How does Connection behave in multithreaded code?

In a multithreaded environment, the behavior of a Connection object can vary based on how it is managed. It is important to ensure that a Connection instance is not shared across multiple threads concurrently because most JDBC drivers do not support concurrent usage of a single Connection. Instead, you should use a connection pool that creates a separate Connection for each thread to avoid thread safety issues.

Using a connection pool, each thread can obtain a Connection object from the pool, use it to execute database operations, and then return it to the pool when done. This practice ensures that database connections are efficiently reused and properly managed, preventing potential connection leaks and increasing performance.

Here is an example demonstrating safe Connection usage in a multithreaded environment:


        <?php
        class Database {
            private $db;
            private $pool;
            
            public function __construct() {
                // Initialize connection pool
                $this->pool = new PDO('mysql:host=localhost;dbname=test', 'username', 'password');
            }
            
            public function getConnection() {
                // Get a connection from the pool
                return $this->pool;
            }
        }
        
        class WorkerThread extends Thread {
            private $db;

            public function __construct($db) {
                $this->db = $db;
            }

            public function run() {
                $connection = $this->db->getConnection();
                // Perform database operations
                // Example: $connection->query("SELECT * FROM table_name");
            }
        }
        
        $db = new Database();
        $threads = [];

        for ($i = 0; $i < 10; $i++) {
            $threads[] = new WorkerThread($db);
        }

        foreach ($threads as $thread) {
            $thread->start();
        }
        
        foreach ($threads as $thread) {
            $thread->join();
        }
        ?>

How does Connection behave in multithreaded code?

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How does Connection behave in multithreaded code?

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