Flow PHP

UniqueConstraint implements Constraint, Stateful

FinalYes

Constraint
Stateful: Every run starts from a fresh instance; a parallel read never ships it to a worker.

__construct() : mixed
firstViolation() : int|null: Index of the first row that violates; state advances over the rows before it.
fresh() : static: A new instance in the state this one was constructed in.
toString() : string
violation() : string


    public
                    __construct(string|Reference $column, string|Reference ...$columns) : mixed

Index of the first row that violates; state advances over the rows before it.


    public
                    firstViolation(Rows $rows) : int|null

int|null

A new instance in the state this one was constructed in.


    public
                    fresh() : static

static


    public
                    toString() : string

string


    public
                    violation(Rows $rows, int $index) : string

string