Salesforce 面试题与答案
问题 41. What is the purpose of the 'System.runAs()' method in Apex testing?
The 'System.runAs()' method in Apex testing is used to run a block of code with the specified user context. It is often used to test code that depends on user permissions and profiles.
问题 42. Explain the concept of a junction object in Salesforce.
A junction object in Salesforce is a custom object with two master-detail relationships. It is used to model many-to-many relationships between two objects. Junction objects are commonly used in complex data models.
问题 43. What is the purpose of the '@isTest' annotation in Apex?
The '@isTest' annotation in Apex is used to define a class or method as a test class or test method. It ensures that the enclosed code is treated as test code and doesn't count against the organization's code size limits.
问题 44. Explain the use of the 'Database.upsert()' method in Apex.
The 'Database.upsert()' method in Apex is used to insert or update records based on a specified external ID. It allows developers to perform upsert operations in a single call, reducing the number of DML statements.
问题 45. What is the purpose of the 'force:recordData' Lightning component in Salesforce?
The 'force:recordData' Lightning component in Salesforce is used to create, read, and update records without writing Apex code. It provides a declarative way to interact with record data in Lightning components.
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