subselect.rs - source

Files

aho_corasick

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bigdecimal

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connection

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macros

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migration

errors.rs mod.rs

mysql

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expression

extensions

interval_dsl.rs mod.rs

array.rs array_comparison.rs date_and_time.rs expression_methods.rs helper_types.rs mod.rs operators.rs

query_builder

distinct_on.rs mod.rs query_fragment_impls.rs

serialize

mod.rs write_tuple.rs

types

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chrono.rs deprecated_time.rs mod.rs quickcheck_impls.rs std_time.rs

floats

mod.rs quickcheck_impls.rs

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upsert

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query_builder

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insert_statement

column_list.rs insert_from_select.rs mod.rs

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select_statement

boxed.rs dsl_impls.rs mod.rs

update_statement

changeset.rs mod.rs target.rs

ast_pass.rs bind_collector.rs clause_macro.rs debug_query.rs distinct_clause.rs functions.rs group_by_clause.rs limit_clause.rs locking_clause.rs mod.rs offset_clause.rs order_clause.rs query_id.rs returning_clause.rs select_clause.rs sql_query.rs where_clause.rs

query_dsl

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query_source

joins.rs mod.rs peano_numbers.rs

sql_types

fold.rs mod.rs ops.rs ord.rs

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chrono.rs mod.rs

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types

backend.rs data_types.rs deserialize.rs insertable.rs lib.rs r2d2.rs result.rs row.rs serialize.rs util.rs

diesel_derives

as_changeset.rs as_expression.rs associations.rs diagnostic_shim.rs diesel_numeric_ops.rs field.rs from_sql_row.rs identifiable.rs insertable.rs lib.rs meta.rs model.rs query_id.rs queryable.rs queryable_by_name.rs resolved_at_shim.rs sql_type.rs util.rs

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log

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mysqlclient_sys

bindings_macos.rs lib.rs

num_bigint

algorithms.rs bigint.rs biguint.rs lib.rs macros.rs monty.rs

num_integer

average.rs lib.rs roots.rs

num_traits

ops

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bounds.rs cast.rs float.rs identities.rs int.rs lib.rs macros.rs pow.rs real.rs sign.rs

parking_lot

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smallvec

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tinyvec

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generated_impl.rs

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char_data

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unicode_normalization

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unicode_xid

lib.rs tables.rs

url

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utf8_ranges

char_utf8.rs lib.rs

uuid

adapter

builder

error.rs mod.rs

parser

error.rs mod.rs

error.rs lib.rs prelude.rs

winapi

use std::marker::PhantomData;

use expression::array_comparison::MaybeEmpty;
use expression::*;
use query_builder::*;
use result::QueryResult;

#[derive(Debug, Copy, Clone, QueryId)]
pub struct Subselect<T, ST> {
    values: T,
    _sql_type: PhantomData<ST>,
}

impl<T, ST> Subselect<T, ST> {
    pub(crate) fn new(values: T) -> Self {
        Self {
            values,
            _sql_type: PhantomData,
        }
    }
}

impl<T: SelectQuery, ST> Expression for Subselect<T, ST> {
    type SqlType = ST;
}

impl<T, ST> MaybeEmpty for Subselect<T, ST> {
    fn is_empty(&self) -> bool {
        false
    }
}

impl<T, ST, QS> SelectableExpression<QS> for Subselect<T, ST>
where
    Subselect<T, ST>: AppearsOnTable<QS>,
    T: ValidSubselect<QS>,
{
}

impl<T, ST, QS> AppearsOnTable<QS> for Subselect<T, ST>
where
    Subselect<T, ST>: Expression,
    T: ValidSubselect<QS>,
{
}

impl<T, ST> NonAggregate for Subselect<T, ST> {}

impl<T, ST, DB> QueryFragment<DB> for Subselect<T, ST>
where
    DB: Backend,
    T: QueryFragment<DB>,
{
    fn walk_ast(&self, mut out: AstPass<DB>) -> QueryResult<()> {
        self.values.walk_ast(out.reborrow())?;
        Ok(())
    }
}

pub trait ValidSubselect<QS> {}