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database.dart
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database.dart
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import 'package:mvvm_todo_list/domain/db_model.dart';
import 'package:mvvm_todo_list/domain/models/todo_item.dart';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';
import 'package:flutter/services.dart';
/// Singleton сервис для определения базовых функций работы с БД
class DB {
DB._();
static final DB instance = DB._();
static late Database _db;
static bool _isInitialized = false;
/// При изменении структуры базы, необходимо увеличить версию Базы (в названии файла)
Future init() async {
if (!_isInitialized) {
var databasePath = await getDatabasesPath();
var path = join(databasePath, "db_v1.0.2.db"); // Вот тут меняется версия
_db = await openDatabase(path, version: 1, onCreate: _createDB);
_isInitialized = true;
}
}
/// Обязательно не забыть добавить путь до файла (в формате assets/<файл инициализации>.sql)
/// в pubspec.yaml. Пример добавления новой таблицы есть в самом файле db_init.sql
Future _createDB(Database db, int version) async {
var dbInitScript = await rootBundle.loadString('assets/db_init.sql');
dbInitScript.split(';').forEach((element) async {
if (element.isNotEmpty) {
await db.execute(element);
}
});
}
static final _factories = <Type, Function(Map<String, dynamic> map)>{
ToDoItem: (map) => ToDoItem.fromMap(map),
};
String _dbName(Type type) {
if (type == DbModel) {
throw Exception("Type is required");
}
return "t_${(type).toString()}";
}
Future<Iterable<T>> getAll<T extends DbModel>({
Map<String, Object?>? whereMap,
int? take,
int? skip,
}) async {
Iterable<Map<String, dynamic>> query;
if (whereMap != null) {
var whereBuilder = <String>[];
var whereArgs = <dynamic>[];
whereMap.forEach((key, value) {
if (value is Iterable<dynamic>) {
whereBuilder
.add("$key IN (${List.filled(value.length, '?').join(',')})");
whereArgs.addAll(value.map((e) => "$e"));
} else {
whereBuilder.add("$key = ?");
whereArgs.add(value);
}
});
query = await _db.query(_dbName(T),
where: whereBuilder.join(' and '),
whereArgs: whereArgs,
offset: skip,
limit: take);
} else {
query = await _db.query(
_dbName(T),
offset: skip,
limit: take,
);
}
var resList = query.map((e) => _factories[T]!(e)).cast<T>();
return resList;
}
Future<T?> get<T extends DbModel>(dynamic id) async {
var res = await _db.query(
_dbName(T),
where: 'id = ? ',
whereArgs: [id],
);
return res.isNotEmpty ? _factories[T]!(res.first) : null;
}
Future<int> insert<T extends DbModel>(T model) async => await _db.insert(
_dbName(T),
model.toMap(),
conflictAlgorithm: null,
nullColumnHack: null,
);
Future<int> update<T extends DbModel>(T model) async => _db.update(
_dbName(T),
model.toMap(),
where: 'id = ?',
whereArgs: [model.id],
);
Future<int> delete<T extends DbModel>(T model) async => _db.delete(
_dbName(T),
where: 'id = ?',
whereArgs: [model.id],
);
Future<int> cleanTable<T extends DbModel>() async =>
await _db.delete(_dbName(T));
Future<int> createUpdate<T extends DbModel>(T model) async {
var dbItem = await get<T>(model.id);
var res = dbItem == null ? insert(model) : update(model);
return await res;
}
Future insertRange<T extends DbModel>(Iterable<T> values) async {
var batch = _db.batch();
for (var row in values) {
var data = row.toMap();
batch.insert(_dbName(T), data);
}
await batch.commit(noResult: true);
}
Future createUpdateRange<T extends DbModel>(Iterable<T> values,
{bool Function(T oldItem, T newItem)? updateCondition}) async {
var batch = _db.batch();
for (var row in values) {
var dbItem = await get<T>(row.id);
var data = row.toMap();
if (dbItem == null) {
batch.insert(_dbName(T), data);
} else if (updateCondition == null || updateCondition(dbItem, row)) {
batch.update(_dbName(T), data, where: 'id = ?', whereArgs: [row.id]);
}
}
await batch.commit(noResult: true);
}
}