Explain the concept of Lazy Loading vs. Eager Loading.
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Lazy Loading and Eager Loading are two strategies in Hibernate (and ORM frameworks in general) for fetching associated data from the database.
Lazy Loading means data is loaded on demand. When you fetch an entity, its associated objects (like collections or related entities) are not immediately retrieved. Instead, Hibernate gives you a proxy or placeholder. The actual database query for that association is executed only when you access it in your code. This approach reduces the initial load time and improves performance when related data is not always needed. However, it can lead to issues like the LazyInitializationException if you try to access the data outside the Hibernate session.
Eager Loading means all related data is loaded immediately along with the parent entity. As soon as you fetch an entity, Hibernate joins or runs additional queries to retrieve its associations. This ensures all data is available upfront and avoids lazy loading issues. However, it can degrade performance if large or unnecessary associations are fetched every time, even when they are not used.
👉 In short:
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Lazy Loading = fetch when required, efficient but risky outside session.
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Eager Loading = fetch everything upfront, safe but can be heavier.
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