Resolving the mysqli_sql_exception

Описание: Learn how to effectively resolve the `mysqli_sql_exception -1064` error in CodeIgniter 4 when attempting to retrieve data from the view.
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This video is based on the question https://stackoverflow.com/q/70489885/ asked by the user 'Yeasher Arafath' ( https://stackoverflow.com/u/8807576/ ) and on the answer https://stackoverflow.com/a/70495675/ provided by the user 'Ergec' ( https://stackoverflow.com/u/153723/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the mysqli_sql_exception -1064 Error in CodeIgniter 4 Views

It's not uncommon to encounter errors while developing web applications with frameworks like CodeIgniter 4. One such frustrating error is the mysqli_sql_exception -1064, which often occurs when attempting to utilize functions defined in the controller from within the view. This guide aims to clarify this issue and provide a detailed solution to prevent any further frustrations.

Understanding the Error

The error message you might receive looks something like this:

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

This is a SQL syntax error that indicates there's something wrong in how you're attempting to query the database, particularly in the context of your view.

Problem Breakdown

To break down the problem, let’s first look at the implementation across the different parts of your CodeIgniter application:

In Controller (MyData.php): You have a function get_data() which retrieves data based on the provided status argument.

In Model (MyData.php): The get_data() method here fetches records matching the status from the database.

In View (MyData.php): The view code attempts to fetch the same data using the controller’s get_data() method directly, which is fundamentally incorrect.

Solution Steps

To resolve this issue, you need to ensure that your view does not attempt to execute SQL queries directly. Instead, you should pass the data retrieved from the controller to the view. Here's how to adjust your code effectively:

Step 1: Update the view_data() Function in Your Controller

Modify the view_data() method to store the data in a variable before passing it to the view. Your updated function will look like this:

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

Step 2: Update Your View

In your view file, simply loop through the $data array you've passed without trying to call get_data() again. Here’s an example of how you could display the data:

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

Key Takeaways

Do Not Execute SQL in Views: Views should be used solely for displaying data passed to them by the controller. This keeps the logic separate and adheres to the MVC (Model-View-Controller) pattern effectively.

Use the Controller for Data Retrieval: Always retrieve data in your controller and send it to the view, ensuring simplicity and clarity in your code structure.

Conclusion

By following these steps, you can effectively resolve the mysqli_sql_exception -1064 error in CodeIgniter 4 and maintain a clean separation of logic in your web application. This should lead to a smoother development experience and help you avoid similar issues in the future.

If you have any questions or further issues, feel free to reach out for assistance!