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Salesforce DEX-450 certification exam is designed for Salesforce developers who want to demonstrate their expertise in programmatic development using Apex and Visualforce in Lightning Experience. Programmatic Development using Apex and Visualforce in Lightning Experience certification exam is intended for individuals who have experience developing for the Salesforce platform and are looking to expand their knowledge and skills in programmatic development.
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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q138-Q143):
NEW QUESTION # 138
Which statement should be used to allow some of the records in a list of records to be inserted if others fail to be inserted?
- A. Database.insert(records, true)
- B. Database.insert (records, false)
- C. insert records
- D. Insert (records, false)
Answer: B
Explanation:
To allow partial success when inserting a list of records, the developer should use the Database class methods with the allOrNone parameter set to false.
Option B: Database.insert(records, false)
Correct Answer.
The Database.insert() method allows for partial processing.
By setting the second parameter (allOrNone) to false, the operation will attempt to insert all records.
If some records fail, the successful ones will be committed, and the errors can be examined from the result.
Usage:
Database.SaveResult[] results = Database.insert(records, false);
for (Database.SaveResult sr : results) {
if (sr.isSuccess()) {
// Record inserted successfully
} else {
// Handle errors
for (Database.Error err : sr.getErrors()) {
System.debug(err.getMessage());
}
}
}
The insert statement does not allow partial success; it operates with allOrNone set to true by default.
If any record fails, the entire operation is rolled back.
Option C: Insert(records, false)
Incorrect Syntax.
The insert keyword cannot take parameters.
The correct method with parameters is Database.insert().
Option D: Database.insert(records, true)
Incorrect.
Setting allOrNone to true (default behavior) means that if any record fails, the entire transaction is rolled back.
Conclusion:
To allow partial inserts when some records fail, use Database.insert(records, false), which is Option B.
Reference:
Database Methods for DML
Incorrect Options:
Option A: insert records
Incorrect.
NEW QUESTION # 139
Which code statement includes an Apex method named updateaccounts in the Class AccountCont rolles for use in a Lightning web component?
- A.
- B.
- C.
- D.
Answer: A
NEW QUESTION # 140
A developer created a helper class with a method that can be called from Visualforce pages, web services, triggers, and of even anonymous code. When the method is called from a trigger, the developer needs to execute logic that should not be executed If the method Is called from anywhere else. How can the developer determine if the code Is executed in a trigger context?
- A. Check if Trigger.isExecuting ==true
- B. Check if System.executionContext =='Trigger'.
- C. Use the executeOnTrigger annotation on the method definition.
- D. Check if Trigger.newMap !=null.
Answer: A
NEW QUESTION # 141
A developer creates a custom exception as shown below:
public class ParityException extends Exception. {}
What are two ways the developer can fire the exception in Apex? Choose 2 answers
- A. throw new ParityException() ;
- B. throw new ParityException ('parity docs not match');
- C. new ParityExcaption () ;
- D. new parityException. ('parity does not match');
Answer: A,B
Explanation:
To fire an exception in Apex, the developer must use the throw statement along with an instance of the exception.
Option A: throw new ParityException();
Correct Way.
Creates a new instance of ParityException with no message and throws it.
Syntax is correct for throwing an exception.
Option C: throw new ParityException('parity does not match');
Correct Way.
Creates a new instance of ParityException with a custom message and throws it.
The exception class inherits from Exception, which allows passing a message to the constructor.
Options Not Correct:
Option B: new ParityException('parity does not match');
Incorrect.
This statement creates a new instance of ParityException but does not throw it.
Without the throw keyword, the exception is not fired.
Option D: new ParityException();
Incorrect.
Similar to Option B, this creates a new instance but does not throw it.
The exception will not affect the flow unless it is thrown.
Conclusion:
The two ways the developer can fire the exception are:
Option A: throw new ParityException();
Option C: throw new ParityException('parity does not match');
Both use the throw statement to fire the exception.
NEW QUESTION # 142
What should a developer use to obtain the Id and Name of all the Leads, Accounts, and Contacts that have the company name "Universal Containers?
- A. SELECT Lead.id, Lead.Neme, Account,Id, Account.Neme, Contact.id, Contact.Neame FROM Lead, Account, Contact WHERE CompanyName = "Universal Containers*
- B. PIND 'Universal Centainers' IN Name Fields RETURNING lead(id, name), saceount(id, mame), contact (id, name)
- C. FIND 'Universal Conteiners' IN CompenyName Fields RETURNING leadjid, name), sccount(ad, name}, conteact(id, name)
- D. SELECT lead(id, name), account (id, name}, contact(id, name) FROM Lead, Account, Contact WHERE Name = "Universal Containers'
Answer: B
NEW QUESTION # 143
......
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