Dart APIunself_local_databaseFieldid id property Null safety TextColumn id Implementation TextColumn get id => text()(); unself_local_database unself_local_database Field id property Field class Constructors Field Properties collectionId created customConstraints dontWriteConstraints extra hashCode id isStrict name primaryKey required runtimeType system tableName type unique uniqueKeys updated withoutRowId Methods blob boolean dateTime int64 integer intEnum noSuchMethod real text textEnum toString Operators operator ==