PHP数据库PDO连接

<?php
  try {
    $pdo = new PDO("mysql:host->127.0.0.1;dbname=yangbo","root","");
  }catch(PDOException $PDOException){
    echo "创建对象失败，数据库连接失败：<br />".$PDOException->getMessage();
    exit;
  }
  echo "创建对象成功，数据库连接成功";
?>

<?php
  try {
    $pdo = new PDO("mysql:host->127.0.0.1;dbname=yangbo","root","");
  }catch(PDOException $xx){
    echo "failed".$xx->getMessage();
    exit;
  }
  echo "success";
var_dump($pdo);
  echo "<br />PDO是否关闭自动提交功能：".$pdo->getAttribute(PDO::ATTR_AUTOCOMMIT);
  echo "<br />当前PDO的错误处理的模式：".$pdo->getAttribute(PDO::ATTR_ERRMODE);
  echo "<br />表字段字符的大小写转换：".$pdo->getAttribute(PDO::ATTR_CASE);

?>