Users' questions

What is the lazy loading in hibernate?

What is the lazy loading in hibernate?

Hibernate now can “lazy-load” the children, which means that it does not actually load all the children when loading the parent. Instead, it loads them when requested to do so. You can either request this explicitly or, and this is far more common, hibernate will load them automatically when you try to access a child.

What is lazy and eager in hibernate?

Lazy and Eager are two types of data loading strategies in ORMs such as hibernate and eclipse Link. Lazy Loading − Associated data loads only when we explicitly call getter or size method. Use Lazy Loading when you are using one-to-many collections.

What is lazy and eager?

While lazy loading delays the initialization of a resource, eager loading initializes or loads a resource as soon as the code is executed. Eager loading also involves pre-loading related entities referenced by a resource.

How to enable lazy loading in hibernate annotations?

To enable lazy loading explicitly you must use “fetch = FetchType.LAZY” on a association which you want to lazy load when you are using hibernate annotations. Another attribute parallel to “FetchType.LAZY” is “FetchType.EAGER” which is just opposite to LAZY i.e. it will load association entity as well when owner entity is fetched first time.

When to use lazy annotation in spring core?

By default, the Spring IoC container creates and initializes all singleton beans at time of application startup. We can prevent this pre-initialization of a singleton bean by using the @Lazy annotation. The @Lazy annotation may be used on any class directly or indirectly annotated with @Component or on methods annotated with @Bean.

Why do you set fetchtype to lazy in hibernate?

If we set FetchType.LAZY, then until we fetch the collection, the collection will not be loaded. If we set FetchType.EAGER, then collection will be loaded at the same time when the parent entity is loaded. FetchType is useful for the performance of system. If an entity is not needed to load collections, FetchType can be set to LAZY and vice- versa.

Which is the opposite of lazy in hibernate?

Fetch type Eager is essentially the opposite of Lazy, Eager will by default load ALL of the relationships related to a particular object loaded by Hibernate. This means that if you change the relationship to be this: