php - pdo 获取总列数

Question

pdo 怎么获取总列数

$cols=mysql_num_fields($result);//总列数
$total=mysql_num_rows($result);//总条数

用pdo 怎么写

Answer 1

拼SQL语句啊.COUNT()

try{
        $pdo = new \PDO('mysql:dbname=test;host=localhost','root','');
        $pdo->exec('SET NAMES utf8 ');
        $stm = $pdo->query(' SELECT COUNT(*) FORM xxx ' );
        $data = $stmt->fetch( PDO::FETCH_NUM);
}catch(PDOException $e)
{
    die($e->getMessage());
}

Answer 2

$pdo = new PDO('mysql:test', 'root', '123456');
$count = $pdo->exec("select COUNT(1) FROM tables");