Trait Query

pub trait Query {
    type SqlType;
}

A complete SQL query with a return type.

This can be a select statement, or a command such as update or insert with a RETURNING clause. Unlike Expression, types implementing this trait are guaranteed to be executable on their own.

A type which doesn’t implement this trait may still represent a complete SQL query. For example, an INSERT statement without a RETURNING clause will not implement this trait, but can still be executed.

Required Associated Types

type SqlType

The SQL type that this query represents.

This is the SQL type of the SELECT clause for select statements, and the SQL type of the RETURNING clause for insert, update, or delete statements.

Implementations on Foreign Types

impl<'a, T: Query> Query for &'a T

type SqlType = <T as Query>::SqlType

Implementors

impl<'a, ST, QS, DB, GB> Query for BoxedSelectStatement<'a, ST, QS, DB, GB>

where DB: Backend,

type SqlType = ST

impl<DB, Q> Query for BoxedSqlQuery<'_, DB, Q>

where DB: Backend,

type SqlType = Untyped

impl<F, S, D, W, O, LOf, G, H, LC> Query for SelectStatement<F, S, D, W, O, LOf, G, H, LC>

where G: ValidGroupByClause, S: SelectClauseExpression<F>, S::Selection: ValidGrouping<G::Expressions>, W: ValidWhereClause<F>,

type SqlType = <S as SelectClauseExpression<F>>::SelectClauseSqlType

impl<Inner> Query for SqlQuery<Inner>

type SqlType = Untyped

impl<Q, Value> Query for UncheckedBind<Q, Value>

where Q: Query,

type SqlType = <Q as Query>::SqlType

impl<ST, T> Query for SqlLiteral<ST, T>

where Self: Expression,

type SqlType = ST

impl<T> Query for CollectedQuery<T>

type SqlType = Untyped

impl<T, U, Op, Ret> Query for InsertStatement<T, U, Op, ReturningClause<Ret>>

where T: QuerySource, Ret: Expression + SelectableExpression<T> + NonAggregate,

type SqlType = <Ret as Expression>::SqlType

impl<T, U, Ret> Query for DeleteStatement<T, U, ReturningClause<Ret>>

where T: Table, Ret: SelectableExpression<T>,

type SqlType = <Ret as Expression>::SqlType

impl<T, U, V, Ret> Query for UpdateStatement<T, U, V, ReturningClause<Ret>>

where T: Table, Ret: Expression + SelectableExpression<T> + ValidGrouping<()>, Ret::IsAggregate: MixedAggregates<No, Output = No>,

type SqlType = <Ret as Expression>::SqlType