Enum Mutation 

pub enum Mutation {
    Add {
        table: String,
        row: Vec<OwnedValue>,
    },
    Remove {
        table: String,
        row: Vec<OwnedValue>,
    },
    Edit {
        table: String,
        old: Vec<OwnedValue>,
        new: Vec<OwnedValue>,
    },
    Truncate {
        table: String,
    },
    Upsert {
        table: String,
        row: Vec<OwnedValue>,
    },
}

One positional mutation (cells aligned to the table’s column order).

Variants

Add

Fields

table: String

row: Vec<OwnedValue>

Remove

Fields

table: String

row: Vec<OwnedValue>

Edit

Fields

table: String

old: Vec<OwnedValue>

new: Vec<OwnedValue>

Truncate

Every row of table goes (a source TRUNCATE, design 406 §5.1). Applied as a plain DELETE FROM, which the preupdate hook observes row by row (SQLite disables its truncate optimization when a preupdate hook is registered), so IVM sees exact removes.

Fields

table: String

Upsert

Insert-or-update by key (design 406 §9): a backfill row copied at a snapshot. The present cells are written whether or not the row exists; absent cells keep their stored value on an existing row and are left NULL on a new one. The preupdate hook yields the exact add/edit to IVM, so no run-kind flag reaches the engine.

Fields

table: String

row: Vec<OwnedValue>

Implementations

impl Mutation

pub fn table(&self) -> &str

The base table this mutation targets.

Trait Implementations

impl Clone for Mutation

fn clone(&self) -> Mutation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Mutation

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

Formats the value using the given formatter.