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熊掌小程序开荒记 02|正式上手敲代码!真正实现数据增删改查

  • 2026-09-25 00:55:20
熊掌小程序开荒记 02|正式上手敲代码!真正实现数据增删改查
大家好,欢迎回到熊掌小程序开荒记第 02 篇!
上一篇我们完成全部前置准备:在微信公众平台注册小程序账号、拿到 AppID、安装开发者工具,成功初始化空白项目。相信不少小伙伴已经搭建好开发环境,等着正式敲代码实战。
很多新手装好开发工具之后,盯着一堆文件无从下手,不知道怎么写页面、怎么存储数据。这一期我们跳过枯燥理论,直接实操:编写首页布局、开通云开发、搭建数据库,最终完成基础的数据增删改查,做出第一个可以正常运行的小程序功能。

第一步:首页页面布局,吃透 WXML + WXSS 基础语法

打开我们上一期创建好的小程序项目,找到首页核心文件index.wxml和index.wxss。

简单回顾一下哈:

WXML:页面结构,相当于网页 HTML,负责摆放文字、按钮、容器等;

WXSS:页面样式,相当于网页 CSS,控制颜色、间距、排版等。

1. 编写基础页面结构 index.wxml

<!--index.wxml --><viewclass="container">  <viewclass="title">我的首个小程序页面</view>  <viewclass="content">    <text>云开发数据演示</text>  </view>  <buttonbindtap="addData">新增数据</button>  <buttonbindtap="queryData">查询数据</button>  <buttonbindtap="updateData">修改数据</button>  <buttonbindtap="delData">删除数据</button></view>

2. 添加页面样式 index.wxss

/*index.wxss*/.container{  padding:30rpx;}.title{  font-size:36rpx;  font-weight:bold;  text-align:center;  margin:40rpx 0;}button{  margin:20rpx 0;}
保存文件,模拟器立刻实时预览效果,你就能看到简易页面和四个功能按钮。

💡新手小贴士:小程序统一使用 rpx 单位自适应手机屏幕,不要直接使用 px!

第二步:公众号后台开通云开发 TCB

很多同学纠结服务器、后端怎么搭建个人开发者优先选择微信云开发 TCB,无需购买服务器、不用配置域名,开箱即用。

1.登录小程序后台(mp.weixin.qq.com),侧边栏找到【云开发】;

2.点击开通,选择免费环境

(个人学习完全够用);

3.设置环境名称,等待环境初始化完成;

4.复制你的环境ID,后续代码需要填写。

需要填写。

!!!重要提醒:开通环境之后,回到微信开发者工具,在项目配置里填写云开发环境 ID,才能正常调用数据库。

第三步:创建云开发数据库集合

  1. 进入云开发控制台,选择【数据库】;
  2. 点击【+创建集合】,自定义集合名词(示例:demo-one);
  3. 进入集合权限设置,考试阶段可以临时调整权限:所有用户可读,仅创建者客服写;

⚠️正式上线务必收紧权限,避免数据被恶意篡改!

第四步:编写 JS 代码,实现数据增删改查

打开index.js,在页面生命周期 onLoad 上方编写数据库操作方法,替换代码:
//index.jsconst db = wx.cloud.database()Page({  data:{  },  //新增数据  addData(){    db.collection('demo-one').add({      data:{        name:"第一条测试数据",        time:new Date()      },      success:res=>{        wx.showToast({title:"新增成功"})        console.log("新增id",res._id)      }    })  },  //查询数据  queryData(){    db.collection('demo-one').get({      success:res=>{        console.log("查询结果",res.data)        wx.showToast({title:"查询完成,查看控制台"})      }    })  },  //修改数据  updateData(){    //把此处_id替换成你数据库真实的数据ID    db.collection('demo-one').doc("填入数据_id").update({      data:{        name:"修改之后的数据"      },      success:res=>{        wx.showToast({title:"修改成功"})      }    })  },  //删除数据  delData(){    //把此处_id替换成你数据库真实的数据ID    db.collection('demo-one').doc("填入数据_id").remove({      success:res=>{        wx.showToast({title:"删除成功"})      }    })  }})

!!!给大家分享一个我自己也失误的地方!!!

在app.js必须加上云环境初始化代码

//app.jsApp({  onLaunch() {    // 填入你自己的云开发环境ID!!    wx.cloud.init({      env: "你的环境ID",      traceUser: true    })  }})
保存代码,点击模拟器上的按钮测试。点击新增,刷新云开发数据库集合,就能看到我们通过前端写入的数据!到这里,你已经完成小程序最核心的前后端交互。

总结

  1. 使用 WXML+WXSS 搭建首页界面,掌握小程序基础页面编写方式;
  2. 成功开通微信云开发 TCB,创建数据库集合;
  3. 实现数据库基础的新增、查询、修改、删除,打通小程序数据交互。
有不少新手分不清前端页面和数据库如何联动,其实逻辑很简单:页面负责展示与接收用户点击,云开发充当后端,负责数据存储。
下一篇开荒记,我们优化页面展示,把数据库获取到的数据渲染到页面列表,并且封装通用函数,优化代码结构。
如果你跟着操作遇到云开发报错、权限不足、代码运行失败等问题,直接评论区留言,我逐一解答。收藏文章方便实操查阅,转发给一同学习小程序开发的伙伴,我们持续实战!
#小程序开发#微信云开发#零基础小程序实战#编程实训
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  140. /www/wwwroot/g.sjds.net/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000629s ] mysql:host=172.18.0.4;port=3306;dbname=g_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001042s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000443s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000336s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000598s ]
  6. SELECT * FROM `set` [ RunTime:0.000264s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000784s ]
  8. SELECT * FROM `article` WHERE `id` = 459065 LIMIT 1 [ RunTime:0.000471s ]
  9. UPDATE `article` SET `lasttime` = 1790387657 WHERE `id` = 459065 [ RunTime:0.002826s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000382s ]
  11. SELECT * FROM `article` WHERE `id` < 459065 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000528s ]
  12. SELECT * FROM `article` WHERE `id` > 459065 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000360s ]
  13. SELECT * FROM `article` WHERE `id` < 459065 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000622s ]
  14. SELECT * FROM `article` WHERE `id` < 459065 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000680s ]
  15. SELECT * FROM `article` WHERE `id` < 459065 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000672s ]
0.089612s