README.md

PHP DB Locker

Introduction

PHP application-level database locking mechanisms to implement concurrency control patterns.

Supported drivers:

• Postgres

Installation

Pull in the package through Composer.

composer require cybercog/php-db-locker

Usage

Postgres

Transaction-level advisory lock

$dbConnection = new PDO($dsn, $username, $password);

$postgresLocker = new PostgresAdvisoryLocker();
$postgresLockId = PostgresLockId::fromLockId(new LockId('user', '4'));

$dbConnection->beginTransaction();
$isLockAcquired = $postgresLocker->acquireLockWithinTransaction($dbConnection, $postgresLockId);
if ($isLockAcquired) {
    // Execute logic if lock was successful
} else {
    // Execute logic if lock acquisition has been failed
}
$dbConnection->commit();

Session-level advisory lock

$dbConnection = new PDO($dsn, $username, $password);

$postgresLocker = new PostgresAdvisoryLocker();
$postgresLockId = PostgresLockId::fromLockId(new LockId('user', '4'));

$isLockAcquired = $postgresLocker->acquireLock($dbConnection, $postgresLockId);
if ($isLockAcquired) {
    // Execute logic if lock was successful
} else {
    // Execute logic if lock acquisition has been failed
}
$postgresLocker->releaseLock($dbConnection, $postgresLockId);

Changelog

Detailed changes for each release are documented in the CHANGELOG.md.

License

• PHP DB Locker package is open-sourced software licensed under the MIT license by Anton Komarev.

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