mirror of
https://github.com/rbock/sqlpp11.git
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210 lines
6.8 KiB
C++
210 lines
6.8 KiB
C++
/*
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* Copyright (c) 2013-2014, 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_FROM_H
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#define SQLPP_FROM_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/logic.h>
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#include <sqlpp11/policy_update.h>
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namespace sqlpp
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{
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// FROM DATA
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template<typename Database, typename... Tables>
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struct from_data_t
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{
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from_data_t(Tables... tables):
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_tables(tables...)
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{}
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from_data_t(const from_data_t&) = default;
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from_data_t(from_data_t&&) = default;
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from_data_t& operator=(const from_data_t&) = default;
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from_data_t& operator=(from_data_t&&) = default;
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~from_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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// FROM
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template<typename Database, typename... Tables>
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struct from_t
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{
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using _traits = make_traits<no_value_t, ::sqlpp::tag::from>;
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using _recursive_traits = make_recursive_traits<Tables...>;
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using _is_dynamic = typename std::conditional<std::is_same<Database, void>::value, std::false_type, std::true_type>::type;
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static_assert(_is_dynamic::value or sizeof...(Tables), "at least one table or join argument required in from()");
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// FIXME: Joins contain two tables. This is not being dealt with at the moment when looking at duplicates, for instance
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static_assert(not ::sqlpp::detail::has_duplicates<Tables...>::value, "at least one duplicate argument detected in from()");
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static_assert(::sqlpp::detail::all_t<is_table_t<Tables>::value...>::value, "at least one argument is not a table or join in from()");
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static_assert(required_tables_of<from_t>::size::value == 0, "at least one table depends on another table");
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// Data
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using _data_t = from_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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template<typename Table>
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void add(Table table)
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{
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static_assert(_is_dynamic::value, "from::add() must not be called for static from()");
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static_assert(is_table_t<Table>::value, "invalid table argument in from::add()");
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#warning need to check if table is already known
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using ok = ::sqlpp::detail::all_t<_is_dynamic::value, is_table_t<Table>::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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// Member template for adding the named member to a statement
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template<typename Policies>
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struct _member_t
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{
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using _data_t = from_data_t<Database, Tables...>;
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_impl_t<Policies> from;
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_impl_t<Policies>& operator()() { return from; }
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const _impl_t<Policies>& operator()() const { return from; }
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template<typename T>
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static auto _get_member(T t) -> decltype(t.from)
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{
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return t.from;
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}
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};
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// Additional methods for the statement
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template<typename Policies>
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struct _methods_t
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{
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};
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};
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struct no_from_t
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{
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using _traits = make_traits<no_value_t, ::sqlpp::tag::noop>;
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using _recursive_traits = make_recursive_traits<>;
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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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_data_t _data;
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};
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// Member template for adding the named member to a statement
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template<typename Policies>
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struct _member_t
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{
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using _data_t = no_data_t;
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_impl_t<Policies> no_from;
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_impl_t<Policies>& operator()() { return no_from; }
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const _impl_t<Policies>& operator()() const { return no_from; }
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template<typename T>
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static auto _get_member(T t) -> decltype(t.no_from)
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{
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return t.no_from;
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}
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};
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// Additional methods for the statement
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template<typename Policies>
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struct _methods_t
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{
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using _database_t = typename Policies::_database_t;
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template<typename T>
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using _new_statement_t = typename Policies::template _new_statement_t<no_from_t, T>;
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template<typename... Args>
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auto from(Args... args)
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-> _new_statement_t<from_t<void, Args...>>
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{
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return { *static_cast<typename Policies::_statement_t*>(this), from_data_t<void, Args...>{args...} };
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}
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template<typename... Args>
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auto dynamic_from(Args... args)
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-> _new_statement_t<from_t<_database_t, Args...>>
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{
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static_assert(not std::is_same<_database_t, void>::value, "dynamic_from must not be called in a static statement");
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return { *static_cast<typename Policies::_statement_t*>(this), from_data_t<_database_t, 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, from_data_t<Database, Tables...>>
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{
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using T = from_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 << " FROM ";
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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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