advanced patterns with PDO Transactions in PHP 8.1 on MySQL with InnoDB
I'm trying to configure I'm dealing with I'm trying to configure I'm working with an scenario with PDO transactions in PHP 8.1 when using MySQL with the InnoDB storage engine. My expectation is that if any part of the transaction fails, the entire transaction should roll back, but I’m seeing inconsistent behavior based on the operations being performed. Here’s a simple example of what I’m trying to achieve: ```php try { $pdo = new PDO('mysql:host=localhost;dbname=testdb', 'username', 'password'); $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $pdo->beginTransaction(); // First operation $stmt1 = $pdo->prepare('INSERT INTO users (name, email) VALUES (:name, :email)'); $stmt1->execute([':name' => 'John Doe', ':email' => 'john@example.com']); // Second operation that should unexpected result $stmt2 = $pdo->prepare('INSERT INTO users (name, email) VALUES (:name, :email)'); $stmt2->execute([':name' => 'Jane Doe', ':email' => 'john@example.com']); // Duplicate entry $pdo->commit(); } catch (Exception $e) { $pdo->rollBack(); echo "Failed: " . $e->getMessage(); } ``` In this snippet, the second insert should throw a `PDOException` due to a duplicate email entry. However, I noticed that while the exception is caught, the first insert also seems to continue in the database, despite the rollback being called. I checked the autocommit setting and confirmed that it is set to 0. I also ensured that the database connection is correctly established with the appropriate behavior mode. Is there something I’m overlooking with how transactions are managed in PDO, especially considering MySQL's behavior with InnoDB? Any insights on how to ensure that all operations within the transaction are properly rolled back would be greatly appreciated. I'm working on a CLI tool that needs to handle this. What's the best practice here? This is happening in both development and production on Ubuntu 22.04. I'd really appreciate any guidance on this.