Struct DatabaseOverlay 

pub struct DatabaseOverlay { /* private fields */ }

Manages uncommitted changes during a transaction.

Provides an overlay over the existing database state to track uncommitted inserts, updates, and deletes per table.

Implementations

impl DatabaseOverlay

pub fn reader<'a, T, MA>( &'a mut self, table_reader: TableReader<'a, T, MA>, ) -> DatabaseOverlayReader<'a, T, MA>

where T: TableSchema, MA: MemoryAccess,

Returns a reader that merges base table data with overlay changes.

pub fn insert<T>(&mut self, values: Vec<(ColumnDef, Value)>) -> DbmsResult<()>

where T: TableSchema,

Inserts a record into the overlay for the specified table.

pub fn update<T>(&mut self, pk: Value, updates: Vec<(&'static str, Value)>)

where T: TableSchema,

Updates a record in the overlay for the specified table.

pub fn delete<T>(&mut self, pk: Value)

where T: TableSchema,

Deletes a record in the overlay for the specified table.

Trait Implementations

impl Clone for DatabaseOverlay

fn clone(&self) -> DatabaseOverlay

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DatabaseOverlay

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

Formats the value using the given formatter.

impl Default for DatabaseOverlay

fn default() -> DatabaseOverlay

Returns the “default value” for a type.