How to Insert Multiple Rows into PostgreSQL Using Java Spring WebFlux

Published: 05 October 2025
on channel: vlogize

A beginner's guide to inserting multiple rows into a PostgreSQL database using Java Spring WebFlux, complete with code examples and explanations.
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This video is based on the question https://stackoverflow.com/q/63826317/ asked by the user 'raf' ( https://stackoverflow.com/u/6404253/ ) and on the answer https://stackoverflow.com/a/63862199/ provided by the user 'Michael McFadyen' ( https://stackoverflow.com/u/3047038/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Insert Multiple Rows into PostgreSQL Using Java Spring WebFlux

Are you new to Spring WebFlux and struggling with how to insert multiple rows into a PostgreSQL database? You’re not alone! Developing a REST API that interacts with a database can be overwhelming, especially when you're dealing with reactive programming paradigms. In this post, we’ll explore how to effectively insert multiple rows into your database using Java Spring WebFlux. You'll learn the importance of using Flux and the best methods to achieve this functionality.

Understanding the Problem

Background

In the context of building a REST API, you may have a scenario where you need to insert multiple data entries simultaneously. For example, you may want to save multiple file uploads, each with their respective attributes. A typical method to achieve this would be to send a JSON array as the request body.

Sample JSON Input

Here’s an example of how you might format the data for file uploads in JSON:

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

Once you’ve set up your JSON, the next step is to handle the insertion logic in your Spring WebFlux application.

Crafting the Solution

Step 1: Implementing the Service Layer

You need a service method that can accept a Flux of the file uploads and then save each file upload to the database. Here’s how you could implement the method using Spring Data’s ReactiveCrudRepository:

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

In this code snippet, the saveAll method provided by the ReactiveCrudRepository takes a Publisher of FileUpload objects and handles the saving to the database asynchronously. This is a powerful feature of Spring Data that optimizes handling multiple records at once.

Step 2: Creating the Controller

Next, you need to expose a REST endpoint that will accept these multiple file uploads. Here’s how you can do this using a RestController:

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

Here, we use @ RequestBody to directly accept a Flux of FileUpload. This simplifies the processing and leverages the strengths of reactive programming.

Step 3: Testing the Endpoint

Now that you have your service and controller set up, you can test the endpoint using tools like Postman. Set your request type to POST, enter your JSON data, and hit the endpoint. If set up correctly, each file upload contained in your JSON array should be saved to the PostgreSQL database.

Conclusion

By utilizing the capabilities of Flux in Spring WebFlux and employing the methods provided by ReactiveCrudRepository, you can efficiently insert multiple rows into your PostgreSQL database. This approach not only enhances performance but also simplifies your code execution logic.

If you're new to these concepts, keep experimenting with the examples provided, and you'll gain confidence in using Spring WebFlux for reactive programming. If you have any questions or need further clarification, feel free to ask in the comments!

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