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Q:

mysql - PHP Mysqli update Where IN from serialize ajax post get variables in array

Hey everyone,

I'm currently working on a project and I've run into a bit of a problem. I'm trying to update multiple rows in a MySQL database using the PHP Mysqli extension. The data I want to update is coming from an AJAX POST request, which I have serialized and stored in an array.

Now, here's my issue - I'm not sure how to write the UPDATE query using the WHERE IN clause to update the rows that match the values in my serialized array. I know I need to use the unserialize function to convert the array back to its original form.

Can anyone here help me out with this? It would be greatly appreciated. Thank you in advance!

All Replies

kaela.skiles

Hey there,

I had a similar requirement not too long ago, where I needed to update multiple rows based on values received through an AJAX POST request. It took me a bit of trial and error, but I managed to figure it out. Here's how I approached it:

Firstly, I ensured that I properly serialized the data before sending it through the AJAX request. And on the PHP side, I used the unserialize function to convert it back into an array. You've got that part covered, so well done!

To update the rows using the WHERE IN clause, you'll need to construct your query dynamically based on the values in the array. Here's how I did it:

php
// Assuming your array is named $data
$serializedData = implode(',', $data);
// Assuming your table name is 'my_table' and the column you're updating is 'my_column'
$query = "UPDATE my_table SET my_column = 'new value' WHERE my_column IN ($serializedData)";


Make sure to adjust the table name, column name, and update value to match your specific scenario.

Finally, execute the query using PHP Mysqli's `query()` function:

php
$result = $connection->query($query);


That should do the trick! Just be cautious of the values in your array. If they contain any special characters, make sure to sanitize them properly to prevent any potential SQL injections.

I hope this helps! Let me know if you have any further questions.

max62

Hey everyone,

I recently went through a similar situation where I needed to update multiple rows based on serialized data received from an AJAX POST request. However, I took a slightly different approach that worked well for my scenario.

Instead of using the WHERE IN clause, I decided to loop through the deserialized array and run individual update queries for each value. Although it may not be the most efficient solution for large arrays, it provided more flexibility in my case. Here's what I did:

php
// Assuming your serialized array is named $serializedData
$deserializedData = unserialize($serializedData);
// Assuming your table name is 'my_table' and the column you're updating is 'my_column'
$column = "my_column";
$newValue = "new value";

foreach ($deserializedData as $value) {
$query = "UPDATE my_table SET $column = '$newValue' WHERE $column = ?";
$stmt = $connection->prepare($query);
$stmt->bind_param('s', $value);
$stmt->execute();
}

$stmt->close();


This approach allows you to update each row individually based on the values in the array. However, it's worth noting that if you have a large number of rows to update, using the WHERE IN clause with prepared statements, as mentioned in previous responses, might be more efficient.

I hope this alternative approach gives you some additional perspective. Feel free to ask if you have any further questions. Good luck with your project!

mafalda.boyle

Hey there!

I faced a similar challenge recently and found a slightly different approach to update rows using the WHERE IN clause with serialized data from an AJAX POST request.

Instead of directly using the serialized array in the query, I opted to use prepared statements for better security and scalability. Here's how I accomplished it:

First, deserialize the array received from the AJAX request using the unserialize function. Then, construct a placeholder string for the prepared statement based on the number of elements in the array. Here's an example:

php
// Assuming your serialized array is named $serializedData
$deserializedData = unserialize($serializedData);

// Create the placeholder string
$placeholders = implode(',', array_fill(0, count($deserializedData), '?'));

// Assuming your table name is 'my_table' and the column you're updating is 'my_column'
$query = "UPDATE my_table SET my_column = 'new value' WHERE my_column IN ($placeholders)";


Next, prepare the statement and bind the values from the deserialized array to the placeholders. Here's an example:

php
$stmt = $connection->prepare($query);

// Bind the values from the deserialized array to the placeholders
$stmt->bind_param(str_repeat('s', count($deserializedData)), ...$deserializedData);


Finally, execute the prepared statement:

php
$stmt->execute();


This approach not only provides an extra layer of security against SQL injection but also allows for easy scalability when dealing with larger arrays.

Give it a try and let me know if you have any further questions. Good luck with your project!

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