Fatal error: Uncaught Error: Undefined constant PDO::MYSQL_ATTR_USE_BUFFERED_QUERY in D:\inetpub\wwwroot\multisites\includes\database\mysql\database.inc:334
Stack trace:
#0 D:\inetpub\wwwroot\multisites\includes\database\database.inc(1796): DatabaseConnection_mysql->__construct()
#1 D:\inetpub\wwwroot\multisites\includes\database\database.inc(1582): Database::openConnection()
#2 D:\inetpub\wwwroot\multisites\includes\database\database.inc(2687): Database::getConnection()
#3 D:\inetpub\wwwroot\multisites\includes\cache.inc(359): db_escape_table()
#4 D:\inetpub\wwwroot\multisites\includes\cache.inc(340): DrupalDatabaseCache->getMultiple()
#5 D:\inetpub\wwwroot\multisites\includes\cache.inc(57): DrupalDatabaseCache->get()
#6 D:\inetpub\wwwroot\multisites\includes\module.inc(763): cache_get()
#7 D:\inetpub\wwwroot\multisites\includes\module.inc(963): module_implements()
#8 D:\inetpub\wwwroot\multisites\modules\system\system.module(2531): module_invoke_all()
#9 D:\inetpub\wwwroot\multisites\includes\theme.inc(798): _system_rebuild_theme_data()
#10 D:\inetpub\wwwroot\multisites\includes\theme.maintenance.inc(57): list_themes()
#11 D:\inetpub\wwwroot\multisites\includes\bootstrap.inc(2965): _drupal_maintenance_theme()
#12 D:\inetpub\wwwroot\multisites\includes\errors.inc(177): drupal_maintenance_theme()
#13 D:\inetpub\wwwroot\multisites\includes\bootstrap.inc(2690): _drupal_log_error()
#14 [internal function]: _drupal_exception_handler()
#15 {main}
thrown in D:\inetpub\wwwroot\multisites\includes\database\mysql\database.inc on line 334