Dart APIunself_local_databaseLocalDatabasecollectionDao collectionDao property Null safety CollectionDao collectionDao latefinalinherited Implementation late final CollectionDao collectionDao = CollectionDao(this as LocalDatabase); unself_local_database unself_local_database LocalDatabase collectionDao property LocalDatabase class Constructors LocalDatabase Properties allSchemaEntities allTables allTablesCollections attachedDatabase collection collectionDao connection documentDao executor field hashCode migration options resolvedEngine runtimeType schemaVersion streamQueries streamUpdateRules typeMapping Methods $expandVar $write $writeInsertable alias batch beforeOpen close createMigrator createStream customInsert customSelect customSelectQuery customStatement customUpdate customWriteReturning delete doWhenOpened into markTablesUpdated noSuchMethod notifyUpdates select selectOnly tableUpdates toString transaction update Operators operator ==