Guide to Dynamic Queries in Spring Boot: Using JpaSpecificationExecutor, Specification & Criteria API for Advanced Filtering
Spring Data JPA provides a powerful way to build dynamic queries using the JpaSpecificationExecutor<T> interface along with the Specification API and Criteria API . This guide will walk you through how to use these features from scratch. 1. What is JpaSpecificationExecutor<T> ? JpaSpecificationExecutor<T> is an interface provided by Spring Data JPA that allows us to write dynamic and complex queries without manually crafting JPQL or native SQL. It works alongside the Specification API , which enables filtering data based on multiple criteria dynamically. Key Benefits : Dynamic Filtering : Build queries at runtime based on user input. Flexible Querying : Combine multiple conditions using AND / OR logic. Better Performance : Avoid fetching unnecessary data. Easier Maintenance : No need to write complex JPQL or native SQL. 2. Setting Up Spring Boot with Spring Data JPA Step 1: Add Dependencies Make sure you have the required dependencies in your pom.xml : < depe...