php连接数据库脚本

<?php

class DB{

private $host;

private $username;

private $password;

private $database;

private $port;

private $conn;

//构造方法

function __construct($host='127.0.0.1',$username='root',$password='',$database='test',$port=3306)

{

    $this->host=$host;

    $this->username=$username;

    $this->password=$password;

    $this->database=$database;

    $this->port=$port;

    // echo "建立连接<br/>";

    // 调用连接函数

    $this->connection();

}

// 连接函数

private function connection(){

    // 给连接变量赋值，并建立连接

    $this->conn=mysqli_connect($this->host,$this->username,$this->password,$this->database,$this->port) ;

    mysqli_query($this->conn,"set names utf8");

   

}

// 查询函数

function query($sql){

$result=mysqli_query($this->conn,$sql);

$rows=mysqli_fetch_all($result);

// foreach ($rows as $r){

//     echo "<br/>";

//     foreach($r as $v){

//         echo "$v ";

//     }

// }

    return $rows;

}

function Update($sql){

    $result=mysqli_query($this->conn,$sql);

   

    // print($result);

    // if($result == 1){

    //     print("更新成功");

    // }

    // else{

    //     print("更新失败");

    // }

}

 

function __destruct()

{

    mysqli_close($this->conn);

}

 

}