A beginner’s guide to the high-performance-java-persistence GitHub repository
Introduction When I started writing High-Performance Java Persistence, I realized I needed a GitHub repository to host all the test cases I needed for the code snippets in my book, and that’s how the high-performance-java-persistence GitHub repository was born. The high-performance-java-persistence GitHub repository is a collection of integration tests and utilities so that you can test JDBC, JPA, Hibernate and jOOQ features with the utmost ease.
Hibernate HSQLDB ARRAY Type
Introduction As previously explained, although Hibernate does not support database ARRAY column types by default, you can easily implement a custom Hibernate ArrayType. While the previous solution worked on PostgreSQL, in this article, you are going to see that it is fairly easy to adapt it to HSQLDB.
How to map a JSON collection using JPA and Hibernate
Introduction The open-source Hypersistence Utils project allows you to map Java objects or Jackson JsonNode as JPA or Hibernate entity properties, and, thanks to our awesome contributors, we have added support for storing type-safe JSON collections. In this article, you are going to see how to achieve this goal.
How to bootstrap JPA programmatically without the persistence.xml configuration file
Introduction One of my Twitter followers asked me if there is any documentation for bootstrapping JPA programmatically so that we can replace the persistence.xml configuration file with a Java configuration: Previously, I wrote an article about bootstrapping Hibernate without the persistence.xml, but that solution was based on the Hibernate-specific EntityManagerFactoryBuilderImpl. In this article, I’m going to give you a solution that works with any JPA provider since it’s based on standard Java Persistence API.
How to order entity subclasses by their class type using JPA and Hibernate
Introduction In this article, we are going to see how to order entity subclasses when executing a JPA query with Hibernate.
How to map a JPA @ManyToOne relationship to a SQL query using the Hibernate @JoinFormula annotation
Introduction Someone asked me to answer the following StackOverflow question, and, because the question is very interesting from an SQL perspective, I decided to turn the answer it into a blog post. In this article, we are going to see how to map a JPA @ManyToOne association to the result of a SQL query using the Hibernate-specific @JoinFormula annotation.
How to emulate @CreatedBy and @LastModifiedBy from Spring Data using the @GeneratorType Hibernate annotation
Introduction Hibernate comes with many additions to the standard JPA specification. One such example is the @GeneratorType annotation which allows you to customize the way a given entity property value is automatically generated. If you’re using Spring Data, you can simply use the @CreatedBy and @LastModifiedBy annotations and the annotated entity properties are going to be populated with the currently logged user. If you’re not using Spring Data, then you can easily emulate the same behavior using the Hibernate-specific @GeneratorType annotation and the ValueGenerator callback mechanism.
How to inherit properties from a base class entity using @MappedSuperclass with JPA and Hibernate
Introduction In this article, we are going to see how @MappedSuperclass can help us reuse the @Id mapping of a JPA and Hibernate entity so that it won’t have to be declared on each and every entity.
How does Hibernate handle JPA Criteria API literals
Introduction The JPA specification is like a Java interface, However, when it comes to performance, implementation details matter a lot. That’s why, even if you use the JPA standard, you still need to know how the underlying provider implements the standard specification. For instance, if we take this tweet from Gareth Western: We can clearly see that there is an issue in the way literals might be handled by Hibernate when executing a Criteria API query. Therefore, in this article, we are going to see how literals are handled by Hibernate and… Read More
