$sql = "select * from tb_root";
$res = $pdo->prepare($sql);
//$res->exec();
$res->execute();
$num = $res->rowCount();用pdo获取某个表中记录的数目
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用pdo获取某个表中记录的数目
$sql = "select * from tb_root"; $res = $pdo->prepare($sql); //$res->exec(); $res...