Struct ChangesetRow 

pub struct ChangesetRow {
    pub op: ChangeOp,
    pub old_values: Vec<ChangesetValue>,
    pub new_values: Vec<ChangesetValue>,
}

A single row change recorded in a changeset.

Fields

op: ChangeOp

old_values: Vec<ChangesetValue>

For DELETE and UPDATE: the old column values. Empty for INSERT.

new_values: Vec<ChangesetValue>

For INSERT and UPDATE: the new column values. Empty for DELETE.

Implementations

impl ChangesetRow

pub fn encode_changeset(&self, out: &mut Vec<u8>)

Encode this row change into changeset binary format.

pub fn encode_patchset(&self, out: &mut Vec<u8>, pk_flags: &[bool])

Encode this row change into patchset binary format.

For INSERT and DELETE this is identical to changeset encoding. For UPDATE the patchset stores a single record whose PK slots contain the original key values and whose non-PK slots contain changed new values or ChangesetValue::Undefined for unchanged columns.

pub fn decode_changeset( data: &[u8], pos: usize, col_count: usize, ) -> Option<(Self, usize)>

Decode one changeset row starting at pos, given the column count.

pub fn decode_patchset( data: &[u8], pos: usize, col_count: usize, pk_flags: &[bool], ) -> Option<(Self, usize)>

Decode one patchset row starting at pos.

Patchset UPDATE rows only store primary-key old values. Non-PK old values are reconstructed as ChangesetValue::Undefined so the decoded row can reuse the normal apply path.

pub fn invert(&self) -> Self

Invert this change: INSERT becomes DELETE, DELETE becomes INSERT, UPDATE swaps old and new values.

Trait Implementations

impl Clone for ChangesetRow

fn clone(&self) -> ChangesetRow

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChangesetRow

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

Formats the value using the given formatter.

impl PartialEq for ChangesetRow

fn eq(&self, other: &ChangesetRow) -> 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 ChangesetRow