Struct Session 

pub struct Session { /* private fields */ }

A session that records database changes for later extraction as a changeset or patchset.

In a real database engine this would hook into the DML pipeline. For now it provides a programmatic API for recording changes and generating the binary changeset/patchset encoding.

Implementations

impl Session

pub fn new() -> Self

Create a new, empty session.

pub fn attach_table( &mut self, name: &str, column_count: usize, pk_flags: Vec<bool>, )

Attach a table for change tracking.

pk_flags indicates which columns are part of the primary key.

SQLite session changesets only track tables with an explicit primary key. Attached tables with no key columns are ignored when generating changesets or patchsets.

pub fn record_insert(&mut self, table: &str, new_values: Vec<ChangesetValue>)

Record an INSERT operation.

pub fn record_delete(&mut self, table: &str, old_values: Vec<ChangesetValue>)

Record a DELETE operation.

pub fn record_update( &mut self, table: &str, old_values: Vec<ChangesetValue>, new_values: Vec<ChangesetValue>, )

Record an UPDATE operation.

old_values and new_values must have the same length. Use ChangesetValue::Undefined for columns that did not change.

pub fn changeset(&self) -> Changeset

Generate a Changeset from all recorded changes.

pub fn patchset(&self) -> Vec<u8>

Generate a patchset (compact binary format).

Trait Implementations

impl Debug for Session

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

Formats the value using the given formatter.

impl Default for Session

fn default() -> Self

Returns the “default value” for a type.