An Introduction to JPA FetchTypes

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The JPA FetchType defines when Hibernate gets the related entities from the database, and it is one of the crucial elements for a fast persistence tier. In general, you want to fetch the entities you use in your business tier as efficiently as possible. But that’s not that easy. You either get all relationships with one query or you fetch only the root entity and initialize the relationships as soon as you need them.

I’ll explain both approaches in more detail in this video and also provide you some links to more advanced solutions that combine flexibility and efficiency.

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#JPA #FetchTypes #Hibernate #LazyLoading

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Done thanks
Default fetch type:
Lazy for a tomany relationship
Eager for a toone relationship

Jpql query with join fetch entity.relatedEntity to force hibernate to fetch a lazy relationship with one query (doing a join) instead of doing a separate select when we access entity.relatedEntity

mostinho

An Introduction to JPA FetchTypes

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