import 'package:comunic/helpers/database/database_contract.dart'; import 'package:comunic/helpers/database/database_helper.dart'; import 'package:comunic/models/cache_model.dart'; /// Model database helper /// /// Base model for caching data in the database /// /// @author Pierre HUBERT abstract class ModelDatabaseHelper { /// Get the name of the target table. Must be specified by the children /// of this class String tableName(); /// Initialize an element from a map T initializeFromMap(Map map); /// Insert an entry in the database Future _insertDB(T el) async { await (await DatabaseHelper.get()).insert(tableName(), el.toMap()); } /// Update an element in the database Future _updateDB(T el) async { await (await DatabaseHelper.get()).update( tableName(), el.toMap(), where: "${BaseTableContract.C_ID} = ?", whereArgs: [el.id], ); } /// Get an element from the database with a specified [id] /// /// Returns null if none found Future get(int id) async { List maps = await (await DatabaseHelper.get()).query( tableName(), where: '${BaseTableContract.C_ID} = ?', whereArgs: [id], ); if (maps.length > 0) return initializeFromMap(maps[0]); return null; } /// Get all the entries from the table Future> getAll() async { List maps = await (await DatabaseHelper.get()).query(tableName()); return maps.map((f) => initializeFromMap(f)).toList(); } /// Get some entries from the table based on some conditions Future> getMultiple( {bool distinct, List columns, String where, List whereArgs, String groupBy, String having, String orderBy, int limit, int offset}) async { List maps = await (await DatabaseHelper.get()).query( tableName(), distinct: distinct, columns: columns, where: where, whereArgs: whereArgs, groupBy: groupBy, having: having, orderBy: orderBy, limit: limit, offset: offset, ); return maps.map((f) => initializeFromMap(f)).toList(); } /// Empty the table Future clearTable() async { await (await DatabaseHelper.get()).execute("DELETE FROM ${tableName()}"); } /// Check out whether an element specified with its [id] is present /// or not in the local database Future has(int id) async { return (await get(id)) != null; } /// Insert or update information about a el (depends of the presence /// of previous element information in the database Future insertOrUpdate(T el) async { if (await has(el.id)) await _updateDB(el); else await _insertDB(el); } /// Insert or update an important amount of elements Future insertOrUpdateAll(List list) async { for (int i = 0; i < list.length; i++) await insertOrUpdate(list[i]); } /// Insert an important amount of elements /// /// This might throw if there are conflicting IDs Future insertAll(List list) async { for (T el in list) await _insertDB(el); } }