Dart APIunself_local_databaseCollectiontype type property Null safety TextColumn type Implementation TextColumn get type => textEnum<CollectionType>()(); unself_local_database unself_local_database Collection type property Collection class Constructors Collection Properties created createRule customConstraints deleteRule dontWriteConstraints extra hashCode id isStrict listRule name primaryKey runtimeType system tableName type uniqueKeys updated updateRule viewRule withoutRowId Methods blob boolean dateTime int64 integer intEnum noSuchMethod real text textEnum toString Operators operator ==