Category: Development

Create zip file in dart
Creating a zip file in Dart is not that hard. Though there are not many packages right now to work with, so far we have only two packages which we can use to create zip, tar and others in dart.

If you have not installed dart yet please go to my post here.

Visit Pub Dev where you can find all kinds of packages for Flutter and Dart. Some packages work with both Flutter and Dart but not all of them.

Go to https://pub.dev/ and search zip you will find these two packages
1. Archive https://pub.dev/packages/archive, for Dart and Flutter.
2. Flutter Archive https://pub.dev/packages/flutter_archive for only Flutter project.
In our case we will use the Archive package since we are testing in a console application.

The Archive library currently supports the following decoders:
- Zip (Archive)
- Tar (Archive)
- ZLib [Inflate decompression]
- GZip [Inflate decompression]
- BZip2 [decompression]
Add Archive package in your project

With Dart
```
dart pub add archive
```
With Flutter
```
flutter pub add archive
```
Our pubspec.yaml
```
name: Create zip file in dart
description: A sample command-line application to create zip file
version: 1.0.0
homepage: https://flutterframework.com/

environment:
  sdk: '>=2.10.0 <3.0.0'

dependencies:
  archive: ^3.1.2

dev_dependencies:
  pedantic: ^1.9.0
  test: ^1.14.4
```
Our main zip.dart
```
import 'package:zip/zip.dart' as zip;

void main(List<String> arguments) {
  zip.createZip();
}
```
and lib/zip.dart
```
import 'dart:io';

import 'package:archive/archive.dart';
import 'package:archive/archive_io.dart';

void createZip() {
  final logDir = Directory.current.path + '/log';
  final zipLocation = Directory.current.path + '/log.zip';

  var encoder = ZipFileEncoder();
  encoder.zipDirectory(Directory(logDir), filename: zipLocation);

  // Manually create a zip of a directory and individual files.
  encoder.create(Directory.current.path + '/log2.zip');
  encoder.addFile(File('another_file.txt'));

  encoder.close();
}
```
Line number 10 creates a zip file in the destination file(line 8), from line 7 which is a directory containing few txt files.

You can create more zip file in the same encoder process, line 16 and more file line 17.

Download the source code from github.com

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May 3, 2021
Install flutter mac by brew
Flutter got easier to install on any Mac, just install it by home brew. It will install both flutter and dart.
```
brew install flutter
```
Check version of Flutter
```
flutter --version
```
Check version of Dart
```
dart --version
```
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March 7, 2021

MySQL and Maria DB connection with Dart language

Connect to MySQL or Maria DB server from Dart is very easy. We just need a couple of packages.

Create your pubspec.yaml and add mysqli as a dependency. And run

name: mysql
description: A sample command-line application.
# version: 1.0.0
# homepage: https://www.example.com
# author: sminrana <[email protected]>

environment:
  sdk: '>=2.0.0 <3.0.0'

dependencies:
  mysql1: ^0.17.1

dev_dependencies:
  test: ^1.0.0

pub get

Create a file name main.dart which looks like this

import 'dart:async';
import 'dart:io';

import 'package:mysql1/mysql1.dart';

Future main() async {
  final conn = await MySqlConnection.connect(ConnectionSettings(
      host: 'localhost', port: 3306, user: 'root', password: '1234', db: 'database_name'));


  // Create a table
  await conn.query(
      'CREATE TABLE users (id int NOT NULL AUTO_INCREMENT PRIMARY KEY, name varchar(255), email varchar(255), age int)');

  // Insert some data
  var result = await conn.query(
      'insert into users (name, email, age) values (?, ?, ?)',
      ['Bob', '[email protected]', 25]);
  print('Inserted row id=${result.insertId}');

  // Query the database using a parameterized query
  var results = await conn
      .query('select name, email from users where id = ?', [result.insertId]);
  for (var row in results) {
    print('Name: ${row[0]}, email: ${row[1]}');
  }

  // Finally, close the connection
  await conn.close();
}

Here Future main async as an asynchronous dart main function which is required due to async call on line 7, here we must wait for await MySqlConnection to be finished its process.

Similarly we must wait for the task to be finished on line 12, we create a database table on this line.

Finally run the code by

dart main.dart

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July 11, 2020

Category: Development

Create zip file in dart

Install flutter mac by brew

MySQL and Maria DB connection with Dart language