querydsl | The Blog Pros

June 15, 2021

Understanding JPA and Other Query Construction Frameworks

JPA is the standard that guides the developer towards an object conceptualization of his application and provides him with an abstraction of the relational model. However, once the model is in place, several frameworks are available to generate the request or the command. Which choices are the most relevant? Let's explore.

Criteria JPA2

Once your dependencies are added, the Criteria API is immediately available. It is the most basic and requires knowing the API and its subtleties to produce requests. The use of these objects obliges to pass directly in character string the name of the attributes in order to impose restrictions. Errors are therefore quite frequent during development and during refactoring operations. Plus, because these errors happen at run time, they are often caught too late.

April 18, 2021

Spring Data JPA + QueryDSL: Taking the Best From Both Worlds

You can find the full project on GitHub using this link. There is a simple SpringBoot application with configured MySQL data source and initial database structure described as a Flyway migration.

Here we will concentrate only on the building persistence layer. As we deal with the relational database we will rely on the JPA specification. Let’s take a simple entity model like Author/Book as an example:

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