psycopg2 - Dart

Psycopg2 is a popular PostgreSQL database connector for Python applications. Dart is a client-optimized programming language for web and mobile development. In this article, we will discuss the psycopg2-dart package, which allows developers to connect to PostgreSQL databases from Dart applications.

Installation

To use the psycopg2-dart package, you need to add it to your pubspec.yaml file. You can do this by running the following command in your terminal:

$ pub get psycopg2_dart

Usage

After installing the package, you can import it into your Dart code:

import 'package:psycopg2_dart/psycopg2_dart.dart';

Connection

To create a connection to a PostgreSQL database, you can use the connect method:

void main() async {
  PostgreSQLConnection connection = await connect(
        host: 'localhost', // your host name
        port: 5432, // your port number
        databaseName: 'my_db', // your database name
        username: 'postgres', // your username
        password: 'password', // your password
      );
}

Executing Queries

After establishing the connection, you can execute queries on the database. For example, to fetch data from a table, you can use the query method:

PostgreSQLResult result = await connection.query('SELECT * FROM my_table');
result.forEach((row) {
  print('Column 1: ${row[0]}, Column 2: ${row[1]}');
});

Transactions

You can execute multiple queries inside a transaction by using the transaction method:

await connection.transaction((ctx) async {
  await ctx.query('INSERT INTO my_table (column1, column2) VALUES (value1, value2)');
  await ctx.query('UPDATE my_table SET column2 = value3 WHERE column1 = value1');
});

Closing the Connection

To close the connection to the database, you can use the close method:

await connection.close();

Conclusion

In this article, we discussed the psycopg2-dart package, which allows developers to connect to PostgreSQL databases from Dart applications. We covered how to establish a connection, execute queries, and handle transactions. We hope this article helps you with your Dart and PostgreSQL development!