Trait odbc_api::buffers::ColumnBuffer

pub unsafe trait ColumnBuffer: CDataMut {
    type View<'a>
    where
        Self: 'a;

    fn view(&self, valid_rows: usize) -> Self::View<'_>;
    fn fill_default(&mut self, from: usize, to: usize);
    fn capacity(&self) -> usize;
}

A buffer for a single column intended to be used together with ColumnarBuffer.

Safety

Views must not allow access to unintialized / invalid rows.

Required Associated Types

type View<'a>
where
    Self: 'a

Immutable view on the column data. Used in safe abstractions. User must not be able to access uninitialized or invalid memory of the buffer through this interface.

Required Methods

fn view(&self, valid_rows: usize) -> Self::View<'_>

Num rows may not exceed the actually amount of valid num_rows filled be the ODBC API. The column buffer does not know how many elements were in the last row group, and therefore can not guarantee the accessed element to be valid and in a defined state. It also can not panic on accessing an undefined element.

fn fill_default(&mut self, from: usize, to: usize)

Fills the column with the default representation of values, between from and to index.

fn capacity(&self) -> usize

Current capacity of the column

Implementations on Foreign Types

impl<T> ColumnBuffer for Vec<T>where
    T: Pod,

type View<'a> = &'a [T]

fn view(&self, valid_rows: usize) -> &[T]

fn fill_default(&mut self, from: usize, to: usize)

fn capacity(&self) -> usize

Implementors

impl ColumnBuffer for AnyBuffer

type View<'a> = AnySlice<'a>

impl<C: 'static> ColumnBuffer for TextColumn<C>where
    TextColumn<C>: CDataMut + HasDataType,

type View<'a> = TextColumnView<'a, C>

impl<T> ColumnBuffer for WithDataType<T>where
    T: ColumnBuffer,

type View<'a>
where
    T: 'a = <T as ColumnBuffer>::View<'a>