import Npm from "@mdx/Npm.astro"; import Callout from '@mdx/Callout.astro'; import AnchorCards from '@mdx/AnchorCards.astro'; import Steps from '@mdx/Steps.astro';

Drizzle <> Expo SQLite

According to the official website, Expo is an ecosystem of tools to develop, build and ship applications on React Native. It's powered by Hermes JavaScript runtime and Metro bundler, Drizzle Expo driver is built to natively support both.

Drizzle ORM has the best in class toolkit for Expo SQLite:

Native ORM driver for Expo SQLite ✅
Drizzle Kit support for migration generation and bundling in application ✅
Drizzle Studio dev tools plugin to browse on device database ✅
Live Queries ✅

<Npm> drizzle-orm expo-sqlite@next -D drizzle-kit </Npm>

import { drizzle } from "drizzle-orm/expo-sqlite";
import { openDatabaseSync } from "expo-sqlite";

const expo = openDatabaseSync("db.db");
const db = drizzle(expo);

await db.select().from(users);

Live Queries

With useLiveQuery hook you can make any Drizzle query reactive:

import { useLiveQuery, drizzle } from 'drizzle-orm/expo-sqlite';
import { openDatabaseSync } from 'expo-sqlite';
import { Text } from 'react-native';
import * as schema from './schema';

const expo = openDatabaseSync('db.db', { enableChangeListener: true }); // <-- enable change listeners
const db = drizzle(expo);

const App = () => {
  // Re-renders automatically when data changes
  const { data } = useLiveQuery(db.select().from(schema.users));
  return <Text>{JSON.stringify(data)}</Text>;
};

export default App;

Expo SQLite migrations with Drizzle Kit

You can use Drizzle Kit for SQL migration generation.
Please make sure to check how Drizzle migrations work before proceeding.
Expo / React Native requires you to have SQL migrations bundled into the app and we've got you covered.

<Steps> #### Install babel plugin It's necessary to bundle SQL migration files as string directly to your bundle. ```shell npm install babel-plugin-inline-import ```

Update config files.

You will need to update babel.config.js, metro.config.js and drizzle.config.ts files

module.exports = function(api) {
  api.cache(true);

  return {
    presets: ['babel-preset-expo'],
    plugins: [["inline-import", { "extensions": [".sql"] }]] // <-- add this
  };
};

const { getDefaultConfig } = require('expo/metro-config');

/** @type {import('expo/metro-config').MetroConfig} */
const config = getDefaultConfig(__dirname);

config.resolver.sourceExts.push('sql'); // <--- add this

module.exports = config;

Make sure to have dialect: 'sqlite' and driver: 'expo' in Drizzle Kit config

import { defineConfig } from 'drizzle-kit';

export default defineConfig({
	schema: './db/schema.ts',
	out: './drizzle',
  dialect: 'sqlite',
	driver: 'expo', // <--- very important
});

Generate migrations

After creating SQL schema file and drizzle.config.ts file, you can generate migrations

bash

npx drizzle-kit generate

Add migrations to your app

Now you need to import migrations.js file into your Expo/React Native app from ./drizzle folder. You can run migrations on application startup using our custom useMigrations migrations hook on in useEffect hook manually as you want.

import { drizzle } from "drizzle-orm/expo-sqlite";
import { openDatabaseSync } from "expo-sqlite";
import { useMigrations } from 'drizzle-orm/expo-sqlite/migrator';
import migrations from './drizzle/migrations';

const expoDb = openDatabaseSync("db.db");

const db = drizzle(expoDb);

export default function App() {
  const { success, error } = useMigrations(db, migrations);

  if (error) {
    return (
      <View>
        <Text>Migration error: {error.message}</Text>
      </View>
    );
  }

  if (!success) {
    return (
      <View>
        <Text>Migration is in progress...</Text>
      </View>
    );
  }

  return ...your application component;
}

</Steps>