Скачать или смотреть How to Efficiently Delete Specific Rows from MySQL with PHP

Learn how to delete a specific row from a MySQL database using PHP, ensuring that each delete action corresponds to its intended row.
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This video is based on the question https://stackoverflow.com/q/62224181/ asked by the user 'DFLEX' ( https://stackoverflow.com/u/13021466/ ) and on the answer https://stackoverflow.com/a/62224627/ provided by the user 'cyborg86pl' ( https://stackoverflow.com/u/1413151/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Deleting Specific Rows from MySQL with PHP

When working with PHP and MySQL, it’s common to display data in tables that allow users to delete records. However, you may encounter a frustrating issue: delete actions may only affect the last row in the displayed dataset, rendering your delete buttons ineffective. In this post, we’ll explore how to resolve this issue by correctly structuring your HTML forms so that each delete button targets its specific row.

The Problem: Ineffective Delete Buttons

Imagine you have a web application that lists logs for a specific user. For each log, a delete button is generated, but upon clicking any delete button, only the last entry is actually deleted. This issue arises from incorrect handling of form tags when generating your HTML. Let’s break down the reasons for this behavior:

Single Form Tag: If you use one single <form> tag to encompass all buttons, only the final ID submission is captured when the form is submitted.

Input Overwriting: Multiple buttons in the same form lead to the input names being overridden. Therefore, regardless of which button is pressed, the last input value is the only one sent, typically the last log ID.

The Solution: Properly Structure Your Form Tags

To ensure each button works correctly and targets the intended log row for deletion, you must nest each delete button and its corresponding log ID in its own individual form. Here’s how you can fix the code:

Correct Code Example

Below, we’ll revise the code to include a separate form for each log entry, making it possible to capture the correct log ID upon deletion:

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

Key Changes Made

Individual Forms: Each log entry now has its own <form> tag. This allows each submit button to correspond specifically to its log entry.

Hidden Input: A hidden input field captures the unique log ID related to that individual entry. Each submit action now correctly targets the matching log.

Handling the Delete Action

The remainder of your PHP logic for deleting the row will remain unchanged:

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

In this code:

The prepared statement executes a DELETE command targeting the log ID passed via the GET request, now accurately identifying which log to remove.

Conclusion

By structuring your forms correctly and ensuring each delete button is paired with its corresponding log ID, you can effectively delete specific rows from your MySQL table. This approach not only enhances user experience by providing clear functionality, but it also showcases best practices in managing forms and data interactions with PHP and MySQL.

Now you’re equipped with the knowledge to allow users to manage their records efficiently. Feel free to follow along with these guidelines in your projects and witness the difference proper form management can make!