Trait diesel::query_builder::AsQuery[−][src]

pub trait AsQuery {
    type SqlType;
    type Query: Query<SqlType = Self::SqlType>;
    fn as_query(self) -> Self::Query;
}

Types that can be converted into a complete, typed SQL query.

This is used internally to automatically add the right select clause when none is specified, or to automatically add RETURNING * in certain contexts.

A type which implements this trait is guaranteed to be valid for execution.

Associated Types

`type SqlType`

The SQL type of Self::Query

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

What kind of query does this type represent?

Required Methods

`fn as_query(self) -> Self::Query`

Converts a type which semantically represents a SQL query into the actual query being executed. See the trait level docs for more.

Implementors

impl<T, U> AsQuery for DeleteStatement<T, U, NoReturningClause> where
    T: Table,
    T::AllColumns: SelectableExpression<T>,
    DeleteStatement<T, U, ReturningClause<T::AllColumns>>: Query,   type SqlType = <Self::Query as Query>::SqlType;  type Query = DeleteStatement<T, U, ReturningClause<T::AllColumns>>;

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impl<T, U, Op> AsQuery for InsertStatement<T, U, Op, NoReturningClause> where
    T: Table,
    InsertStatement<T, U, Op, ReturningClause<T::AllColumns>>: Query,   type SqlType = <Self::Query as Query>::SqlType;  type Query = InsertStatement<T, U, Op, ReturningClause<T::AllColumns>>;

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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>>;

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impl<T: Query> AsQuery for T type SqlType = Self::SqlType; type Query = Self;
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