Posted on November 26, 2024 by vladmihalcea
Avoid using Set for bidirectional JPA OneToMany collections
Introduction In this article, we are going to see why there is no benefit in using the Set collection type when mapping a bidirectional JPA OneToMany association. While the @OneToMany annotation can be used to map both unidirectional and bidirectional associations, as I explained this article, you should avoid the unidirectional mapping since it can lead to very inefficient SQL statements.
Posted on February 5, 2020 by vladmihalcea
How to map a PostgreSQL ARRAY to a Java List with JPA and Hibernate
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. As illustrated by this article, the Hypersistence Utils project provides support for mapping PostgreSQL ARRAY column types to Java Array entity attributes/ However, you can also map database ARRAY columns to java.util.List entity attributes, as it’s much more convenient to use Java Collections than Arrays.
