9- The **client-side entrypoint** is `/frontend/index.html`, which in turn imports `/frontend/index.tsx`, which in turn imports the React app from `/frontend/components/App.tsx`.
10
11[React Hono Example](https://www.val.town/x/stevekrouse/reactHonoExample) is a fuller featured example project, with a SQLite database table, queries, client-side CSS and a favicon, and some shared code that runs on both client and server.
4
5* `index.ts` - this is the **entrypoint** for this whole project
6* `database/` - this contains the code for interfacing with the app's SQLite database table
7
8## Hono
26## CRUD API Routes
27
28This app has two CRUD API routes: for reading and inserting into the messages table. They both speak JSON, which is standard. They import their functions from `/backend/database/queries.ts`. These routes are called from the React app to refresh and update data.
29
30## Errors
1# Database
2
3This app uses [Val Town SQLite](https://docs.val.town/std/sqlite/) to manage data. Every Val Town account comes with a free SQLite database, hosted on [Turso](https://turso.tech/). This folder is broken up into two files:
4
5* `migrations.ts` - code to set up the database tables the app needs
6* `queries.ts` - functions to run queries against those tables, which are imported and used in the main Hono server in `/backend/index.ts`
7
8## Migrations
9
10In `backend/database/migrations.ts`, this app creates a new SQLite table `reactHonoStarter_messages` to store messages.
11
12This "migration" runs once on every app startup because it's imported in `index.ts`. You can comment this line out for a slight (30ms) performance improvement on cold starts. It's left in so that users who fork this project will have the migration run correctly.
13
14SQLite has much more limited support for altering existing tables as compared to other databases. Often it's easier to create new tables with the schema you want, and then copy the data over. Happily LLMs are quite good at those sort of database operations, but please reach out in the [Val Town Discord](https://discord.com/invite/dHv45uN5RY) if you need help.
15
16## Queries
17
18The queries file is where running the migrations happen in this app. It'd also be reasonable for that to happen in index.ts, or as is said above, for that line to be commented out, and only run when actual changes are made to your database schema.
19
20The queries file exports functions to get and write data. It relies on shared types and data imported from the `/shared` directory.
3import { createTables, tableName } from "./migrations.ts";
4
5// This will create the database table if it doesn't exist.
6// This will run every time the app starts up. You can
7// comment out this line for a modest (30ms) perforamnce improvement
8// on cold starts. It's left in to ensure the database tables are
9// automatically set up correctly for users who fork this app.
10await createTables();
13
14 However, you should know that SQLite has much more limited
15 support for altering existing tables as compared to other databases.
16 Often it's easier to create new tables with the schema you want, and then
17 copy the data over. */
2import { readFile, servePublicFile } from "https://esm.town/v/stevekrouse/utils@187-main/serve-public/index.ts";
3import { Hono } from "npm:hono";
4import { getMessages, insertMessage } from "./database/queries.ts";
5
6const app = new Hono();
9- The **client-side entrypoint** is `/frontend/index.html`, which in turn imports `/frontend/index.tsx`, which in turn imports the React app from `/frontend/App.tsx`.
10
11[React Hono Example](https://www.val.town/x/stevekrouse/reactHonoExample) is a fuller featured example project, with a SQLite database table, queries, client-side CSS and a favicon, and some shared code that runs on both client and server.
98}
99
100// Initialize database for the entire project
101async function initializeDatabase() {
102 console.log("Initializing database...");
103 const SCHEMA_VERSION = 1;
104
112 )
113 `);
114 console.log("Database initialized successfully");
115
116 return { sqlite, SCHEMA_VERSION };
117 } catch (error) {
118 console.error("Database initialization error:", error);
119 throw error;
120 }
249
250 try {
251 // Initialize database
252 const { sqlite, SCHEMA_VERSION } = await initializeDatabase();
253
254 // Update user record if logged in
9- The **client-side entrypoint** is `/frontend/index.html`, which in turn imports `/frontend/index.tsx`, which in turn imports the React app from `/frontend/components/App.tsx`.
10
11[React Hono Example](https://www.val.town/x/stevekrouse/reactHonoExample) is a fuller featured example project, with a SQLite database table, queries, client-side CSS and a favicon, and some shared code that runs on both client and server.
268 * SQLite schema initialization
269 */
270async function initializeDatabase() {
271 const { sqlite } = await import("https://esm.town/v/stevekrouse/sqlite");
272 const SCHEMA_VERSION = 1;
338 console.log(`Path: ${path}`);
339
340 // Initialize database
341 const { sqlite, SCHEMA_VERSION, tablePrefix } = await initializeDatabase();
342
343 // Update user record if logged in