Hibernate Tips is a series of posts in which I describe a quick and easy solution for common Hibernate questions. If you have a question for a future Hibernate Tip, please post a comment below. Question: Himanshu Srivastava asked today’s question on my YouTube channel: “What’s the difference between@JoinColumn and @PrimaryKeyJoinColumn? Also, should we use…
Hibernate Tips is a series of posts in which I describe a quick and easy solution for common Hibernate questions. If you have a question for a future Hibernate Tip, please post a comment below. Question: On my tutorial about JPA’s EntityGraphs, Bipin Shrestha asked the following question: “Can you show me an example of…
Spring Data JPA provides various options to define and execute queries. All of them use JPA’s query capabilities but make them a lot easier to use. You can: reference a named native or JPQL query, derive queries from the name of a repository method and declare a query using the @Query annotation. I already explained…
The most efficient way to improve the performance of a database query is to avoid it by retrieving the data from a local cache. That’s why Hibernate offers 3 different caches: The 1st level cache contains all entities loaded and created within the current session. The 2nd level cache is a shared, session-independent cache for…
Derived queries are very comfortable to use as long as the queries are not too complicated. But as soon as you use more than 2-3 query parameters or need to define multiple joins to other entities, you need a more flexible approach. In these situations, you better use Spring Data JPA’s @Query annotation to specify…
