https://github.com/idkjs/todo-app-dart
First Shot at Dartlang/Flutter
https://github.com/idkjs/todo-app-dart
android dartlang flutter ios
Last synced: 3 months ago
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First Shot at Dartlang/Flutter
- Host: GitHub
- URL: https://github.com/idkjs/todo-app-dart
- Owner: idkjs
- Created: 2018-08-27T17:13:32.000Z (almost 7 years ago)
- Default Branch: master
- Last Pushed: 2019-02-17T20:58:40.000Z (over 6 years ago)
- Last Synced: 2025-02-04T16:51:13.394Z (5 months ago)
- Topics: android, dartlang, flutter, ios
- Language: Dart
- Size: 346 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# todo_app
A new Flutter project.
## Database Class
Install deps from [package manager](https://pub.dartlang.org/packages/) [sqflite](https://pub.dartlang.org/packages/sqflite), [path_provider](https://pub.dartlang.org/packages/path_provider), [intl](https://pub.dartlang.org/packages/intl) by adding them to pubspec.yml
## Using Raw SQL
These methods are interchangeable and operate asynchronously.
```sql
db.rawQuery("SELECT * FROM yourTable" );
db.rawInsert('INSERT INTO yourTable(name, num)
VALUES("some name", 1234)');
db.rawUpdate('UPDATE yourTable SET name = ?,
WHERE name = ?', ["new name", "old name"]);
db.rawDelete('DELETE FROM yourTable WHERE id = 1');
```
## Using [SQFLite](https://pub.dartlang.org/packages/sqflite) Helpers
```dart
db.update('yourTable',
yourObject.toMap(),
where: "$colId = ?",
whereArgs: [yourObject.id]);
```
## Adding to pubspec.yml
Go to `pubspec.yml` and list the dependencies. Use version 0.15.7 for intl
```yml
dependencies:
flutter:
sdk: flutter
sqflite: any
path_provider: any
intl: ^0.15.7
```
## DBHelper for accessing the sqldb
Create class for db declaring our tables and columns, so String tblTodo = "todo" declars tbleTodo as string type and sets it todo which is the name or table. Same idea for columns.
```dart
class DbHelper {
String tblTodo = "todo";
String colId = "id";
String coltitle = "title";
String colDescription = "description";
String colPriority = "priority";
String colDate = "date";
}
```
Since we only want this class to be called once, so we need to turn it into a singleton. Singleton restricts the instantiation of a class to one object only.
So basically you can't call DbHelper more than once in your program. Instead of creating a new instance the factory constructor is only required to return one instance of the class.
Note: `factory` where dartlang's factory constructor lets you override the default behaviour, which is not singleton, and use the class as a singleton.
### How it works:
```dart
class DbHelper {
static final DbHelper _dbHelper = DbHelper._interal();
String tblTodo = "todo";
String colId = "id";
String coltitle = "title";
String colDescription = "description";
String colPriority = "priority";
String colDate = "date";
DbHelper._internal();
factory DbHelper(){
return _dbHelper;
}
}
```
## Async/Await/Futures
These methods are interchangeable in dartlang.
**Futures**
**Async/Await**
