mirror of
https://github.com/rbock/sqlpp11.git
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264 lines
8.4 KiB
C++
264 lines
8.4 KiB
C++
/*
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* Copyright (c) 2013-2015, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_USING_H
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#define SQLPP_USING_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/interpretable_list.h>
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#include <sqlpp11/interpret_tuple.h>
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#include <sqlpp11/detail/type_set.h>
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#include <sqlpp11/policy_update.h>
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namespace sqlpp
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{
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// USING DATA
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template <typename Database, typename... Tables>
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struct using_data_t
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{
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using_data_t(Tables... tables) : _tables(tables...)
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{
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}
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using_data_t(const using_data_t&) = default;
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using_data_t(using_data_t&&) = default;
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using_data_t& operator=(const using_data_t&) = default;
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using_data_t& operator=(using_data_t&&) = default;
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~using_data_t() = default;
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std::tuple<Tables...> _tables;
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interpretable_list_t<Database> _dynamic_tables;
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};
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// USING
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template <typename Database, typename... Tables>
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struct using_t
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{
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using _traits = make_traits<no_value_t, tag::is_using_>;
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using _nodes = detail::type_vector<Tables...>;
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using _is_dynamic = is_database<Database>;
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// Data
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using _data_t = using_data_t<Database, Tables...>;
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// Member implementation with data and methods
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template <typename Policies>
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struct _impl_t
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{
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2173269
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_impl_t() = default;
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_impl_t(const _data_t& data) : _data(data)
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{
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}
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template <typename Table>
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void add(Table table)
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{
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static_assert(_is_dynamic::value, "add must not be called for static using()");
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static_assert(is_table_t<Table>::value, "invalid table argument in add()");
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using _serialize_check = sqlpp::serialize_check_t<typename Database::_serializer_context_t, Table>;
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_serialize_check::_();
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using ok = logic::all_t<_is_dynamic::value, is_table_t<Table>::value, _serialize_check::type::value>;
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_add_impl(table, ok()); // dispatch to prevent compile messages after the static_assert
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}
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private:
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template <typename Table>
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void _add_impl(Table table, const std::true_type&)
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{
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return _data._dynamic_tables.emplace_back(table);
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}
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template <typename Table>
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void _add_impl(Table table, const std::false_type&);
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public:
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_data_t _data;
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};
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// Base template to be inherited by the statement
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template <typename Policies>
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struct _base_t
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{
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using _data_t = using_data_t<Database, Tables...>;
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2173269
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template <typename... Args>
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_base_t(Args&&... args)
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: using_{std::forward<Args>(args)...}
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{
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}
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_impl_t<Policies> using_;
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_impl_t<Policies>& operator()()
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{
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return using_;
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}
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const _impl_t<Policies>& operator()() const
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{
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return using_;
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}
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template <typename T>
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static auto _get_member(T t) -> decltype(t.using_)
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{
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return t.using_;
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}
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// FIXME: Maybe check for unused tables, similar to from
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using _consistency_check = consistent_t;
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};
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};
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// NO USING YET
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struct no_using_t
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{
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using _traits = make_traits<no_value_t, tag::is_where>;
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using _nodes = detail::type_vector<>;
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// Data
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using _data_t = no_data_t;
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// Member implementation with data and methods
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template <typename Policies>
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struct _impl_t
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{
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2173269
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_impl_t() = default;
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_impl_t(const _data_t& data) : _data(data)
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{
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}
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_data_t _data;
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};
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// Base template to be inherited by the statement
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template <typename Policies>
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struct _base_t
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{
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using _data_t = no_data_t;
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2173269
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template <typename... Args>
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_base_t(Args&&... args)
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: no_using{std::forward<Args>(args)...}
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{
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}
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_impl_t<Policies> no_using;
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_impl_t<Policies>& operator()()
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{
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return no_using;
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}
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const _impl_t<Policies>& operator()() const
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{
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return no_using;
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}
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template <typename T>
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static auto _get_member(T t) -> decltype(t.no_using)
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{
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return t.no_using;
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}
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using _database_t = typename Policies::_database_t;
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2173269
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// template <typename... T>
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// using _check = logic::all_t<is_table_t<T>::value...>;
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template <typename... T>
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struct _check : logic::all_t<is_table_t<T>::value...>
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{
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};
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template <typename Check, typename T>
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using _new_statement_t = new_statement_t<Check::value, Policies, no_using_t, T>;
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using _consistency_check = consistent_t;
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template <typename... Args>
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auto using_(Args... args) const -> _new_statement_t<_check<Args...>, using_t<void, Args...>>
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{
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static_assert(not detail::has_duplicates<Args...>::value,
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"at least one duplicate argument detected in using()");
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static_assert(sizeof...(Args), "at least one table required in using()");
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static_assert(_check<Args...>::value, "at least one argument is not an table in using()");
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return {_using_impl<void>(_check<Args...>{}, args...)};
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}
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template <typename... Args>
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auto dynamic_using(Args... args) const -> _new_statement_t<_check<Args...>, using_t<_database_t, Args...>>
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{
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static_assert(not std::is_same<_database_t, void>::value,
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"dynamic_using must not be called in a static statement");
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static_assert(_check<Args...>::value, "at least one argument is not an table in using()");
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return {_using_impl<_database_t>(_check<Args...>{}, args...)};
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}
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private:
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template <typename Database, typename... Args>
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auto _using_impl(const std::false_type&, Args... args) const -> bad_statement;
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template <typename Database, typename... Args>
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auto _using_impl(const std::true_type&, Args... args) const
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-> _new_statement_t<std::true_type, using_t<_database_t, Args...>>
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{
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static_assert(not detail::has_duplicates<Args...>::value,
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"at least one duplicate argument detected in using()");
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return {static_cast<const derived_statement_t<Policies>&>(*this), using_data_t<Database, Args...>{args...}};
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}
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};
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};
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// Interpreters
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template <typename Context, typename Database, typename... Tables>
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struct serializer_t<Context, using_data_t<Database, Tables...>>
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{
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using _serialize_check = serialize_check_of<Context, Tables...>;
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using T = using_data_t<Database, Tables...>;
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static Context& _(const T& t, Context& context)
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{
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if (sizeof...(Tables) == 0 and t._dynamic_tables.empty())
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return context;
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context << " USING ";
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interpret_tuple(t._tables, ',', context);
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if (sizeof...(Tables) and not t._dynamic_tables.empty())
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context << ',';
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interpret_list(t._dynamic_tables, ',', context);
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return context;
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}
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};
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}
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#endif
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