微信小程序怎么连接到数据库

var app = getApp()
Page({
    onLoad: function () {
        wx.request({
            url: 'http://localhost', //服务器地址
            data: {
                name: 'bob'//请求参数
            },
            header: {
                'content-type': 'application/json'
            },
            success: function (res) {
                console.log(res.data)
            }
        })
    }
})

<?php
$name=$_GET["name"] ;//接收参数
$conn = mysqli_connect("localhost", "test","root","root");//连接MYSQL数据库
$sql = "SELECT name,age FROM xcx WHERE name=&#39;$name&#39;";//响应请求
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {// 输出小程序数组
    while($row = mysqli_fetch_assoc($result)) {
        echo json_encode($row);//将请求结果转换为json格式
    }
}
?>