Enum Variable 

pub enum Variable {
    Scalar(Columns),
    Columns(Columns),
    ForIterator {
        columns: Columns,
        index: usize,
    },
    Closure(ClosureValue),
}

A variable can be either a scalar value, columnar data, a FOR loop iterator, or a closure

Variants

Scalar(Columns)

A scalar value stored as a 1-column, 1-row Columns

Columns(Columns)

Columnar data that requires explicit conversion to scalar

ForIterator

A FOR loop iterator tracking position in a result set

Fields

columns: Columns

index: usize

Closure(ClosureValue)

A closure (anonymous function with captured environment)

Implementations

impl Variable

pub fn scalar(value: Value) -> Self

Create a scalar variable from a single Value.

pub fn columns(columns: Columns) -> Self

Create a columns variable

Trait Implementations

impl Clone for Variable

fn clone(&self) -> Variable

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Variable

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.