How to Easily Display a BLOB Image from Oracle DB in Your React App

Описание: Learn how to view a `BLOB` image stored in Oracle DB within a React application with this step-by-step guide.
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This video is based on the question https://stackoverflow.com/q/77594003/ asked by the user 'Gado' ( https://stackoverflow.com/u/3543063/ ) and on the answer https://stackoverflow.com/a/77594946/ provided by the user 'traynor' ( https://stackoverflow.com/u/4321299/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Easily Display a BLOB Image from Oracle DB in Your React App

When building applications, handling images stored in databases can sometimes feel daunting, especially when it comes to images stored as Binary Large Objects (BLOBs). If you're working with a stack that includes Oracle DB, Node.js, and React, you might find yourself asking, how can I view a stored BLOB image in my React app? Let's dive into the issue and solve it step-by-step!

Understanding the Problem

In your scenario, you have a BLOB image stored within an Oracle database. Despite retrieving the image data in your component, you're struggling to render it properly on your webpage. The structure of the image data you received looks something like this:

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

The challenge lies in converting this binary data so that it can be viewed as an image in your React application.

Step-by-Step Guide to Displaying the BLOB Image

Step 1: Retrieve the Image Data

You likely have your data fetching logic set up with a hook like useGetUserAccountQuery. Here's how you typically get the user information, including the image data:

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

Step 2: Set Up State Management

Next, you need to manage the state within your component. Initialize the state for user and profileImage:

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

Step 3: Convert the BLOB Data

When you receive the image data, it will likely be in a format that needs conversion. Instead of passing the USER_IMAGE directly into a Blob, create a typed array using Uint8Array. Modify your useEffect like this:

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

Step 4: Render the Image in the Component

Finally, render the image using an <img> tag. Ensure the src is assigned to profileImage:

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

Conclusion

By following these steps, you can successfully display a BLOB image stored in an Oracle database within a React application. Remember, the essential part is converting the image data into a format that your app can render, specifically using Uint8Array to correctly format the binary data.

If you follow this guide, you should be able to overcome the hurdles of displaying BLOB images and enhance your application’s functionality significantly. Happy coding!