PHP:pdo连接数据库获取分区名称及属性信息

//连接数据库
$dsn = 'mysql:host=139.*.*;dbname=topv;charset=utf8';
$user = 'topv';
$pass = 'topv1234!';
$db = new PDO($dsn, $user, $pass);

//获取分区名称及属性信息;
$sql = "SELECT partition_name part,partition_expression expr,partition_description descr,table_rows FROM INFORMATION_SCHEMA.partitions WHERE TABLE_SCHEMA = schema() AND TABLE_NAME = 'jk_data'";
$res = $db->query($sql);
$res->setFetchMode(PDO::FETCH_ASSOC);
$count = $res->rowCount();
$data = $res->fetchAll();
die(json_encode($data));