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import 'package:sqflite/sqflite.dart';
import 'dart:io' as io;
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';
class DBHelper {
static Database _db;
Future<Database> get db async {
if (_db != null) {
return _db;
}
_db = await initDatabase();
return _db;
}
initDatabase() async {
io.Directory documentDirectory = await getApplicationDocumentsDirectory();
String path = join(documentDirectory.path, 'student.db');
var db = await openDatabase(path, version: 1, onCreate: _onCreate);
return db;
}
_onCreate(Database db, int version) async {
await db
.execute('CREATE TABLE student (id INTEGER PRIMARY KEY, name TEXT)');
}
Future<Student> add(Student student) async {
var dbClient = await db;
student.id = await dbClient.insert('student', student.toMap());
return student;
}
Future<List<Student>> getStudents() async {
var dbClient = await db;
List<Map> maps = await dbClient.query('student', columns: ['id', 'name']);
List<Student> students = [];
if (maps.length > 0) {
for (int i = 0; i < maps.length; i++) {
students.add(Student.fromMap(maps[i]));
}
}
return students;
}
Future<int> delete(int id) async {
var dbClient = await db;
return await dbClient.delete(
'student',
where: 'id = ?',
whereArgs: [id],
);
}
Future<int> update(Student student) async {
var dbClient = await db;
return await dbClient.update(
'student',
student.toMap(),
where: 'id = ?',
whereArgs: [student.id],
);
}
Future close() async {
var dbClient = await db;
dbClient.close();
}
}
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