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227 lines
8.2 KiB
C++
227 lines
8.2 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_UPDATE_LIST_H
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#define SQLPP_UPDATE_LIST_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/detail/type_set.h>
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#include <sqlpp11/interpret_tuple.h>
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#include <sqlpp11/interpretable_list.h>
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namespace sqlpp
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{
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// UPDATE ASSIGNMENTS DATA
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template<typename Database, typename... Assignments>
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struct update_list_data_t
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{
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update_list_data_t(Assignments... assignments):
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_assignments(assignments...)
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{}
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update_list_data_t(const update_list_data_t&) = default;
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update_list_data_t(update_list_data_t&&) = default;
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update_list_data_t& operator=(const update_list_data_t&) = default;
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update_list_data_t& operator=(update_list_data_t&&) = default;
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~update_list_data_t() = default;
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std::tuple<Assignments...> _assignments;
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interpretable_list_t<Database> _dynamic_assignments;
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};
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// UPDATE ASSIGNMENTS
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template<typename Database, typename... Assignments>
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struct update_list_t
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{
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using _traits = make_traits<no_value_t, ::sqlpp::tag::is_update_list>;
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using _recursive_traits = make_recursive_traits<Assignments...>;
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using _is_dynamic = is_database<Database>;
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// Data
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using _data_t = update_list_data_t<Database, Assignments...>;
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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 Assignment>
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void add_ntc(Assignment assignment)
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{
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add<Assignment, std::false_type>(assignment);
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}
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template<typename Assignment, typename TableCheckRequired = std::true_type>
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void add(Assignment assignment)
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{
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static_assert(_is_dynamic::value, "add must not be called for static from()");
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static_assert(is_assignment_t<Assignment>::value, "invalid assignment argument in add()");
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using _assigned_columns = detail::make_type_set_t<typename Assignments::_lhs_t...>;
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static_assert(not detail::is_element_of<typename Assignment::_lhs_t, _assigned_columns>::value, "Must not assign value to column twice");
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static_assert(sqlpp::detail::not_t<must_not_update_t, typename Assignment::_lhs_t>::value, "add() argument must not be updated");
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static_assert(TableCheckRequired::value or Policies::template _no_unknown_tables<Assignment>::value, "assignment uses tables unknown to this statement in add()");
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using ok = ::sqlpp::detail::all_t<
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_is_dynamic::value,
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is_assignment_t<Assignment>::value>;
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_add_impl(assignment, 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 Assignment>
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void _add_impl(Assignment assignment, const std::true_type&)
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{
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return _data._dynamic_assignments.emplace_back(assignment);
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}
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template<typename Assignment>
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void _add_impl(Assignment assignment, 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 = update_list_data_t<Database, Assignments...>;
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_impl_t<Policies> assignments;
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_impl_t<Policies>& operator()() { return assignments; }
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const _impl_t<Policies>& operator()() const { return assignments; }
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template<typename T>
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static auto _get_member(T t) -> decltype(t.assignments)
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{
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return t.assignments;
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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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static void _check_consistency() {}
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};
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};
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struct no_update_list_t
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{
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using _traits = make_traits<no_value_t, ::sqlpp::tag::is_where>;
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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_assignments;
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_impl_t<Policies>& operator()() { return no_assignments; }
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const _impl_t<Policies>& operator()() const { return no_assignments; }
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template<typename T>
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static auto _get_member(T t) -> decltype(t.no_assignments)
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{
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return t.no_assignments;
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}
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};
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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_update_list_t, T>;
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static void _check_consistency()
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{
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static_assert(wrong_t<_methods_t>::value, "update assignments required, i.e. set(...)");
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}
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template<typename... Assignments>
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auto set(Assignments... assignments)
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-> _new_statement_t<update_list_t<void, Assignments...>>
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{
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static_assert(sizeof...(Assignments), "at least one assignment expression required in set()");
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return _set_impl<void>(assignments...);
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}
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template<typename... Assignments>
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auto dynamic_set(Assignments... assignments)
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-> _new_statement_t<update_list_t<_database_t, Assignments...>>
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{
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static_assert(not std::is_same<_database_t, void>::value, "dynamic_set() must not be called in a static statement");
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return _set_impl<_database_t>(assignments...);
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}
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private:
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template<typename Database, typename... Assignments>
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auto _set_impl(Assignments... assignments)
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-> _new_statement_t<update_list_t<Database, Assignments...>>
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{
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static_assert(::sqlpp::detail::all_t<is_assignment_t<Assignments>::value...>::value, "at least one argument is not an assignment in set()");
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static_assert(not ::sqlpp::detail::has_duplicates<typename Assignments::_lhs_t...>::value, "at least one duplicate column detected in set()");
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static_assert(::sqlpp::detail::none_t<must_not_update_t<typename Assignments::_lhs_t>::value...>::value, "at least one assignment is prohibited by its column definition in set()");
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using _column_required_tables = ::sqlpp::detail::make_joined_set_t<required_tables_of<typename Assignments::_lhs_t>...>;
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static_assert(sizeof...(Assignments) ? (_column_required_tables::size::value == 1) : true, "set() contains assignments for columns from more than one table");
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return { *static_cast<typename Policies::_statement_t*>(this), update_list_data_t<Database, Assignments...>{assignments...} };
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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... Assignments>
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struct serializer_t<Context, update_list_data_t<Database, Assignments...>>
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{
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using T = update_list_data_t<Database, Assignments...>;
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static Context& _(const T& t, Context& context)
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{
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context << " SET ";
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interpret_tuple(t._assignments, ",", context);
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if (sizeof...(Assignments) and not t._dynamic_assignments.empty())
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context << ',';
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interpret_list(t._dynamic_assignments, ',', 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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