Struct diesel::expression::helper_types::IsNull

pub struct IsNull<T> { /* fields omitted */ }

Methods

impl<T> IsNull<T>

fn new(expr: T) -> Self

Trait Implementations

impl<T: Debug> Debug for IsNull<T>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<T: Clone> Clone for IsNull<T>

fn clone(&self) -> IsNull<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Copy> Copy for IsNull<T>

impl<T> QueryId for IsNull<T> where
    T: QueryId, 

type QueryId = IsNull<T::QueryId>

fn has_static_query_id() -> bool

fn query_id() -> Option<TypeId>

impl<T, QS> SelectableExpression<QS> for IsNull<T> where
    IsNull<T>: AppearsOnTable<QS>,
    T: SelectableExpression<QS>, 

impl<T, QS> AppearsOnTable<QS> for IsNull<T> where
    IsNull<T>: Expression,
    T: AppearsOnTable<QS>, 

impl<T> Expression for IsNull<T> where
    T: Expression, 

type SqlType = Bool

impl<T, DB> QueryFragment<DB> for IsNull<T> where
    DB: Backend,
    T: QueryFragment<DB>, 

fn walk_ast(&self, out: AstPass<DB>) -> QueryResult<()>

fn to_sql(&self, out: &mut DB::QueryBuilder) -> QueryResult<()>

fn collect_binds(&self, out: &mut DB::BindCollector) -> QueryResult<()>

fn is_safe_to_cache_prepared(&self) -> QueryResult<bool>

impl<T> NonAggregate for IsNull<T> where
    T: NonAggregate,