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Spring Data JPA – Adding a Method in All Repositories 1. Overview Spring Data makes the process of working with entities a lot easier by merely defining repository interfaces. These come with a set of pre-defined methods and allow the possibility of adding custom methods in each interface. However, if… Continue Reading spring-data-jpa-method-in-all-repositories

Composite Primary Keys in JPA 1. Introduction In this tutorial, we’ll learn about Composite Primary Keys and the corresponding annotations in JPA. 2. Composite Primary Keys A composite primary key – also called a composite key – is a combination of two or more columns to form a primary key… Continue Reading jpa-composite-primary-keys

Defining JPA Entities 1. Introduction In this tutorial, we’ll learn about the basics of entities along with various annotations that define and customize an entity in JPA. 2. Entity Entities in JPA are nothing but POJOs representing data that can be persisted to the database. An entity represents a table… Continue Reading jpa-entities

Introduction to Spring Data JPA 1. Overview This article will focus on introducing Spring Data JPA into a Spring project and fully configuring the persistence layer. For a step by step introduction about setting up the Spring context using Java based configuration and the basic Maven pom for the project,… Continue Reading the-persistence-layer-with-spring-data-jpa

CrudRepository, JpaRepository, and PagingAndSortingRepository in Spring Data 1. Overview In this quick article, we’ll focus on different kinds of Spring Data repository interfaces and their functionality. We’ll touch on: CrudRepository PagingAndSortingRepository JpaRepository Simply put, every repository in Spring Data extends the generic Repository interface, but beyond that, they do each… Continue Reading spring-data-repositories

A Guide to SqlResultSetMapping 1. Introduction In this guide, we’ll take a look at SqlResultSetMapping, out of the Java Persistence API (JPA). The core functionality here involves mapping result sets from database SQL statements into Java objects. 2. Setup Before we look at its usage, let’s do some setup. 2.1. Maven Dependency… Continue Reading jpa-sql-resultset-mapping

Pessimistic Locking in JPA 1. Overview There are plenty of situations when we want to retrieve data from a database. Sometimes we want to lock it for ourselves for further processing so nobody else can interrupt our actions. We can think of two concurrency control mechanisms which allow us to… Continue Reading jpa-pessimistic-locking