pub unsafe trait ColumnBuffer: for<'a> ColumnProjections<'a> + CDataMut {
// Required methods
fn view(&self, valid_rows: usize) -> Self::View;
fn fill_default(&mut self, from: usize, to: usize);
fn capacity(&self) -> usize;
}Expand description
A buffer for a single column intended to be used together with ColumnarBuffer.
§Safety
Views must not allow access to unintialized / invalid rows.
Required Methods§
Sourcefn view(&self, valid_rows: usize) -> Self::View
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.
Sourcefn fill_default(&mut self, from: usize, to: usize)
fn fill_default(&mut self, from: usize, to: usize)
Fills the column with the default representation of values, between from and to index.