Spring Data JPA’s repositories provide many methods that implement the standard operations you need to create a basic persistence layer. One of them is the save(S entity) method, which the CrudRepository defines. When you call this method, it depends on the entity object’s state which database operation Spring Data JPA performs. Spring Data JPA stores a new…
Database administrators often use views to combine, transform and present data in a form that’s easy to process and query by the application. They are easier to maintain and optimize than a complex query statement that’s developed and maintained in one or more applications. Using Spring Data JPA, you can map and query views in…
With Spring Data JPA, you can use more features than just the ones defined by the JPA specification. It acts as a layer on top of a persistence provider, e.g., Hibernate. This provider implements the JPA specification and provides a set of proprietary features. Due to this multi-layer architecture, you can use all standard JPA…
When using Spring Data JPA, you are used to derived and custom queries that return the result in your preferred format. A typical example is a DTO projection, which is the most efficient one for read-only operations. To use it in a derived or custom JPQL query, you only need to change the return type…
Before Spring Boot, you had to do quite a few things to set up Spring Data JPA. You not only had to annotate your entity classes with mapping annotations, add a dependency to Spring Data JPA and configure your database connection. You also had to enable repositories and transaction management and configure your EntityManagerFactory. That…
