Trait BlockExt

pub trait BlockExt: Debug + Sized {
    // Required methods
    fn num_of_rows(&self) -> usize;
    fn fields(&self) -> &[Field];
    fn precision(&self) -> Precision;
    fn is_null(&self, row: usize, col: usize) -> bool;
    unsafe fn cell_unchecked(
        &self,
        row: usize,
        col: usize,
    ) -> (&Field, BorrowedValue<'_>);
    unsafe fn get_col_unchecked(&self, col: usize) -> &ColumnView;

    // Provided methods
    fn field_count(&self) -> usize { ... }
    unsafe fn get_field_unchecked(&self, col: usize) -> &Field { ... }
    fn get_field(&self, col: usize) -> Option<&Field> { ... }
    fn columns_iter(&self) -> ColsIter<'_, Self>  { ... }
}

Trait to define a data Block to fetch records bulky.

If query performance is not your main concern, you can just use the deserialize method from result set.

Required Methods

fn num_of_rows(&self) -> usize

A block should container number of rows.

fn fields(&self) -> &[Field]

Fields can be queried from a block.

fn precision(&self) -> Precision

fn is_null(&self, row: usize, col: usize) -> bool

unsafe fn cell_unchecked( &self, row: usize, col: usize, ) -> (&Field, BorrowedValue<'_>)

Safety

DO NOT call it directly.

unsafe fn get_col_unchecked(&self, col: usize) -> &ColumnView

Safety

DO NOT call it directly.

Provided Methods

fn field_count(&self) -> usize

Number of fields.

unsafe fn get_field_unchecked(&self, col: usize) -> &Field

Get field without column index check.

Safety

This should not be called manually, please use get_field.

fn get_field(&self, col: usize) -> Option<&Field>

Get field of one column.

fn columns_iter(&self) -> ColsIter<'_, Self>

Query by rows. Consume self into rows. Columns iterator with borrowed data from block.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors