Trait Column

pub trait Column: Debug + Send {
    // Required methods
    fn get(&self, index: usize) -> RealmResult<Value>;
    fn is_null(&self, index: usize) -> RealmResult<bool>;
    fn count(&self) -> RealmResult<usize>;
    fn nullable(&self) -> bool;
    fn is_indexed(&self) -> bool;
    fn get_row_number_by_index(
        &self,
        lookup_value: &Value,
    ) -> RealmResult<Option<usize>>;
    fn name(&self) -> Option<&str>;
}

A column for a table.

Required Methods

fn get(&self, index: usize) -> RealmResult<Value>

Get the value for this column for the row with the given index.

fn is_null(&self, index: usize) -> RealmResult<bool>

Check whether the value at the given index is null. Note that some column types are never null, see Value for details.

fn count(&self) -> RealmResult<usize>

Get the total number of values in this column.

fn nullable(&self) -> bool

Get whether this column is nullable. Note that some column types are never null, see Value for details.

fn is_indexed(&self) -> bool

Is this column indexed? If so, you can use table.find_row_from_indexed_column to find rows by a known value based on this column.

fn get_row_number_by_index( &self, lookup_value: &Value, ) -> RealmResult<Option<usize>>

Look up a value for this column in the index.

Panics if this column is not indexed.

fn name(&self) -> Option<&str>

Get the name of this column. All columns except backlinks are named.

Implementors