ByThorben JanssenDatabases support various data types to store date and time information. The most commonly used ones are: DATE to save a date without time information, TIME to store a time without a date, and TIMESTAMP to store date and time information. You can map all of them with JPA and Hibernate. But you need to…
ByThorben JanssenDTOs are easy to use and the most efficient projection for read-only operations. So, whenever you don’t need to change the requested information, you should prefer a DTO projection. But what exactly is a DTO? How does such a projection work with Hibernate? And how can you use it in your queries? I will answer…
ByThorben JanssenThe access strategy defines how your JPA implementation, e.g., Hibernate or EclipseLink, access your entity attributes. You can choose between field-based access and property-based access: If you use field-based access, your JPA implementation uses reflection to read or write your entity attributes directly. It also expects that you place your mapping annotations on your entity attributes….
ByThorben JanssenA solid understanding of JPA and its implementations is still one of the most in-demand skills among Java developers. So, it’s no surprise that there are several blog posts, books, and courses available that teach you how to implement a persistence layer using the JPA specification. I even recorded a JPA for Beginners course myself. But…
ByThorben JanssenIn JPA, the persistence.xml file is the central piece of configuration. That makes it one of the most important files of your persistence layer. So, it shouldn’t be a surprise that the JPA for Beginners in the Persistence Hub contains an entire lecture about it. And I thought it’s also something that I should share…