Struct diesel::query_builder::update_statement::UpdateStatement

pub struct UpdateStatement<T, U, V, Ret = NoReturningClause> { /* fields omitted */ }

Methods

impl<T, U, V> UpdateStatement<T, U, V, NoReturningClause>

fn returning<E>(
    self,
    returns: E
) -> UpdateStatement<T, U, V, ReturningClause<E>> where
    T: Table,
    UpdateStatement<T, U, V, ReturningClause<E>>: Query, 

Specify what expression is returned after execution of the update.

Examples

Updating a single record:

let updated_name = diesel::update(users.filter(id.eq(1)))
    .set(name.eq("Dean"))
    .returning(name)
    .get_result(&connection);
assert_eq!(Ok("Dean".to_string()), updated_name);

Trait Implementations

impl<T: Debug, U: Debug, V: Debug, Ret: Debug> Debug for UpdateStatement<T, U, V, Ret>

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

Formats the value using the given formatter.

impl<T: Copy, U: Copy, V: Copy, Ret: Copy> Copy for UpdateStatement<T, U, V, Ret>

impl<T: Clone, U: Clone, V: Clone, Ret: Clone> Clone for UpdateStatement<T, U, V, Ret>

fn clone(&self) -> UpdateStatement<T, U, V, Ret>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T, U, V, Ret, DB> QueryFragment<DB> for UpdateStatement<T, U, V, Ret> where
    DB: Backend,
    T: Table,
    T::FromClause: QueryFragment<DB>,
    U: QueryFragment<DB>,
    V: Changeset<DB>,
    Ret: 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,
    metadata_lookup: &DB::MetadataLookup
) -> QueryResult<()>

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

impl<T, U, V, Ret> QueryId for UpdateStatement<T, U, V, Ret>

type QueryId = ()

fn has_static_query_id() -> bool

fn query_id() -> Option<TypeId>

impl<T, U, V> AsQuery for UpdateStatement<T, U, V, NoReturningClause> where
    T: Table,
    UpdateStatement<T, U, V, ReturningClause<T::AllColumns>>: Query, 

type SqlType = <Self::Query as Query>::SqlType

type Query = UpdateStatement<T, U, V, ReturningClause<T::AllColumns>>

fn as_query(self) -> Self::Query

impl<T, U, V, Ret> Query for UpdateStatement<T, U, V, ReturningClause<Ret>> where
    T: Table,
    Ret: Expression + SelectableExpression<T> + NonAggregate, 

type SqlType = Ret::SqlType