Category: Tech Primers Tags: JPA, Spring Data JPA, CriteriaBuilder, Specification, Dynamic Queries Difficulty: Intermediate Estimated Read Time: 10-15 minutes 🧠 Introduction When building REST APIs, we often need to filter data based on various conditions — like searching users by name, email, or registration date. Writing separate queries for every combination can quickly become a nightmare. That’s where JPA Specifications and CriteriaBuilder come in! They allow us to build dynamic queries based on incoming parameters, without cluttering the codebase. In this primer, you’ll learn how to: • Use Spring Data JPA’s Specification interface. • Dynamically create queries using CriteriaBuilder. • Combine multiple filters cleanly. • Build a search API that takes flexible filtering options. 🛠 Prerequisites Before starting, ensure you have the following: • Basic knowledge of Spring Boot and Spring Data JPA. • A working Spring Boot project with JPA configured. • A database set up (e.g., H2, MySQL, PostgreSQL). @Entity public class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private String name; private String email; private String role; private LocalDate registrationDate; // Getters and Setters }
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