Introduction In this article, we are going to see how INNER JOIN works in SQL, and how we can use it to associate rows belonging to different tables and build compound result sets.
Introduction In this article, we are going to see how the PostgreSQL isolation levels guarantee read and write consistency when executing database triggers. While relational database systems provide strong data integrity guarantees, it’s very important to understand how the underlying transactional engine works in order to choose the right design for your data access layer.
Introduction In this article, I’m going to show you how to map PostgreSQL ARRAY column types (e.g., text, int, double, enum, date, timestamp, UUID) to Java List entity attributes with JPA and Hibernate. While the Hibernate Types project has been supporting PostgreSQL ARRAY column types since the very first version, prior to version 2.9, you could only map database ARRAY columns to Java Array entity attributes, as illustrated by this article. Mapping database ARRAY columns to java.util.List entity attributes is a much better approach than using the previous Java Array option since,… Read More