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Identify correct and incorrect statements or examples about the purpose and use of EJB QL.

This page discusses - Identify correct and incorrect statements or examples about the purpose and use of EJB QL.

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Chapter 5. Client View of an Entity Identify correct and incorrect statements about the Application Assembler's responsibilities, including the use of deployment descriptor elements related to transactions and the identifica Given a list of responsibilities, identify whose which are the Container's with respect to transactions, including the handling of getRollbackOnly, setRollbackOnly, getUserTransacti EJB Transactional Attributes Chapter 11. Transactions Given a list of scenarios, identify which will result in an ejbRemove method not being called on a bean instance. Given a list of responsibilities related to session beans, identify those which are the responsibility of the session bean provider and those which are the responsibility of the EJB contai Given a list of methods for a stateful or stateless session bean class, define which of the following operations can be performed from each of those methods: SessionContext interface metho Chapter 4. Session Bean Life Cycle Identify correct and incorrect statements or examples about the client view of a session bean's local and remote component interfaces. Identify the interface and method for each of the following: retrieve the session bean's remote home interface, retrieve the session bean's local component interface, determine if the sessio Match the correct description about purpose and function to which session bean type they apply: stateless, stateful, or both. Chapter 14. Security Management Given a security-related deployment descriptor tag, identify correct and incorrect statements and code related to that tag. Given a list of responsibilities, identify which belong to the deployer, bean provider, application assembler, container provider, system administrator, or any combination. From a list of responsibilities, identify which belong to the application assembler, bean provider, deployer, container provider, or system administrator. Part I. Exam Objectives Preface Identify the interfaces and methods a JMS message-driven bean must implement. Identify the use and behavior of the MessageDrivenContext interface methods. SCBCD Study Guide Given a list of responsibilities related to exceptions, identify those which are the bean provider's, and those which are the responsibility of the container provider. Be prepared to recog Given a particular method condition, identify the following: whether an exception will be thrown, the type of exception thrown, the container's action, and the client's view. Identify correct and incorrect statements or examples about application exceptions and system exceptions in entity beans, session beans, and message-driven beans. Identify correct and incorrect statements or examples about the client's view of exceptions received from an enterprise bean invocation. Identify correct and incorrect statements or examples about an entity bean's primary key and object identity. Identify the use, syntax, and behavior of, the following entity bean home method types, for Container-Managed Persistence (CMP); finder methods, create methods, remove methods, and home me Chapter 8. Entity Beans Chapter 13. Enterprise Bean Environment Chapter 2. Client View of a Session Bean Match EJB roles with the corresponding description of the role's responsibilities, where the description may include deployment descriptor information. Given a list, identify which are requirements for an EJB-jar file. Identify correct and incorrect statements or examples about the client view of a entity bean's remote component interface (EJBObject). Identify correct and incorrect conditional expressions, BETWEEN expressions, IN expressions, LIKE expressions, and comparison expressions. Identify correct and incorrect statements or examples about the purpose and use of EJB QL. Chapter 9. EJB-QL Identify correct and incorrect statements or examples about EJB programming restrictions. Chapter 1. EJB Overview Identify EJB 2.0 container requirements. Identify correct and incorrect statements or examples about the client view of an entity bean's local component interface (EJBLocalObject). Chapter 12. Exceptions Identify the use and the behavior of the ejbPassivate method in a session bean, including the responsibilities of both the container and the bean provider. Identify correct and incorrect statements about the purpose and use of the deployment descriptor elements for environment entries, EJB references, and resource manager connection factory r Chapter 10. Message-Driven Bean Component Contract Given a code listing, determine whether it is a legal and appropriate way to programmatically access a caller's security context. From a list, identify the responsibility of the container for a CMP entity bean, including but not limited to: setEntityContext, unsetEntityContext, ejbCreate, ejbPostCreate, ejbActi Identify correct and incorrect statements or examples about the rules and semantics for relationship assignment and relationship updating in a CMP bean. Chapter 7. CMP Entity Bean Life Cycle From a list, identify the purpose, behavior, and responsibilities of the bean provider for a CMP entity bean, including but not limited to: setEntityContext, unsetEntityContext, ejbC Identify correctly-implemented deployment descriptor elements for a CMP bean (including container-managed relationships).
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Identify correct and incorrect statements or examples about the purpose and use of EJB QL.

Find all orders:
SELECT OBJECT(o)
FROM Order o
					
Find all orders that need to be shipped to Colorado:
SELECT OBJECT(o)
FROM Order o
WHERE o.shipping_address.state = 'CO'
					
Find all states for which there are orders:
SELECT DISTINCT o.shipping_address.state
FROM Order o
					
Find all orders that have line items:
SELECT DISTINCT OBJECT(o)
FROM Order o, IN(o.lineItems) l
					
This query can also be written as:
SELECT OBJECT(o)
FROM Order o
WHERE o.lineItems IS NOT EMPTY
					
Find all orders that have no line items:
SELECT OBJECT(o)
FROM Order o
WHERE o.lineItems IS EMPTY
					
Find all pending orders:
SELECT DISTINCT OBJECT(o)
FROM Order o, IN(o.lineItems) l
WHERE l.shipped = FALSE
					
Find all orders in which the shipping address differs from the billing address. This example assumes that the Bean Provider uses two distinct entity beans to designate shipping and billing addresses:
SELECT OBJECT(o)
FROM Order o
WHERE NOT 
	(o.shipping_address.state = o.billing_address.state AND
	o.shipping_address.city = o.billing_address.city AND
	o.shipping_address.street = o.billing_address.street)
					
If the Bean Provider uses a single entity bean in two different relationships for both the shipping address and the billing address, the above expression can be rewritten as:

SELECT OBJECT(o)
FROM Order o
WHERE o.shipping_address <> o.billing_address

					
Find all orders for a book titled 'Head First EJB':
SELECT DISTINCT OBJECT(o)
FROM Order o, IN(o.lineItems) l
WHERE l.product.type = 'book' AND
	l.product.name = 'Head First EJB'
					
The following query finds the orders for a product whose name is designated by an input parameter (the input parameter must be of the type of the product name, i.e., a String):
SELECT DISTINCT OBJECT(o)
FROM Order o, IN(o.lineItems) l
WHERE l.product.name = ?1
					
The following EJB QL query selects the names of all products that have been ordered. It illustrates the selection of values other than entity beans, therefore it can be used only for SELECT methods, not for FINDER methods:
SELECT DISTINCT l.product.name
FROM Order o, IN(o.lineItems) l
					
The following query finds the names of all products in the order specified by a particular order number.
SELECT l.product.name
FROM Order o, IN(o.lineItems) l
WHERE o.ordernumber = ?1
					
The following query returns the names of all the cities of the shipping addresses of all orders. The result type of the SELECT method, which is either java.util.Collection or java.util.Set, determines whether the query may return duplicate city names.
SELECT o.shipping_address.city
FROM Order o
					

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Identify correct and incorrect statements or examples about the purpose and use of EJB QL.

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