简单存储数据
从本地存储走向真正的数据库
简单存储数据 是 CoddyKit 上的免费 Vibe Coding 课时。 这是第 3 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Vibe Coding 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Vibe Coding 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Data That Sticks Around
Most apps need to remember things: your to-do list, your saved notes, the dark-mode setting you chose. Without storage, everything disappears when you refresh the page.
The good news: you can go from 'remembers nothing' to 'remembers everything' just by describing what to save — AI handles the storage code.
The Storage Ladder
There are levels of storage, from simplest to most powerful. Start low and climb only when you need to:
- In memory — fast but forgotten on refresh
- Local storage — saved in the user's browser, survives refresh
- A database — shared across devices and users, the real deal
Telling AI which rung you want keeps your app as simple as possible.
Saving to the Browser
The easiest persistent storage is localStorage — a little notebook the browser keeps for your app. It's perfect for settings and small lists on a single device.
You don't need a server or account for this. A prompt like the one below adds it instantly.
Make my to-do list save to the browser's
localStorage so my tasks are still there after I
refresh the page. Load them automatically when the
page opens.How localStorage Works
localStorage stores text by a name (a 'key'). To save objects or lists, you turn them into JSON text first, then turn them back when reading.
Run this to see the pattern AI uses: save a value, then read it back.
const settings = { theme: 'dark', fontSize: 16 };
const saved = JSON.stringify(settings);
console.log('Saved text:', saved);
const loaded = JSON.parse(saved);
console.log('Theme is:', loaded.theme);When localStorage Isn't Enough
localStorage only lives in one browser on one device. If you want users to see their data on their phone and laptop, or share data between users, you need a database on a server.
That sounds scary, but tools make it easy. You'll describe what to store, and AI sets up the database calls.
Easy Databases for Vibe Coders
You don't need to run your own server. Hosted databases give you storage with almost no setup:
- Supabase — a friendly database with built-in login, great with AI tools
- Firebase — Google's real-time database
- Airtable — a spreadsheet that acts like a database
Builders like Bolt, Lovable and Replit can connect these for you when you ask.
Adding a Database by Prompt
To add real storage, describe what you're saving and where. Naming Supabase (a popular choice) tells AI exactly which setup to generate.
This prompt turns a local-only app into one with a shared, persistent database.
Connect this app to Supabase. Create a table called
notes with columns: id, title, content, and
created_at. Update the app so saving a note inserts
a row, and the homepage loads all notes from the
table, newest first.Thinking in Tables
A database stores data in tables — like spreadsheets with named columns. A 'notes' table might have a title, content, and a date. Each saved note is one row.
You don't need to master database design. Just tell AI what fields each thing has, and it builds the table for you.
Create, Read, Update, Delete
Almost every data app does four things, nicknamed CRUD: Create new items, Read them back, Update them, and Delete them. If your app can do all four, it's a real tool.
You can ask AI to add them one at a time, testing each before moving on.
Add full editing to my notes app: I should be able
to create a note, edit an existing note's title and
content, and delete a note with a confirm dialog.
Keep everything saved to Supabase.Start Simple, Upgrade Later
The pro move is to start at the lowest rung that works. Building a quick prototype? localStorage. Need it on every device? Move up to a database. AI can even migrate you — 'switch my app from localStorage to Supabase.'
Don't over-engineer early. Match the storage to what your app actually needs today.
My app currently uses localStorage. Migrate it to
use Supabase instead so my data syncs across
devices, and move any existing local data into the
database on first load.Backups and Not Losing Data
Data is precious — users get upset if it vanishes. Hosted databases like Supabase and Firebase keep backups for you, which is another reason to graduate from localStorage for anything important.
You can also let users export their own data as a safety net. Ask AI to add a one-click backup so nobody loses their work.
Add a "Download backup" button that exports all my
notes from the database as a JSON file, and an
"Import backup" option that restores them. This
way users never lose their data.Quick Check
You built a notes app that uses the browser's localStorage. A user complains they can't see their notes when they open the app on their phone. What kind of storage do they actually need?
Recap: Storing Data Simply
You learned the storage ladder: in-memory, then localStorage for single-device persistence, then a real database for cross-device, shared data.
You saw how to save settings in the browser, when to upgrade to hosted databases like Supabase, how data lives in tables, and the CRUD actions every data app needs. Start simple and let AI upgrade you. Next: keeping your API keys and secrets safe.
常见问题解答
「简单存储数据」课时是免费的吗？
是的 — 「简单存储数据」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Vibe Coding 课程的其余内容，请升级到 CoddyKit PRO。 Vibe Coding 课程共包含 4 节课。
「简单存储数据」这节课中我会学到什么？
从本地存储走向真正的数据库 你通过在浏览器中直接运行的动手代码来练习 Vibe Coding，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Vibe Coding 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Vibe Coding 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 3 节课，共 4 节。
「简单存储数据」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Vibe Coding 课中编写并运行代码吗？
能。每节 Vibe Coding 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。