//使用PDO连接mysql数据库

<?php//使用PDO连接mysql数据库class pdo_con{ var $dsn = 'mysql:dbname=test; host:127.0.0.1'; var $user = 'root'; var $password = ''; var $opt = array(PDO::ATTR_PERSISTENT=>true); var $dbh; function __construct(){ try{ $this->dbh = new PDO($this->dsn,$this->user,$this->password,$this->opt); //面向对象 构造方法传值this //var_dump($dbh);die();
}catch(PDOException $e){ echo '数据库连接失败：'.$e->getMessage(); exit; } }

// $rs = $dbh->query('select * from user');// var_dump($pdostatement->rowCount());die(); // var_dump($rs);

// echo "\nPDO是否关闭自动提交功能：".$dbh->getAttribute(PDO::ATTR_AUTOCOMMIT); // echo "\n当前PDO的错误处理的模式：".$dbh->getAttribute(PDO::ATTR_ERRMODE); // echo "\n表字段字符的大小写转换：".$dbh->getAttribute(PDO::ATTR_CASE); // echo "\n与连接状态相关特有信息：".$dbh->getAttribute(PDO::ATTR_CONNECTION_STATUS); // echo "\n空字符串转换为sql的NULL：".$dbh->getAttribute(PDO::ATTR_ORACLE_NULLS); // echo "\n应用程序提前获取数据大小：".$dbh->getAttribute(PDO::ATTR_PERSISTENT); // echo "\n数据库特有的服务器信息：".$dbh->getAttribute(PDO::ATTR_SERVER_INFO); // echo "\n数据库服务器版本信息：".$dbh->getAttribute(PDO::ATTR_SERVER_VERSION); // echo "\n数据库客户端版本号信息：".$dbh->getAttribute(PDO::ATTR_CLIENT_VERSION); // echo "\n设置抛出异常处理错误：".$dbh->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION); // echo "\n设置空字符串为null：".$dbh->setAttribute(PDO::ATTR_ORACLE_NULLS,true);

function select($table,$where='',$order='',$limits='',$field=''){ $where = ($where==null)?'':' WHERE '.$where; $order = ($order==null)?'':' ORDER BY '.$order; $limits = ($limits==null)?'':' limit '.$limits; $field = ($field==null)?'*':$field; $sele = 'SELECT '.$field.' FROM '.$table.$where.$order.$limits.';'; $kk=$this->dbh->query($sele); $kk->setFetchMode(PDO::FETCH_ASSOC); //设置fetch在查询语句后面 return $kk; }

}
$ss=new pdo_con();// var_dump($ss); $rs = $ss->select('user'); foreach ($rs as $value) { # code... var_dump($value); // echo $value['username']; echo '<br>';}

来自为知笔记(Wiz)