mysql.install
Same filename in other branches
Install, update and uninstall functions for the mysql module.
File
-
core/
modules/ mysql/ mysql.install
View source
<?php
/**
* @file
* Install, update and uninstall functions for the mysql module.
*/
use Drupal\Core\Database\Database;
/**
* Implements hook_requirements().
*/
function mysql_requirements($phase) {
$requirements = [];
if ($phase === 'runtime') {
// Test with MySql databases.
if (Database::isActiveConnection()) {
$connection = Database::getConnection();
// Only show requirements when MySQL is the default database connection.
if (!($connection->driver() === 'mysql' && $connection->getProvider() === 'mysql')) {
return [];
}
$query = 'SELECT @@SESSION.tx_isolation';
// The database variable "tx_isolation" has been removed in MySQL v8.0.3 and
// has been replaced by "transaction_isolation".
// @see https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_tx_isolation
// @see https://dev.mysql.com/doc/refman/8.0/en/added-deprecated-removed.html
if (!$connection->isMariaDb() && version_compare($connection->version(), '8.0.2-AnyName', '>')) {
$query = 'SELECT @@SESSION.transaction_isolation';
}
$isolation_level = $connection->query($query)
->fetchField();
$requirements['mysql_transaction_level'] = [
'title' => t('Database Isolation Level'),
'severity' => $isolation_level === 'READ-COMMITTED' ? REQUIREMENT_OK : REQUIREMENT_WARNING,
'value' => $isolation_level,
'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.', [
':performance_doc' => 'https://www.drupal.org/docs/system-requirements/setting-the-mysql-transaction-isolation-level',
]),
];
}
}
return $requirements;
}
Functions
Title | Deprecated | Summary |
---|---|---|
mysql_requirements | Implements hook_requirements(). |
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