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use neverchange #1

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10 changes: 10 additions & 0 deletions package-lock.json
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1 change: 1 addition & 0 deletions package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
"@emotion/styled": "^11.13.0",
"@sqlite.org/sqlite-wasm": "^3.46.1-build2",
"framer-motion": "^11.3.31",
"neverchange": "^0.0.1",
"react": "^18.3.1",
"react-dom": "^18.3.1"
},
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167 changes: 45 additions & 122 deletions src/db.ts
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Original file line number Diff line number Diff line change
@@ -1,140 +1,65 @@
import { sqlite3Worker1Promiser } from '@sqlite.org/sqlite-wasm';

let dbPromise: Promise<(command: string, params: any) => Promise<any>> | null = null;
let dbId: string | null = null;

async function createInitialSchema(promiser: (command: string, params: any) => Promise<any>) {
await promiser('exec', {
sql: `
CREATE TABLE IF NOT EXISTS todos (
id INTEGER PRIMARY KEY AUTOINCREMENT,
text TEXT NOT NULL,
completed BOOLEAN NOT NULL DEFAULT 0
)
`,
dbId,
});
}

async function migrateDatabase(promiser: (command: string, params: any) => Promise<any>) {
try {
const tableInfo = await promiser('exec', {
sql: "PRAGMA table_info(todos)",
rowMode: 'object',
dbId,
});

// migration check
const deletedColumnExists = tableInfo.result.resultRows.some(
(row: any) => row.name === 'deleted'
);

if (!deletedColumnExists) {
await promiser('exec', {
sql: "ALTER TABLE todos ADD COLUMN deleted BOOLEAN NOT NULL DEFAULT 0",
dbId,
});
console.log('Migration completed: Added deleted column to todos table');
} else {
console.log('Migration not needed: deleted column already exists');
}
} catch (error) {
console.error('Migration failed:', error);
throw error;
}
}
// @ts-ignore
import { NeverChangeDB } from 'neverchange';

let db: any = null;
const DB_NAME = 'todo';
export async function initDb() {
if (dbPromise) return dbPromise;

dbPromise = new Promise(async (resolve, reject) => {
try {
console.log('Loading and initializing SQLite3 module...');

const promiser = await new Promise<unknown>((resolve) => {
const _promiser = sqlite3Worker1Promiser({
onready: () => resolve(_promiser),
});
}) as (command: string, params: any) => Promise<any>;

console.log('Done initializing. Opening database...');

// OPFS
let openResponse;
try {
openResponse = await promiser('open', {
filename: 'file:todo.sqlite3?vfs=opfs',
});
console.log('OPFS database opened:', openResponse.result.filename);
} catch (opfsError) {
console.warn('OPFS is not available, falling back to in-memory database:', opfsError);
openResponse = await promiser('open', {
filename: ':memory:',
});
console.log('In-memory database opened');
}

dbId = openResponse.result.dbId;

// create schema
await createInitialSchema(promiser);

// migration
await migrateDatabase(promiser);

console.log('Database initialized and migrated successfully');
resolve(promiser);
} catch (err) {
console.error('Failed to initialize or migrate database:', err);
reject(err);
}
});

return dbPromise;
if(db) db;

db = new NeverChangeDB(DB_NAME);

db.addMigrations([
{
version: 1,
up: async (db: any) => {
await db.execute(`
CREATE TABLE IF NOT EXISTS todos (
id INTEGER PRIMARY KEY AUTOINCREMENT,
text TEXT NOT NULL,
completed BOOLEAN NOT NULL DEFAULT 0
)
`);
},
},
{
version: 2,
up: async (db: any) => {
await db.execute(`
ALTER TABLE todos ADD COLUMN deleted BOOLEAN NOT NULL DEFAULT 0
`);
},
},
]);
await db.init();
}

export async function addTodo(text: string) {
const promiser = await initDb();
try {
await promiser('exec', {
sql: 'INSERT INTO todos (text) VALUES (?)',
bind: [text],
dbId,
});
await db.execute(
'INSERT INTO todos (text) VALUES (?)',
[text],
);
console.log('Todo added successfully');
} catch (error) {
console.error('Failed to add todo:', error);
}
}

export async function getTodos() {
const promiser = await initDb();
const result = await promiser('exec', {
sql: 'SELECT * FROM todos WHERE deleted = 0 ORDER BY id DESC',
rowMode: 'object',
dbId,
});
const { resultRows: rows } = result.result;
const rows = await db.query('SELECT * FROM todos WHERE deleted = 0 ORDER BY id DESC');
return rows || [];
}

export async function toggleTodo(id: number) {
const promiser = await initDb();
await promiser('exec', {
sql: 'UPDATE todos SET completed = NOT completed WHERE id = ?',
bind: [id],
dbId,
});
await db.execute(
'UPDATE todos SET completed = NOT completed WHERE id = ?',
[id]);
}

export async function updateTodo(id: number, text: string) {
const promiser = await initDb();
try {
await promiser('exec', {
sql: 'UPDATE todos SET text = ? WHERE id = ?',
bind: [text, id],
dbId,
});
await db.execute('UPDATE todos SET text = ? WHERE id = ?',
[text, id]);
console.log('Todo updated successfully');
} catch (error) {
console.error('Failed to update todo:', error);
Expand All @@ -143,13 +68,11 @@ export async function updateTodo(id: number, text: string) {
}

export async function deleteTodo(id: number) {
const promiser = await initDb();
try {
await promiser('exec', {
sql: 'UPDATE todos SET deleted = 1 WHERE id = ?',
bind: [id],
dbId,
});
await db.execute(
'UPDATE todos SET deleted = 1 WHERE id = ?',
[id],
);
console.log('Todo marked as deleted successfully');
} catch (error) {
console.error('Failed to mark todo as deleted:', error);
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