Connecting a PostgreSQL database to a mobile app built with Flutter and Dart involves several steps.
Build the PostgreSQL Database
Kindly make sure you have a PostgreSQL database server installed and running perfectly on the cloud server.
Create a new database and do the necessary steps in creating the required tables for your application.
Ensure that your PostgreSQL server is configured to accept remote connections if your mobile app is not running on the same machine as the database.
Dart Packages
Add the necessary Dart packages to your Flutter project. The commonly used package for connecting to PostgreSQL databases is postgres.
Dependencies
- flutter
- sdk: flutter
- postgres: ^2.4.0
Run flutter packages get to install the dependencies.
Database Connection Code
Write Dart code to connect to the PostgreSQL database using the postgres package.
Below is a simple example for the reference:
import 'package:postgres/postgres.dart';
void main() async {
final connection = PostgreSQLConnection( 'your_host',5432, 'your_database_name', username: 'your_username', password: 'your_password',);
await connection.open();
// Code for database operation.
await connection.close();
}
Once connected, you can execute SQL queries to perform operations like fetching data, inserting, updating, or deleting records.
// here is the Example query to fetch data
final results = await connection.query('SELECT * FROM your_table_name');
for (var row in results) {
print('Column 1: ${row[0]}, Column 2: ${row[1]}');
}
Also, note that database operations are typically asynchronous. Ensure that you handle asynchronous code appropriately using async and await keywords.
Implement proper error handling to manage issues such as connection failures, query errors, etc.
When deploying your mobile app, ensure that the PostgreSQL server is accessible from the deployed environment.