Initial commit

lib/utils/dbhelper_sqflite.dart

@@ -0,0 +1,120 @@
+import 'dart:io';
+import 'package:path/path.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:dash/models/car.dart';
+import 'package:dash/models/txn.dart';
+
+//https://suragch.medium.com/simple-sqflite-database-example-in-flutter-e56a5aaa3f91
+// class dbWrapper {
+//   if (Platform.isWindows or Platform.isLinux or ) {
+//     print('build does not support sqlite')
+//   }
+// }
+
+class DbHelperSqlite {
+  final _dbName = "cars_sqlite.db";
+  final _dbVersion = 1;
+
+  // make singleton class
+  DbHelperSqlite._privateConstructor();
+  static final DbHelperSqlite instance = DbHelperSqlite._privateConstructor();
+  static Database? _database;
+
+  Future<Database?> get database async {
+    _database = await _initDatabase();
+    return _database!;
+  }
+
+  // open db and create if not exists
+  _initDatabase() async {
+    print('initializing db');
+    Directory documentsDirectory = await getApplicationDocumentsDirectory();
+    String dbPath = join(documentsDirectory.path, _dbName);
+    return await openDatabase(dbPath, version: _dbVersion, onCreate: _onCreate);
+  }
+
+  Future _onCreate(Database db, int version) async {
+    //docs say to avoid autoincrement
+    //looks like this may be a null issue?
+    await db.execute('''
+      CREATE TABLE ${Car.tblCars} (
+        ${Car.colId} INTEGER PRIMARY KEY,
+        ${Car.colVin} TEXT UNIQUE,
+        ${Car.colNickname} TEXT,
+        ${Car.colMileage} INTEGER,
+        ${Car.colPlate} TEXT);
+      CREATE TABLE ${Txn.tblTxns} (
+        ${Txn.colId} INTEGER PRIMARY KEY,
+        ${Txn.colType} TEXT,
+        ${Txn.colDatetime} INTEGER,
+        ${Txn.colCost} REAL,
+        ${Txn.colMileage} INTEGER,
+        ${Txn.colNote} TEXT,
+        FOREIGN KEY(${Txn.colCarId}) REFERENCES ${Car.tblCars}(${Car.colId}),
+        )''');
+  }
+
+  Future<int> insertCar(Car car) async {
+    Database db = await instance.database as Database;
+    return await db.insert(Car.tblCars, car.toMap(),
+        conflictAlgorithm: ConflictAlgorithm.abort);
+  }
+
+  Future<List<Car>> fetchCars() async {
+    Database db = await database as Database;
+    List<Map<String, dynamic>> cars = await db.query(Car.tblCars);
+    if (cars.isEmpty) {
+      return [];
+    } else {
+      return cars.map((car) => Car.fromMap(car)).toList();
+    }
+  }
+
+  Future<int> updateCar(Car car) async {
+    Database db = await instance.database as Database;
+    print('car id to update: ${car.id}');
+    return await db.update(Car.tblCars, car.toMap(),
+        where: '${Car.colId}=?', whereArgs: [car.id]);
+  }
+
+  Future<int> deleteCar(Car car) async {
+    Database db = await instance.database as Database;
+    print('car id to delete: ${car.id}');
+    return await db
+        .delete(Car.tblCars, where: '${Car.colId}=?', whereArgs: [car.id]);
+  }
+
+  Future<int> deleteAll() async {
+    Database db = await instance.database as Database;
+    return await db.rawDelete("DELETE FROM ${Car.tblCars}");
+  }
+}
+
+// flutter ex: https://docs.flutter.dev/cookbook/persistence/sqlite
+/*   Future<void> insertCar(Car car) async {
+    final db = await database;
+    await db.insert(
+      'cars',
+      car.toMap(),
+      conflictAlgorithm: ConflictAlgorithm.abort,
+    );
+  } */
+
+/*   Future<void> insertTestCar(Car car) async {
+    final db = await database;
+    await db.insert('cars', car.toMap(),
+        conflictAlgorithm: ConflictAlgorithm.abort);
+  }
+
+
+  Future<int> deleteCar(String vin) async {
+    Database db = await instance.database;
+    return await db.delete(tableCars, where: '$colVin=?', whereArgs: [vin]);
+  }
+
+  Future<List<Map<String, dynamic>>> queryAllCars() async {
+    Database db = await instance.database;
+    return await db.query(tableCars);
+  }
+} */