer has modeled student interests as a set <Str...
- Question 36: An application has two entities, parson and Address. (Exhibi...
- Question 37: WhichEntityManager API will lock entity with a pessimistic l...
- Question 38: A developer wants to create a Java Persistence query that wi...
- Question 39: The developer wants to define a unidirectional relationship ...
- Question 40: An application uses optimistic locking by defining version a...
- Question 41: Entity lifecycle callback methods may be defined in which th...
- Question 42: An application has three entities: the mapped superclass per...
- Question 43: Which one of the following queries selects the customer whos...
- Question 44: It a Persistence application locks entity x with a pessimist...
- Question 45: Given: @PersistenceContext EntityManager em; public boolean ...
- Question 46: A developer wants to model the grades for a student as a Map...
- Question 47: A developer has created an application managed entity manage...
- Question 48: If a Persistence application locks entity x with a pessimist...
- Question 49: Given the following entity classes: @Entity @cacheable (true...
- Question 50: The developer is creating a Java Persistence model for a leg...
- Question 51: Given the following stateless session bean implementation cl...
- Question 52: A developer wrote an entity class with the following method:...
- Question 53: The developer wants to write a portable criteria query that ...
- Question 54: An application that uses container-managed transaction demar...
- Question 55: A named query that sets an exclusive pessimistic on the enti...
- Question 56: Refer to the Exhibit. (Exhibit) A developer wants to have bo...
- Question 57: The developer has defined the following entity class office:...
- Question 58: Given a set of CMT bean methods with the following transacti...
- Question 59: The embeddable class ContractInformation is used in an eleme...
- Question 60: A developer has created a deep entity class hierarchy with m...
- Question 61: Which statement is true about the @OrderColumn annotation?...
- Question 62: A developer wants to write a type-safe Criteria API query. W...
- Question 63: Given two entities with many-to-many bidirectional associati...
