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SCWCD Certification Practice Tests SCWCD Study Guide (CX-310-081)

 

 

 

 

 

 

 

 
 
 SCBCD Certification Practice Test  

Features Of CertGear's SCBCD (CX-310-090) Certification Practice Test

  • Learn As You Go - Detailed explanations tell you not just the right answer, but why the right answer is right and the wrong answers are wrong. References for further study are also provided.

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    Timed, Live scoring, Randomization, Ask Incorrect, Show Answer, Select # of questions.

  • Ask Only The Questions You Got Wrong - This is a great feature. At the end of the exam, instead of being asked every question again, you can tell the test engine to only ask you questions that you got incorrect.

  • Randomization - The tests in our certification mode are dynamic, not fixed like some other practice tests are, so you'll get a new test every time. Each test is timed and the objectives are weighted the same as on the real exam.

  • History - The test engine keeps a history of all the exams and scores you have achieved on those tests. You can easily track your progress and help determine when you are ready to take the actual exam.

  • Categories - Many tests contain categories for you to selectively study topics. Additionally, you can see your grade in each category at the end of the exam.

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Free SCBCD Certification Practice Questions:

Consider the following CMP entity beans and their corresponding relationships:


Based on the diagram, the following relationships exists across the entity beans:
1) CustomerEJB (1) <--> OrderEJB (n)
2) OrderEJB (1) <--> LineItemEJB (n)
3) CustomerEJB (1) <--> AddressEJB (n)

Which of the following EJB-QL statements can be used to return all orders which include a 'HDTV' as a line item?

A) SELECT OBJECT(o) FROM Order o, IN (o.lineItems) li
WHERE li.item_type='HDTV'

B) SELECT OBJECT(o) FROM Order o
WHERE o.lineItems.item_type='HDTV'

C) SELECT OBJECT(o) FROM Order o
WHERE lineItems.item_type='HDTV'

D) SELECT o FROM Order o, IN (o.lineItems) li
WHERE li.item_type='HDTV'

E) SELECT o FROM Order o
WHERE o.lineItems.item_type='HDTV'

  • [Ans: A]

  • In the SELECT clause, since the return type is a bean type (Order) and not a CMP field type, the OBJECT() operator needs to be used. In general, if the return type is the bean's abstract schema type in the SELECT clause, the OBJECT () operator should be used.

    For example:

    <abstract-schema-name> Order </abstract-schema-name>
    Select OBJECT (o) From Order o

    VERSUS
     
    <cmp-field>
    <field-name> item_type </field-name>
    </cmp-filed>
    SELECT li.item_type FROM LineItem li
     


    The IN operation must be used in the FROM clause, as the OrderEJB references a collection of LineItemEJB's. Specifically an Order can contain one or more Line Items. It is syntactically incorrect to compose a path expression from a path expression that evaluates to a collection.

    For example, since o designates Order, the path expression o.lineItems is illegal since navigation to lineItems results in a collection. To handle such a navigation, the IN operator should be used to range over the elements of the lineItems collection.

    Hence, the correct answer is:

    SELECT OBJECT(o) FROM Order o, IN (o.lineItems) li
    WHERE li.item_type='HDTV'


    References: http://java.sun.com/products/ejb/docs.html (EJB2.0 Specs, Section 11.2.6.6)

 

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