1 files changed, 0 insertions, 78 deletions
diff --git a/core/modules/mysqli/mysqli.install b/core/modules/mysqli/mysqli.install
deleted file mode 100644
index 7f1147d63adb..000000000000
--- a/core/modules/mysqli/mysqli.install
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-
-/**
- * @file
- * Install, update and uninstall functions for the mysqli module.
- */
-
-use Drupal\Core\Database\Database;
-use Drupal\Core\Extension\Requirement\RequirementSeverity;
-use Drupal\Core\Render\Markup;
-
-/**
- * Implements hook_requirements().
- */
-function mysqli_requirements($phase): array {
-  $requirements = [];
-
-  if ($phase === 'runtime') {
-    // Test with MySql databases.
-    if (Database::isActiveConnection()) {
-      $connection = Database::getConnection();
-      // Only show requirements when MySQLi is the default database connection.
-      if (!($connection->driver() === 'mysqli' && $connection->getProvider() === 'mysqli')) {
-        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 = RequirementSeverity::OK;
-        }
-        else {
-          $severity_level = RequirementSeverity::Error;
-        }
-      }
-      else {
-        if ($isolation_level == 'REPEATABLE-READ') {
-          $severity_level = RequirementSeverity::Warning;
-        }
-        else {
-          $severity_level = RequirementSeverity::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;
-}