Trait diesel::query_builder::Query

[+] Show declaration

pub trait Query {
    type SqlType;
}

[−] Expand description

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.

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

[−] Expand description

type SqlType = T::SqlType

Implementors

• impl<ST, T> Query for SqlLiteral<ST, T> type SqlType = ST;

• impl<Q, Value> Query for UncheckedBind<Q, Value> where     Q: Query,  type SqlType = Q::SqlType;

• impl<T, U, Ret> Query for DeleteStatement<T, U, ReturningClause<Ret>> where     T: Table,     Ret: SelectableExpression<T>,  type SqlType = Ret::SqlType;

• impl<T, U, Op, Ret> Query for InsertStatement<T, U, Op, ReturningClause<Ret>> where     Ret: Expression + SelectableExpression<T> + NonAggregate,  type SqlType = Ret::SqlType;

• 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;