beginTransaction();//写SQL语句$sql="select * form Info";//执行SQL语句$a=$pdo->query($sql);//回滚事务//$pdo->RollBack();foreach($a as $v){ var_dump($v);}?> 特点二：
下午 prepare($sql);//执行预处理语句,执行成功返回true，失败返回falseif($stm->execute()){ var_dump($stm->fetch());}?> prepare($sql);//绑定参数,数据较少的数据库,太复杂 不推荐$stm->bindParam(1,$code);$stm->bindParam(2,$name);//给变量赋值$code="n030";$name="壮族";//执行预处理语句,执行成功返回true，失败返回falseif($stm->execute());{ var_dump($stm->fetch());}?> prepare($sql);$attr=array("n005","苗族");//执行预处理语句,执行成功返回true，失败返回falseif($stm->execute($attr));{}?> prepare($sql);$attr=array("code"=>"n007","name"=>"水族");//执行预处理语句,执行成功返回true，失败返回falseif($stm->execute($attr));{}?>