Struct diesel::expression::expression_types::Untyped

pub struct Untyped;

Query nodes with this expression type do not have a statically at compile time known expression type.

An example for such a query node in diesel itself, is sql_query as we do not know which fields are returned from such a query at compile time.

For loading values from queries returning a type of this expression, consider using #[derive(QueryableByName)] on the corresponding result type.

Trait Implementations

impl Clone for Untyped

fn clone(&self) -> Untyped

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Untyped

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<DB, T> FromSqlRow<Untyped, DB> for Twhere
    DB: Backend,
    T: QueryableByName<DB>,

fn build_from_row<'a>(row: &impl Row<'a, DB>) -> Result<Self>

See the trait documentation.

impl<DB: Backend> QueryMetadata<Untyped> for DB

fn row_metadata(
    _: &mut DB::MetadataLookup,
    row: &mut Vec<Option<DB::TypeMetadata>>
)

The exact return value of this function is considerded to be a backend specific implementation detail. You should not rely on those values if you not own the corresponding backend

impl Copy for Untyped

impl TypedExpressionType for Untyped