Issues with PHP PDO Transactions Not Rolling Back as Expected
I'm currently working on a PHP application where I'm using PDO to interact with MySQL. I have a scenario where I need to perform multiple database operations within a transaction. However, I noticed that even when an error occurs in one of the operations, the transaction does not roll back as expected. Here’s a snippet of the code I’m using: ```php try { $pdo = new PDO('mysql:host=localhost;dbname=my_database', 'username', 'password'); $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $pdo->beginTransaction(); // First operation $stmt1 = $pdo->prepare('INSERT INTO users (name) VALUES (:name)'); $stmt1->execute([':name' => 'John Doe']); // Second operation that fails $stmt2 = $pdo->prepare('INSERT INTO orders (user_id, amount) VALUES (:user_id, :amount)'); // Simulating an issue with user_id reference $stmt2->execute([':user_id' => 9999, ':amount' => 100]); // 9999 does not exist in users // If everything works, commit the transaction $pdo->commit(); } catch (PDOException $e) { // This is where I expect the rollback to happen echo 'Error: ' . $e->getMessage(); $pdo->rollBack(); } ``` From my understanding, when an exception is thrown, the catch block should execute, and the transaction should roll back. However, the data is still being inserted into the `users` table, and I am not seeing any indication that the transaction isn't working as intended. I also tried enabling the MySQL general query log to see what queries were actually being executed, and it shows that the first insert was successful before the second operation failed. I’ve confirmed that `PDO::ERRMODE_EXCEPTION` is set, so I should be seeing exceptions for database errors. Is there something I'm missing in the transaction handling, or could it be related to how the database connection is configured? Also, could this behavior relate to my MySQL version (5.7.30)? Any insights would be appreciated.