mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-11-16 21:04:15 +08:00
288 lines
10 KiB
C++
288 lines
10 KiB
C++
/*
|
|
* Copyright (c) 2013-2016, Roland Bock
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without modification,
|
|
* are permitted provided that the following conditions are met:
|
|
*
|
|
* Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* Redistributions in binary form must reproduce the above copyright notice, this
|
|
* list of conditions and the following disclaimer in the documentation and/or
|
|
* other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef SQLPP_GROUP_BY_H
|
|
#define SQLPP_GROUP_BY_H
|
|
|
|
#include <sqlpp11/expression.h>
|
|
#include <sqlpp11/interpret_tuple.h>
|
|
#include <sqlpp11/interpretable_list.h>
|
|
#include <sqlpp11/logic.h>
|
|
#include <sqlpp11/policy_update.h>
|
|
#include <sqlpp11/type_traits.h>
|
|
#include <tuple>
|
|
|
|
namespace sqlpp
|
|
{
|
|
// GROUP BY DATA
|
|
template <typename Database, typename... Expressions>
|
|
struct group_by_data_t
|
|
{
|
|
group_by_data_t(Expressions... expressions) : _expressions(expressions...)
|
|
{
|
|
}
|
|
|
|
group_by_data_t(const group_by_data_t&) = default;
|
|
group_by_data_t(group_by_data_t&&) = default;
|
|
group_by_data_t& operator=(const group_by_data_t&) = default;
|
|
group_by_data_t& operator=(group_by_data_t&&) = default;
|
|
~group_by_data_t() = default;
|
|
|
|
std::tuple<Expressions...> _expressions;
|
|
interpretable_list_t<Database> _dynamic_expressions;
|
|
};
|
|
|
|
SQLPP_PORTABLE_STATIC_ASSERT(
|
|
assert_no_unknown_tables_in_group_by_t,
|
|
"at least one group-by expression requires a table which is otherwise not known in the statement");
|
|
|
|
// GROUP BY
|
|
template <typename Database, typename... Expressions>
|
|
struct group_by_t
|
|
{
|
|
using _traits = make_traits<no_value_t, tag::is_group_by>;
|
|
using _nodes = detail::type_vector<Expressions...>;
|
|
|
|
using _is_dynamic = is_database<Database>;
|
|
using _provided_aggregates = typename std::
|
|
conditional<_is_dynamic::value, detail::type_set<>, detail::make_type_set_t<Expressions...>>::type;
|
|
|
|
// Data
|
|
using _data_t = group_by_data_t<Database, Expressions...>;
|
|
|
|
// Member implementation with data and methods
|
|
template <typename Policies>
|
|
struct _impl_t
|
|
{
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
_impl_t() = default;
|
|
_impl_t(const _data_t& data) : _data(data)
|
|
{
|
|
}
|
|
|
|
template <typename Expression>
|
|
void add(Expression expression)
|
|
{
|
|
static_assert(_is_dynamic::value, "add() must not be called for static group_by");
|
|
static_assert(is_expression_t<Expression>::value, "invalid expression argument in group_by::add()");
|
|
static_assert(Policies::template _no_unknown_tables<Expression>::value,
|
|
"expression uses tables unknown to this statement in group_by::add()");
|
|
using _serialize_check = sqlpp::serialize_check_t<typename Database::_serializer_context_t, Expression>;
|
|
_serialize_check{};
|
|
|
|
using ok = logic::all_t<_is_dynamic::value, is_expression_t<Expression>::value, _serialize_check::type::value>;
|
|
|
|
_add_impl(expression, ok()); // dispatch to prevent compile messages after the static_assert
|
|
}
|
|
|
|
private:
|
|
template <typename Expression>
|
|
void _add_impl(Expression expression, const std::true_type&)
|
|
{
|
|
return _data._dynamic_expressions.emplace_back(expression);
|
|
}
|
|
|
|
template <typename Expression>
|
|
void _add_impl(Expression expression, const std::false_type&);
|
|
|
|
public:
|
|
_data_t _data;
|
|
};
|
|
|
|
// Base template to be inherited by the statement
|
|
template <typename Policies>
|
|
struct _base_t
|
|
{
|
|
using _data_t = group_by_data_t<Database, Expressions...>;
|
|
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
template <typename... Args>
|
|
_base_t(Args&&... args) : group_by{std::forward<Args>(args)...}
|
|
{
|
|
}
|
|
|
|
_impl_t<Policies> group_by;
|
|
_impl_t<Policies>& operator()()
|
|
{
|
|
return group_by;
|
|
}
|
|
const _impl_t<Policies>& operator()() const
|
|
{
|
|
return group_by;
|
|
}
|
|
|
|
template <typename T>
|
|
static auto _get_member(T t) -> decltype(t.group_by)
|
|
{
|
|
return t.group_by;
|
|
}
|
|
|
|
using _consistency_check = typename std::conditional<Policies::template _no_unknown_tables<group_by_t>::value,
|
|
consistent_t,
|
|
assert_no_unknown_tables_in_group_by_t>::type;
|
|
};
|
|
};
|
|
|
|
SQLPP_PORTABLE_STATIC_ASSERT(assert_group_by_args_are_expressions_t,
|
|
