Enum WriteOp 

pub enum WriteOp {
    Set(FilterValue),
    Increment(FilterValue),
    Decrement(FilterValue),
    Multiply(FilterValue),
    Divide(FilterValue),
    Unset,
}

One scalar update operator applied to a column.

Mirrors the *FieldUpdate wrapper structs in crate::inputs::scalar_update. Each wrapper lowers exactly one of its set-only / increment / decrement / multiply / divide / unset fields to the matching variant here.

Variants

Set(FilterValue)

col = value — the default form.

Increment(FilterValue)

col = col + value — numeric scalars only.

Decrement(FilterValue)

col = col - value — numeric scalars only.

Multiply(FilterValue)

col = col * value — numeric scalars only.

Divide(FilterValue)

col = col / value — numeric scalars only.

Unset

col = NULL — nullable scalars only.

Implementations

impl WriteOp

pub fn is_arithmetic(&self) -> bool

True when the operator targets a numeric column.

Used by the SQL emitter to pick between col = $n (Set/Unset) and col = col <op> $n (the arithmetic variants).

pub fn to_set_fragment( &self, column: &str, placeholder: &str, ) -> (String, Option<FilterValue>)

Render this operator as a SET-clause fragment.

Given the column name and a 1.. placeholder offset, returns the textual fragment (col = $1, col = col + $1, col = NULL) and the value to push to the parameter list. Unset returns None for the value — the caller skips the parameter slot.

Trait Implementations

impl Clone for WriteOp

fn clone(&self) -> WriteOp

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WriteOp

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

Formats the value using the given formatter.

impl PartialEq for WriteOp

fn eq(&self, other: &WriteOp) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for WriteOp