How to map JSON objects using generic Hibernate Types
Introduction In this article, we are going to see how you can map a JSON column to a JPA entity attribute using the Hypersistence Utils open-source project. While you can create your own custom Hibernate Types, for mapping JSON column types on Oracle, SQL Server, PostgreSQL, or MySQL, you don’t need to implement your own Hibernate Type since the Hypersistence Utils project already offers this functionality.
High-Performance Java Persistence – Part Two
Another milestone has been reached The second part of High-Performance Java Persistence book is out. It’s been almost a year since I started writing this book, and seven months since I published the first part.
How to implement a custom String-based sequence identifier generator with Hibernate
Introduction One of my blog readers bumped into the assigned generator with a sequence or an identity column post and wondered if it was possible to generate String-based identifiers instead. I accepted the challenge and answered his question on StackOverflow. However, this post is going to explain this topic in greater detail, so there we go.
How to implement equals and hashCode using the JPA entity identifier (Primary Key)
Introduction As previously explained, using the JPA entity business key for equals and hashCode is always the best choice. However, not all entities feature a unique business key, so we need to use another database column that is also unique as the primary key. But using the entity identifier for equality is very challenging, and this post is going to show you how you can use it without issues.
The Open Session In View Anti-Pattern
Introduction Open Session in View is an Anti-Pattern, and this post is going to demonstrate why it is so. First of all, let’s start with the Wikipedia definition of an Anti-Pattern: An anti-pattern (or antipattern) is a common response to a recurring problem that is usually ineffective and risks being highly counterproductive.
How to call PostgreSQL functions (stored procedures) with JPA and Hibernate
Introduction This article is part of a series of posts related to calling various relational database systems stored procedures and database functions from Hibernate. The reason for writing this down is because there are many peculiarities related to the underlying JDBC driver support and not every JPA or Hibernate feature is supported on every relational database.
High-Performance Java Persistence – Chapter 16 – Caching
Part 2, Chapter 16 Every new chapter of my book is released right after it’s being completed, so the reader doesn’t have to wait for the whole part to be finished to get access to new material. Table of content This chapter explains how enterprise caching works, from database internal buffers, to application-level caching, and the second-level cache offered by Hibernate.
How to call SQL Server stored procedures and functions with JPA and Hibernate
Introduction This article is part of a series of posts related to calling various relational database systems stored procedures and database functions from Hibernate. The reason for writing this down is because there are many peculiarities related to the underlying JDBC driver support and not every JPA or Hibernate feature is supported on every relational database.
How to run database integration tests 20 times faster
Introduction In-memory databases such as H2, HSQLDB, and Derby are great to speed up integration tests. Although most database queries can be run against these in-memory databases, many enterprise systems make use of complex native queries which can only be tested against an actual production-like relational database. In this post, I’m going to show you how you can run PostgreSQL and MySQL integration tests almost as fast as any in-memory database.
High-Performance Java Persistence – Chapter 15 – Fetching
Part 2, Chapter 15 Every new chapter of my book is released right after it’s being completed, so the reader doesn’t have to wait for the whole part to be finished to get access to new material. Table of content This chapter explains how fetching works in Hibernate.
