PHP操作mysql类

<?php

class Mysql{

	//数据库连接句柄
	private $link;

	//返回结果集
	private $result;

	//返回查询数据
	private $data;

	//执行的SQL语句
	private $query;

	public function __construct(){
		$this->link = @new mysqli("127.0.0.1","root","chenshuo90909","frame");
		if($this->link->connect_errno > 0){
			echo "<meta charset='utf-8'>数据库连接失败！"; exit;
		}
		$this->link->set_charset("utf8");
	}

	//查询
	public function select($query){
		$this->result = $this->link->query($query);
		while($row = $this->result->fetch_assoc()){
			$this->data[] = $row;
		}
		$this->result->free();
		return $this->data;
		
	}

	//写入
	public function insert($query){
		$this->result = $this->link->query($query);
		return $this->result;
	}

	//获取最后一次添加记录的主键值
	public function insertid(){
		return $this->link->insert_id;
	}

	//修改
	public function update($query){
		$this->result = $this->link->query($query);
		return $this->result;
	}

	//删除
	public function delete($query){
		$this->result = $this->link->query($query);
		return $this->result;
	}

	//返回服务器端MySQl版本
	public function version(){
		return $this->link->server_info;
	}

	//返回数据库所属服务器信息
	public function hostinfo(){
		return $this->link->host_info;
	}

	//关闭mysql连接
	public function __destruct(){
		$this->link->close();
	}

}

?>