WriteValue<T, F extends Fields> class sealed

A reusable typed write intent, before it is bound to a table occurrence.

Omission, a literal (including an allowed null), SQL DEFAULT and an SQL expression remain distinct while generated inputs are composed and forwarded. Creating or overlaying an intent does not evaluate an expression or a client default. Expressions are evaluated and literals encoded when the input enters a mutation builder. Mutable literal objects and captured application state remain caller-owned and must remain stable until then. Bound byte storage is copied into a read-only snapshot. Other mutable storage returned by custom codecs must remain stable for every replay.

Constructors

WriteValue.databaseDefault()

Requests the database default rather than a client default.

const

factory

WriteValue.expression(Expr<T> expression(F))

Supplies an expression constructed against the actual mutation fields.

const

factory

WriteValue.keep()

Omits this field. During overlay, omission preserves the earlier intent.

const

factory

WriteValue.set(T value)

Supplies a literal, which is encoded when the mutation is prepared.

const

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

isMissing → bool

Whether this intent represents an omitted field.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

overlay<T, F extends Fields>(WriteValue<T, F> earlier, WriteValue<T, F> later) → WriteValue<T, F>

Uses the later supplied intent, or keeps the earlier one when omitted.