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<?php
/**
* @file
* Install, update and uninstall functions for the mysql module.
*/
use Drupal\Core\Database\Database;
use Drupal\Core\Render\Markup;
/**
* Implements hook_requirements().
*/
function mysql_requirements($phase): array {
$requirements = [];
if ($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 = $connection->isMariaDb() ? 'SELECT @@SESSION.tx_isolation' : 'SELECT @@SESSION.transaction_isolation';
$isolation_level = $connection->query($query)->fetchField();
$tables_missing_primary_key = [];
$tables = $connection->schema()->findTables('%');
foreach ($tables as $table) {
$primary_key_column = Database::getConnection()->query("SHOW KEYS FROM {" . $table . "} WHERE Key_name = 'PRIMARY'")->fetchAllAssoc('Column_name');
if (empty($primary_key_column)) {
$tables_missing_primary_key[] = $table;
}
}
$description = [];
if ($isolation_level == 'READ-COMMITTED') {
if (empty($tables_missing_primary_key)) {
$severity_level = REQUIREMENT_OK;
}
else {
$severity_level = REQUIREMENT_ERROR;
}
}
else {
if ($isolation_level == 'REPEATABLE-READ') {
$severity_level = REQUIREMENT_WARNING;
}
else {
$severity_level = REQUIREMENT_ERROR;
$description[] = t('This is not supported by Drupal.');
}
$description[] = t('The recommended level for Drupal is "READ COMMITTED".');
}
if (!empty($tables_missing_primary_key)) {
$description[] = t('For this to work correctly, all tables must have a primary key. The following table(s) do not have a primary key: @tables.', ['@tables' => implode(', ', $tables_missing_primary_key)]);
}
$description[] = t('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',
]);
$requirements['mysql_transaction_level'] = [
'title' => t('Transaction isolation level'),
'severity' => $severity_level,
'value' => $isolation_level,
'description' => Markup::create(implode(' ', $description)),
];
}
}
return $requirements;
}
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