Trait DbCursorRW

pub trait DbCursorRW<T: Table> {
    // Required methods
    fn upsert(
        &mut self,
        key: T::Key,
        value: T::Value,
    ) -> Result<(), DatabaseError>;
    fn insert(
        &mut self,
        key: T::Key,
        value: T::Value,
    ) -> Result<(), DatabaseError>;
    fn append(
        &mut self,
        key: T::Key,
        value: T::Value,
    ) -> Result<(), DatabaseError>;
    fn delete_current(&mut self) -> Result<(), DatabaseError>;
}

Read write cursor over table.

Required Methods

fn upsert(&mut self, key: T::Key, value: T::Value) -> Result<(), DatabaseError>

Database operation that will update an existing row if a specified value already exists in a table, and insert a new row if the specified value doesn’t already exist

fn insert(&mut self, key: T::Key, value: T::Value) -> Result<(), DatabaseError>

Database operation that will insert a row at a given key. If the key is already present, the operation will result in an error.

fn append(&mut self, key: T::Key, value: T::Value) -> Result<(), DatabaseError>

Append value to next cursor item.

This is efficient for pre-sorted data. If the data is not pre-sorted, use DbCursorRW::insert.

fn delete_current(&mut self) -> Result<(), DatabaseError>

Delete current value that cursor points to

Implementors

impl<T: Table> DbCursorRW<T> for CursorMock