"arguments for group_by() must be valid expressions");
|
|
template <typename... Exprs>
|
|
struct check_group_by
|
|
{
|
|
using type = static_combined_check_t<
|
|
static_check_t<logic::all_t<is_expression_t<Exprs>::value...>::value, assert_group_by_args_are_expressions_t>>;
|
|
};
|
|
template <typename... Exprs>
|
|
using check_group_by_t = typename check_group_by<Exprs...>::type;
|
|
|
|
// NO GROUP BY YET
|
|
struct no_group_by_t
|
|
{
|
|
using _traits = make_traits<no_value_t, tag::is_noop>;
|
|
using _nodes = detail::type_vector<>;
|
|
|
|
// Data
|
|
using _data_t = no_data_t;
|
|
|
|
// Member implementation with data and methods
|
|
template <typename Policies>
|
|
struct _impl_t
|
|
{
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
_impl_t() = default;
|
|
_impl_t(const _data_t& data) : _data(data)
|
|
{
|
|
}
|
|
|
|
_data_t _data;
|
|
};
|
|
|
|
// Base template to be inherited by the statement
|
|
template <typename Policies>
|
|
struct _base_t
|
|
{
|
|
using _data_t = no_data_t;
|
|
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
template <typename... Args>
|
|
_base_t(Args&&... args) : no_group_by{std::forward<Args>(args)...}
|
|
{
|
|
}
|
|
|
|
_impl_t<Policies> no_group_by;
|
|
_impl_t<Policies>& operator()()
|
|
{
|
|
return no_group_by;
|
|
}
|
|
const _impl_t<Policies>& operator()() const
|
|
{
|
|
return no_group_by;
|
|
}
|
|
|
|
template <typename T>
|
|
static auto _get_member(T t) -> decltype(t.no_group_by)
|
|
{
|
|
return t.no_group_by;
|
|
}
|
|
|
|
using _database_t = typename Policies::_database_t;
|
|
|
|
template <typename Check, typename T>
|
|
using _new_statement_t = new_statement_t<Check, Policies, no_group_by_t, T>;
|
|
|
|
using _consistency_check = consistent_t;
|
|
|
|
template <typename... Expressions>
|
|
auto group_by(Expressions... expressions) const
|
|
-> _new_statement_t<check_group_by_t<Expressions...>, group_by_t<void, Expressions...>>
|
|
{
|
|
static_assert(sizeof...(Expressions), "at least one expression (e.g. a column) required in group_by()");
|
|
|
|
return _group_by_impl<void>(check_group_by_t<Expressions...>{}, expressions...);
|
|
}
|
|
|
|
template <typename... Expressions>
|
|
auto dynamic_group_by(Expressions... expressions) const
|
|
-> _new_statement_t<check_group_by_t<Expressions...>, group_by_t<_database_t, Expressions...>>
|
|
{
|
|
static_assert(not std::is_same<_database_t, void>::value,
|
|
"dynamic_group_by must not be called in a static statement");
|
|
|
|
return _group_by_impl<_database_t>(check_group_by_t<Expressions...>{}, expressions...);
|
|
}
|
|
|
|
private:
|
|
template <typename Database, typename Check, typename... Expressions>
|
|
auto _group_by_impl(Check, Expressions... expressions) const -> inconsistent<Check>;
|
|
|
|
template <typename Database, typename... Expressions>
|
|
auto _group_by_impl(consistent_t, Expressions... expressions) const
|
|
-> _new_statement_t<consistent_t, group_by_t<Database, Expressions...>>
|
|
{
|
|
static_assert(not detail::has_duplicates<Expressions...>::value,
|
|
"at least one duplicate argument detected in group_by()");
|
|
|
|
return {static_cast<const derived_statement_t<Policies>&>(*this),
|
|
group_by_data_t<Database, Expressions...>{expressions...}};
|
|
}
|
|
};
|
|
};
|
|
|
|
// Interpreters
|
|
template <typename Context, typename Database, typename... Expressions>
|
|
struct serializer_t<Context, group_by_data_t<Database, Expressions...>>
|
|
{
|
|
using _serialize_check = serialize_check_of<Context, Expressions...>;
|
|
using T = group_by_data_t<Database, Expressions...>;
|
|
|
|
static Context& _(const T& t, Context& context)
|
|
{
|
|
if (sizeof...(Expressions) == 0 and t._dynamic_expressions.empty())
|
|
return context;
|
|
context << " GROUP BY ";
|
|
interpret_tuple(t._expressions, ',', context);
|
|
if (sizeof...(Expressions) and not t._dynamic_expressions.empty())
|
|
context << ',';
|
|
interpret_list(t._dynamic_expressions, ',', context);
|
|
return context;
|
|
}
|
|
};
|
|
|
|
template <typename... T>
|
|
auto group_by(T&&... t) -> decltype(statement_t<void, no_group_by_t>().group_by(std::forward<T>(t)...))
|
|
{
|
|
return statement_t<void, no_group_by_t>().group_by(std::forward<T>(t)...);
|
|
}
|
|
|
|
template <typename Database, typename... T>
|
|
auto dynamic_group_by(const Database&, T&&... t)
|
|
-> decltype(statement_t<Database, no_group_by_t>().dynamic_group_by(std::forward<T>(t)...))
|
|
{
|
|
return statement_t<Database, no_group_by_t>().dynamic_group_by(std::forward<T>(t)...);
|
|
}
|
|
}
|
|
|
|
#endif
|