How to write JPA Criteria API queries using Codota

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Introduction

Writing JPA Criteria API queries is not very easy. The Codota IDE plugin can guide you on how to write such queries, which greatly simplifies the process.

In this article, we are going to see how Codota works and how it can help you discover a given API.

Codota

Codota is a free Java IDE plugin which you install on IntelliJ IDEA or Eclipse.

The plugin provides you with suggestions related to what methods to call for a given Java object reference. Behind the scenes, Codota uses AI to determine the most common way a given API is used. The suggestions are based on open-source projects that have been previously scanned by Codota.

JPA Criteria API

When using JPA and Hibernate, most of the time, you are either using JPQL or SQL. JPQL is useful when we want to fetch entities that we plan on modifying while native SQL allows you to take advantage of any feature offered by the underlying database.

With a JPQL or SQL query, the user has the possibility of varying the bind parameter values only. The user cannot change the query structure based on the parameters they provide from the user interface.

JPA also offers the possibility of building entity queries dynamically, meaning that we can vary the structure of the entity query based on the provided user input, and that’s exactly what Criteria API does.

Now, if you ever used the JPA Criteria API, you might have realized that the API is not very straightforward and writing a CriteriaQuery is not a trivial thing to do.

Codota can simplify the process of writing a Criteria API query as illustrated by the following screenshot:

Codota JPA CriteriaQuery

The first 5 entries in the code suggestion pop-up are provided by Codota, and those 5 entries are the most common methods called on a Root Java Object reference.

Video demonstration

If you want to see a demonstration of how Codota can simplify the process of writing JPA Criteria API queries, then check out the following YouTube video.

Cool, right?

Conclusion

While JPA Criteria is very useful when writing dynamic entity queries, unfortunately, the API is not very suggestive. Therefore, writing a Criteria API query can take more time than necessary.

With Codota, you can write JPA Criteria queries much faster since you are given suggestions based on what’s the most likely method that you should call at any given point.

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