import Npm from '@mdx/Npm.astro'; import Npx from '@mdx/Npx.astro'; import Callout from '@mdx/Callout.astro'; import Prerequisites from "@mdx/Prerequisites.astro"; import CodeTabs from "@mdx/CodeTabs.astro"; import WhatsNextPostgres from "@mdx/WhatsNextPostgres.astro"; import Breadcrumbs from '@mdx/Breadcrumbs.astro'; import FileStructure from '@mdx/get-started/FileStructure.mdx'; import InstallPackages from '@mdx/get-started/InstallPackages.mdx'; import SetupConfig from '@mdx/get-started/SetupConfig.mdx'; import TransferCode from '@mdx/get-started/TransferCode.mdx'; import QueryDatabase from '@mdx/get-started/QueryDatabase.mdx'; import QueryDatabaseUpdated from '@mdx/get-started/QueryDatabaseUpdated.mdx'; import RunFile from '@mdx/get-started/RunFile.mdx'; import ApplyChanges from '@mdx/get-started/ApplyChanges.mdx'; import SetupEnv from '@mdx/get-started/SetupEnv.mdx'; import CreateTable from '@mdx/get-started/sqlite/CreateTable.mdx'; import ConnectLibsql from '@mdx/get-started/sqlite/ConnectLibsql.mdx'; # Get Started with Drizzle and Expo - **Expo SQLite** - A library that provides access to a database that can be queried through a SQLite API - [read here](https://docs.expo.dev/versions/latest/sdk/sqlite/) #### Step 1 - Setup a project from Expo Template create expo-app --template blank-typescript You can read more about this template [here](https://docs.expo.dev/more/create-expo/#create-a-new-project). #### Basic file structure After installing the template and adding the `db` folder, you'll find the following content: In the `db/schema.ts` file with drizzle table definitions. The `drizzle` folder contains SQL migration files and snapshots ```plaintext 📦 ├ 📂 assets ├ 📂 drizzle ├ 📂 db │ └ 📜 schema.ts ├ 📜 .gitignore ├ 📜 .npmrc ├ 📜 app.json ├ 📜 App.tsx ├ 📜 babel.config.ts ├ 📜 drizzle.config.ts ├ 📜 package.json └ 📜 tsconfig.json ``` #### Step 2 - Install expo-sqlite package expo install expo-sqlite #### Step 3 - Install required packages drizzle-orm -D drizzle-kit #### Step 4 - Connect Drizzle ORM to the database Create a `App.tsx` file in the root directory and initialize the connection: ```ts import * as SQLite from 'expo-sqlite'; import { drizzle } from 'drizzle-orm/expo-sqlite'; const expo = SQLite.openDatabaseSync('db.db'); const db = drizzle(expo); ``` #### Step 4 - Create a table Create a `schema.ts` file in the `db` directory and declare your table: ```typescript copy filename="src/db/schema.ts" import { int, sqliteTable, text } from "drizzle-orm/sqlite-core"; export const usersTable = sqliteTable("users_table", { id: int().primaryKey({ autoIncrement: true }), name: text().notNull(), age: int().notNull(), email: text().notNull().unique(), }); ``` #### Step 5 - Setup Drizzle config file **Drizzle config** - a configuration file that is used by [Drizzle Kit](/docs/kit-overview) and contains all the information about your database connection, migration folder and schema files. Create a `drizzle.config.ts` file in the root of your project and add the following content: ```ts import { defineConfig } from 'drizzle-kit'; export default defineConfig({ dialect: 'sqlite', driver: 'expo', schema: './db/schema.ts', out: './drizzle', }); ``` #### Step 6 - Setup `metro` config Create a file `metro.config.js` in root folder and add this code inside: ```js copy filename="metro.config.js" const { getDefaultConfig } = require('expo/metro-config'); /** @type {import('expo/metro-config').MetroConfig} */ const config = getDefaultConfig(__dirname); config.resolver.sourceExts.push('sql'); module.exports = config; ``` #### Step 7 - Update `babel` config ```js copy filename="babel.config.js" module.exports = function(api) { api.cache(true); return { presets: ['babel-preset-expo'], plugins: [["inline-import", { "extensions": [".sql"] }]] // <-- add this }; }; ``` #### Step 8 - Applying changes to the database With Expo, you would need to generate migrations using the `drizzle-kit generate` command and then apply them at runtime using the `drizzle-orm` `migrate()` function Generate migrations: ```bash copy npx drizzle-kit generate ``` #### Step 9 - Apply migrations and query your db: Let's **App.tsx** file with migrations and queries to create, read, update, and delete users ```ts copy import { Text, View } from 'react-native'; import * as SQLite from 'expo-sqlite'; import { useEffect, useState } from 'react'; import { drizzle } from 'drizzle-orm/expo-sqlite'; import { usersTable } from './db/schema'; import { useMigrations } from 'drizzle-orm/expo-sqlite/migrator'; import migrations from './drizzle/migrations'; const expo = SQLite.openDatabaseSync('db.db'); const db = drizzle(expo); export default function App() { const { success, error } = useMigrations(db, migrations); const [items, setItems] = useState(null); useEffect(() => { if (!success) return; (async () => { await db.delete(usersTable); await db.insert(usersTable).values([ { name: 'John', age: 30, email: 'john@example.com', }, ]); const users = await db.select().from(usersTable); setItems(users); })(); }, [success]); if (error) { return ( Migration error: {error.message} ); } if (!success) { return ( Migration is in progress... ); } if (items === null || items.length === 0) { return ( Empty ); } return ( {items.map((item) => ( {item.email} ))} ); } ``` #### Step 10 - Prebuild and run expo app ```bash copy npx expo run:ios ``` ```bash copy yarn expo run:ios ``` ```bash copy pnpm expo run:ios ``` ```bash copy bun expo run:ios ```

Expo Setup