Databases use the data types BLOB (binary large object) and CLOB (character large object) to store large objects, like images and very long texts. JPA and Hibernate provide two kinds of mappings for these types. You can choose if you want to: Materialize the LOB and map it to a byte[] or a String. This…
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: In one of the previous Hibernate Tips, I showed how to remove child entities automatically when you remove their…
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…
Mapping a primary key column with JPA and Hibernate is simple. You just need to add an attribute to your entity, make sure that its type and name match the database column, annotate it with @Column and you’re done. You can then use the primary key to load the entity, and Hibernate sets the primary…
Internationalization not only affects the UI. If your application stores user-generated data and supports multiple languages, you also need a way to store different translations in your database. Typical examples are: market places that allow you to provide product descriptions in various languages, travel sites that offer trips to people all over the world and…
