NullAwareTypeConverter<D, S extends Object> class abstract

A type converter automatically mapping null values to null in both directions.

Instead of overriding fromSql and toSql, subclasses of this converter should implement requireFromSql and requireToSql, which are used to map non-null values to and from sql values, respectively.

Apart from the implementation changes, subclasses of this converter can be used just like all other type converters.

Inheritance

Constructors

NullAwareTypeConverter()
Constant default constructor, allowing subclasses to be constant.
const
NullAwareTypeConverter.wrap(TypeConverter<D, S> inner)
Wraps an inner type converter that only considers non-nullable values as a type converter that handles null values too.
const
factory

Properties

hashCode → int
The hash code for this object.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

fromSql(S? fromDb) → D?
Maps a column from the database back to Dart.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
requireFromSql(S fromDb) → D
Maps a non-null column from the database back to Dart.
requireToSql(D value) → S
Map a non-null value from an object in Dart into something that will be understood by the database.
toSql(D? value) → S?
Map a value from an object in Dart into something that will be understood by the database.
override
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited

Static Methods

wrapFromSql<D, S>(TypeConverter<D, S> inner, S? sqlValue) → D?
Invokes a non-nullable inner type converter for a single conversion from SQL to Dart.
wrapToSql<D, S>(TypeConverter<D, S> inner, D? dartValue) → S?
Invokes a non-nullable inner type converter for a single conversion from Dart to SQL.