Скачать или смотреть Executing SQL Native Query for Multiple Entities with JPA and Hibernate

Learn how to execute complex native SQL queries across multiple entities using JPA and Hibernate in Spring Boot effectively.
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This video is based on the question https://stackoverflow.com/q/67930512/ asked by the user 'David Anwar' ( https://stackoverflow.com/u/13614189/ ) and on the answer https://stackoverflow.com/a/67930662/ provided by the user 'Vlad L' ( https://stackoverflow.com/u/14624235/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Execute SQL Native Query from Two Entities Using JPA or Hibernate

When working with databases in Java applications, especially using JPA (Java Persistence API) or Hibernate, you may sometimes encounter situations where you need to execute complex SQL queries interacting with multiple entities. This guide will guide you step-by-step to execute such a query, focusing on an example involving two related tables: salesOrder and salesOrderline.

The Problem

Suppose you manage an e-commerce platform, and you need to update customer reviews in your database. You have two tables:

salesOrder: Contains columns id, customerId, and textReview (boolean).

salesOrderline: Contains columns salesOrderId and productId.

Your task is to update the boolean column textReview to true for specific orders based on the provided customerId and productId. Initially, you have an SQL native query that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

However, you find it confusing to execute this query using JPA or Hibernate in a Spring Boot application.

Understanding the SQL Query

The SQL query you've provided has a logical flow, but it can be simplified. The proposed structure doesn't require nested SELECT statements. The refactored SQL will look like this:

[[See Video to Reveal this Text or Code Snippet]]

In this version, the logic is straightforward: you directly set textReview to true when the customerId matches and the salesOrderId exists in the salesOrderline for the given productId.

Executing SQL Native Query with JPA/Hibernate

To execute this SQL query using JPA or Hibernate within a Spring Boot application, follow these steps:

Step 1: Set up Your Repository

You need to create a custom repository interface that extends JpaRepository or CrudRepository. For example:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Create the Method to Execute the Native Query

In your service class, you can then create a method to execute the native query. Use the @ Modifying annotation for updating the database and the @ Query annotation to define your SQL statement:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Define the Native Query in Repository

Next, define the update query in the repository interface:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Trigger the Update Method

Now, you can call the updateTextReview method from your controller or any part of your application logic where you want to perform the update operation:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the outlined steps, you can effectively execute a native SQL query involving multiple entities using JPA and Hibernate. This approach not only simplifies your data manipulation tasks but also leverages Spring Boot's powerful features for maintaining transactional integrity and enhancing application performance.

Remember, while executing native queries might be necessary in some situations, it’s always best to consider using JPQL or the Criteria API when possible for better maintainability and readability.

With this knowledge, you should feel more confident in handling complex SQL interactions within your Java applications. Happy coding!