Enum ChangesetOp 

pub enum ChangesetOp<'a, T, S, B> {
    Insert {
        table: &'a T,
        values: &'a [Value<S, B>],
        indirect: bool,
    },
    Update {
        table: &'a T,
        values: &'a [ChangesetUpdatePair<S, B>],
        indirect: bool,
    },
    Delete {
        table: &'a T,
        old_values: &'a [Value<S, B>],
        indirect: bool,
    },
}

View over one operation in a changeset.

Variants

Insert

INSERT. Carries every column’s value in column order.

Fields

table: &'a T

Table this row belongs to.

values: &'a [Value<S, B>]

Full row values, one per column.

indirect: bool

SQLite session-extension indirect flag.

Update

UPDATE. Carries (old, new) pairs per column. None in either slot means “undefined” (the column was not part of the diff).

Fields

table: &'a T

Table this row belongs to.

values: &'a [ChangesetUpdatePair<S, B>]

(old, new) pairs, one per column.

indirect: bool

SQLite session-extension indirect flag.

Delete

DELETE. Carries the full old-row values in column order.

Fields

table: &'a T

Table this row belongs to.

old_values: &'a [Value<S, B>]

Full old-row values, one per column.

indirect: bool

SQLite session-extension indirect flag.

Implementations

impl<'a, T, S, B> ChangesetOp<'a, T, S, B>

pub fn table(&self) -> &'a T

Returns the schema of the table this operation applies to.

pub fn indirect(&self) -> bool

Returns the SQLite session-extension indirect flag.

impl<T, S, B> ChangesetOp<'_, T, S, B>

where Value<S, B>: PartialEq,

pub fn changed_column_indices(&self) -> impl Iterator<Item = usize>

Returns the indices of the columns whose pairs are ChangesetUpdatePairExt::is_changed, and nothing for a non-UPDATE.

impl<T: SchemaWithPK, S: Clone, B: Clone> ChangesetOp<'_, T, S, B>

pub fn primary_key(&self) -> Vec<Value<S, B>>

Returns the primary-key cells of this operation, in key order.

Insert and Delete read the key from the full row via SchemaWithPK::extract_pk. For Update each key cell is taken old-first: a changeset UPDATE carries the key in the old slot as the row identity, while the new slot is absent for a key column that did not change, so reading the new slot (as extract_pk would over the pair storage) can yield None.

Trait Implementations

impl<'a, T: Debug, S: Debug, B: Debug> Debug for ChangesetOp<'a, T, S, B>

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

Formats the value using the given formatter.