If you’re using Expo with React Native, SQLite, and TypeORM, you might encounter an error like:
[TypeError: _this3.sqlite.openDatabase is not a function (it is undefined)]
This error typically occurs when the expo-sqlite
driver is not properly loaded or recognized by TypeORM. Here’s how to resolve it and ensure your SQLite database integration works correctly.
Problem Overview
The error arises from the following code:
import { DataSource } from 'typeorm';
import { UserEntity } from './models';
export const source = new DataSource({
database: 'finance.db',
type: 'expo',
driver: require('expo-sqlite'),
entities: [UserEntity],
synchronize: true,
});
In this snippet, TypeORM is attempting to use expo-sqlite
as the database driver. However, the error [TypeError: _this3.sqlite.openDatabase is not a function]
indicates that the openDatabase
method is undefined or not correctly referenced.
Solution: Update Your SQLite Import
To resolve this issue, you’ll need to explicitly import the expo-sqlite
module and ensure it is properly referenced in your TypeORM DataSource
configuration.
Here’s how you can fix the issue by updating the import and configuration:
import { DataSource } from 'typeorm';
import { UserEntity } from './models';
import * as SQLite from 'expo-sqlite/legacy'; // Correct import for SQLite
export const source = new DataSource({
database: 'finance.db',
type: 'expo',
driver: SQLite, // Use the SQLite driver correctly
entities: [UserEntity],
synchronize: true,
});
Steps to Resolve the Error
- Install
expo-sqlite
if not already installed: If you haven’t installedexpo-sqlite
yet, run the following command:
expo install expo-sqlite
- Modify the import for SQLite: Instead of using
require('expo-sqlite')
, switch to importing the module directly from'expo-sqlite/legacy'
. This ensures compatibility with TypeORM’s driver configuration.
import * as SQLite from 'expo-sqlite/legacy';
- Update the
DataSource
configuration: Ensure that thedriver
field in yourDataSource
configuration uses the correct SQLite import.
driver: SQLite,
- Test the Changes: After making these changes, run your Expo project to confirm the issue has been resolved.
expo start
Why This Fix Works
The error occurred because TypeORM expected the openDatabase
function to exist on the driver, but the require
statement didn’t load it correctly. By explicitly importing expo-sqlite
using * as SQLite from 'expo-sqlite/legacy'
, you ensure that TypeORM can access the correct SQLite API, preventing the undefined function error.
Conclusion
When integrating SQLite with Expo and TypeORM, you may encounter issues due to how the SQLite module is referenced. By following the steps above and ensuring the proper import of expo-sqlite
, you can resolve the [TypeError: _this3.sqlite.openDatabase is not a function]
error and successfully use SQLite in your Expo project.
If you’re still facing issues, ensure that your TypeORM and SQLite versions are compatible and up to date, as library updates may introduce breaking changes.
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