Dart APIunself_local_databaseLocalDatabasedocumentDao documentDao property Null safety DocumentDao documentDao latefinalinherited Implementation late final DocumentDao documentDao = DocumentDao(this as LocalDatabase); unself_local_database unself_local_database LocalDatabase documentDao 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 ==