48 lines
1.8 KiB
PHP
48 lines
1.8 KiB
PHP
<?php
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/**
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* @file
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* Install, update and uninstall functions for the mysql module.
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*/
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use Drupal\Core\Database\Database;
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/**
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* Implements hook_requirements().
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*/
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function mysql_requirements($phase) {
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$requirements = [];
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if ($phase === 'runtime') {
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// Test with MySql databases.
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if (Database::isActiveConnection()) {
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$connection = Database::getConnection();
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// Only show requirements when MySQL is the default database connection.
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if (!($connection->driver() === 'mysql' && $connection->getProvider() === 'mysql')) {
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return [];
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}
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$query = 'SELECT @@SESSION.tx_isolation';
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// The database variable "tx_isolation" has been removed in MySQL v8.0 and
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// has been replaced by "transaction_isolation".
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// @see https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_tx_isolation
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if (!$connection->isMariaDb() && version_compare($connection->version(), '8.0.0-AnyName', '>')) {
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$query = 'SELECT @@SESSION.transaction_isolation';
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}
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$isolation_level = $connection->query($query)->fetchField();
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$requirements['mysql_transaction_level'] = [
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'title' => t('Database Isolation Level'),
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'severity' => $isolation_level === 'READ-COMMITTED' ? REQUIREMENT_OK : REQUIREMENT_WARNING,
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'value' => $isolation_level,
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'description' => t('For the best performance and to minimize locking issues, the READ-COMMITTED transaction isolation level is recommended. See the <a href=":performance_doc">setting MySQL transaction isolation level</a> page for more information.', [
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':performance_doc' => 'https://www.drupal.org/docs/system-requirements/setting-the-mysql-transaction-isolation-level',
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]),
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];
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}
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}
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return $requirements;
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}
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