What does session.load() return if there is no matching database row ?
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NULL
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Empty Object
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Unrecoverable exception
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None of the above
session.load() throws an unrecoverable ObjectNotFoundException if no matching database row exists, because load() expects the row to exist (it may return a proxy). This differs from session.get(), which returns null if no row is found. Options A and B are incorrect because load() does not return null or empty objects - it throws an exception.
To answer this question, let's understand the purpose of the session.load() method in the context of working with a database.
The session.load() method is used in Object-Relational Mapping (ORM) frameworks, such as Hibernate in Java or SQLAlchemy in Python, to load an object from the database based on its identifier (ID) without actually hitting the database. It returns a proxy object that is associated with the given ID.
In the case where there is no matching database row for the given ID, the session.load() method does not throw any exception or return NULL or an empty object. Instead, it returns a proxy object that represents the requested entity, but the proxy object is not backed by a corresponding row in the database.
Therefore, the correct answer is:
Option C) Unrecoverable exception - This option is correct because the session.load() method does not throw an exception when there is no matching database row. Instead, it returns a proxy object without any data, which might lead to an unrecoverable exception if you try to access properties or perform operations on the proxy object.
Note: It is important to handle this scenario properly in your code to avoid any unexpected behavior or errors.