How to use Java Records with Spring Data JPA
Introduction In this article, we are going to see how we can use Java Records with Spring Data JPA Repositories. As I already explained, Java Records cannot be used as JPA entities since the Records are immutable, and JPA requires the entity class to have a default constructor and be modifiable, as that’s how the entity properties are populated when the entity is being fetched from the database. For this reason, this article will show you how to combine Java Records and JPA entities so that you get the best out of… Read More
Spring Load-Time Weaving
Introduction In this article, we are going to see how Spring load-time weaving works so that you can apply the Hibernate bytecode enhancement mechanism at runtime. Traditionally, the bytecode enhancement mechanism is applied when the project is built using a Maven or Gradle plugin. For more details about the build-time approach, check out this article.
Table partitioning with Spring and Hibernate
Introduction In this article, we are going to see how we can implement a table partitioning solution when using Spring and Hibernate. The goal of table partitioning is to split a large table into multiple smaller partition tables so that the associated table and index records can fit into the in-memory Buffer Pool, therefore allowing a more efficient seek or scan.
How to cascade DELETE unidirectional associations with Spring Data JPA
Introduction In this article, we are going to see how to cascade DELETE the unidirectional associations with Spring Data JPA when we cannot rely on the CascadeType mechanism that propagates state transitions from parent to child entities.
How to batch INSERT statements with MySQL and Hibernate
Introduction In this article, we are going to see how we can batch INSERT statements when using MySQL and Hibernate. While Hibernate has long supported automated JDBC batch inserts, this feature doesn’t work when using the IDENTITY identifier generator strategy. Unfortunately, MySQL doesn’t support SEQUENCE objects, so using IDENTITY is the only reasonable option. Therefore, I’m going to show you a technique you can use to get Hibernate batch INSERT statements for entities that use the IDENTITY generator.
The best way to use Spring Data JPA Stream methods
Introduction In this article, we are going to see what is the best way to use Spring Data JPA Stream query methods. When having to fetch a larger result set, the advantage of using a Java Stream is that the query result set could be fetched progressively instead of getting all the data at once.
How to fetch multiple JPA collections with Blaze Persistence MULTISET
Introduction In this article, we are going to see how we can fetch multiple JPA entity collections without generating an implicit Cartesian Product with the MULTISET strategy offered by the Blaze Persistence open-source project. The MULTISET fetch strategy is inspired by the MULTISET operator offered by jOOQ. If you are not familiar with the MULTISET operator, then check out this article first, in which I explain why this jOOQ feature is truly revolutionary.
Spring Data Query By Example
Introduction In this article, we are going to see how the Spring Data JPA Query By Example (QBE) feature works, when you should use it, and what limitations it has. While Spring Data JPA already provides a wide range of options to query data: query methods or the @Query annotation Spring Data JPA Specification custom Repository query methods The Spring Data Query By Example feature is meant to offer a way to decouple the data filtering logic from the query processing engine so that you can allow the data access layer clients… Read More
The best way to validate the DDL schema with Spring and Hibernate
Introduction In this article, we are going to see what is the best way to validate the DDL schema and the JPA entity mappings when using Spring and Hibernate. I decided to write this article after reading this Tweet:
