Dart APIunself_local_databaseCollectionDaoCollectionDao constructor CollectionDao constructor Null safety CollectionDao(LocalDatabase db ) Implementation CollectionDao(LocalDatabase db) : super(db); unself_local_database unself_local_database CollectionDao CollectionDao constructor CollectionDao class Constructors CollectionDao Properties attachedDatabase collection connection executor field hashCode options resolvedEngine runtimeType streamQueries typeMapping Methods $expandVar $write $writeInsertable alias batch createStream customInsert customSelect customSelectQuery customStatement customUpdate customWriteReturning delete deleteCollection doWhenOpened getCollectionById into markTablesUpdated noSuchMethod notifyUpdates saveCollection select selectOnly tableUpdates toString transaction update Operators operator ==