Trait odbc_api::buffers::ColumnBuffer

source · [−]
pub unsafe trait ColumnBuffer: for<'a> ColumnProjections<'a> + CDataMut {
    unsafe fn view(
        &self, 
        valid_rows: usize
    ) -> <Self as ColumnProjections<'_>>::View;

    unsafe fn view_mut(
        &mut self, 
        valid_rows: usize
    ) -> <Self as ColumnProjections<'_>>::ViewMut;

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

    fn capacity(&self) -> usize;
}
Expand description

A buffer able to be used together with ColumnarBuffer.

Safety

Views must not allow access to unintialized / invalid rows.

Required methods

Safety

Underlying buffer may not know how many elements have been written to it by the last ODBC function call. So we tell it how many, and get a save to use view in Return. Specifying an erroneous value for valid_rows, may therfore result in the construced view giving us access to invalid rows in a safe abstraction, which of course would be a Bug.

Safety

valid_rows must be valid, otherwise the safe abstraction would provide access to invalid memory.

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

Current capacity of the column

Implementors