Spring Boot Data JPA: Using Criteria Queries with Hibernate - Step by Step Guide

If you're using Spring Boot Data JPA and Hibernate as your ORM, you may find yourself needing to perform more complex queries than what can be achieved with simple queries. This is where Criteria Queries come in handy.

Criteria Queries allow you to build queries programmatically rather than using strings, which makes them more type-safe and less error-prone. In this step-by-step guide, we'll show you how to use Criteria Queries with Hibernate in your Spring Boot Data JPA project.

Step 1: Add Dependencies
First, you'll need to add the necessary dependencies to your project's pom.xml file:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>5.4.18.Final</version>
</dependency>

Step 2: Create Criteria Query
Next, you'll need to create a Criteria Query object and specify the entity you want to query:

CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<YourEntity> query = builder.createQuery(YourEntity.class);
Root<YourEntity> root = query.from(YourEntity.class);

Step 3: Add Predicates
Now you can add predicates to your Criteria Query to filter the results:

Predicate predicate = builder.and(
    builder.like(root.get("name"), "%John%"),
    builder.greaterThan(root.get("age"), 25)
);
query.where(predicate);

This query will select all YourEntity objects where the name contains "John" and the age is greater than 25.

Step 4: Execute Query
Finally, you can execute the Criteria Query and retrieve the results:

List<YourEntity> results = entityManager.createQuery(query).getResultList();

And that's it! You've successfully used Criteria Queries with Hibernate in your Spring Boot Data JPA project. By using Criteria Queries, you can build more complex queries in a type-safe and less error-prone way.

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