Develop Object-Oriented Code MB-500 Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   In X++, what is the primary purpose of the QueryBuilder class?

   • ATo manage database connections
   • BTo optimize query performance automatically
   • CTo construct and execute dynamic queries programmatically
   • DTo define static queries in the AOT
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2. 27foundation · easy

   In X++, which keyword is used to declare a delegate?

   • Afunction
   • Bevent
   • Cdelegate
   • Dcallback
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4. 28application · medium

   A developer needs to send an email notification whenever a purchase order is confirmed. The standard PurchaseOrderTable has a method that confirms the order. The developer wants to avoid modifying the standard method. Which approach should be used?

   • AUse Chain of Command to wrap the confirm method and send the email after next().
   • BOverride the confirm method in a new class that extends PurchaseOrderTable.
   • CCreate an event handler class and subscribe to the post-event of the confirm method.
   • DModify the confirm method to call a custom email-sending function.
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5. 29foundation · easy

   In X++, which object is used to define a query that retrieves data from the database?

   • AQueryRun
   • BSelect
   • CQueryBuildDataSource
   • DQuery
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6. 30expert · hard

   A developer is designing a notification system that needs to send different types of notifications (email, SMS, push) based on user preferences. The developer wants to use delegates to allow different notification methods to be registered dynamically. Which design pattern is most appropriate?

   • ADefine a delegate for each notification type and subscribe to them in a central notification manager.
   • BDefine a single delegate that takes a notification type parameter and switch on it.
   • CUse Chain of Command to override the notification sending method.
   • DUse event handlers to subscribe to a single event and check the notification type.
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