php mysql pdo

<?php
header("Content-type:text/html; charset=utf8");

class Mysql{
	protected $mysql;
	
	function __construct(){
		$this->mysql=new PDO("mysql:host=localhost;dbname=mytest","root","root");
		if(!$this->mysql) { throw new Exception("Can't connect to Mysql");exit(0);}
		
		$this->mysql->query("set names utf8");
	}
	
	function  getItem($id){
		$result=$this->mysql->prepare("select * from table01 where id=:id");
		$result->bindParam(':id',$id,PDO::PARAM_INT);        //bindValue:不接受php参数
		$result->execute();
		
		$resultArray=array();
		while($row=$result->fetch(PDO::FETCH_ASSOC)){
			array_push($resultArray,array($row['number'],$row['name']));
		}
		
		return $resultArray;
	}
	
	function removeItem($name){
		$delete=$this->mysql->prepare("delete from table01 where name=:name");
		$delete->bindParam(':name',$name,PDO::PARAM_STR);
		$delete->execute();
		
		if($delete) return true;
		else return false;
	}
	
	function addItem($number,$name){
		$insert=$this->mysql->prepare("insert into table01(number,name) values (:number,:name)");
		$insert->bindParam(':number',$number,PDO::PARAM_INT);
		$insert->bindParam(':name',$name,PDO::PARAM_STR);
		$insert->execute();
		
		if($insert) return true;
		else return false;
	}
}
try{
	$mysql=new Mysql();
	//添加条目
    if($mysql->addItem(5,"five")) echo "addItem(5,'five') is success<br>";
    else echo "addItem(5,'five') is wrong<br>";
	
	//删除条目
	if($mysql->removeItem("five")) echo "removeItem('five') is success<br>";
	else echo "removeItem('five') is wrong<br>";
	
	//查找条目
	$result=$mysql->getItem(1);
	echo $result[0][0]."<br>".$result[0][1];
	
}catch(Exception $e){
	echo $e->getMessage()."<br>";
}

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