mirror of
https://github.com/rbock/sqlpp11.git
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211 lines
7.2 KiB
C++
211 lines
7.2 KiB
C++
/*
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* Copyright (c) 2013, 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_REMOVE_H
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#define SQLPP_REMOVE_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/parameter_list.h>
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#include <sqlpp11/prepared_remove.h>
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#include <sqlpp11/vendor/noop.h>
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#include <sqlpp11/vendor/single_table.h>
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#include <sqlpp11/vendor/using.h>
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#include <sqlpp11/vendor/where.h>
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#include <sqlpp11/vendor/policy_update.h>
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#include <sqlpp11/detail/arg_selector.h>
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namespace sqlpp
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{
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namespace detail
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{
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template<typename Table, typename Using, typename Where>
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struct check_remove_t
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{
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static_assert(is_where_t<Where>::value, "cannot run remove without having a where condition, use .where(true) to remove all rows");
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static constexpr bool value = true;
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};
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}
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// REMOVE
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template<typename Database,
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typename Table = vendor::no_single_table_t,
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typename Using = vendor::no_using_t,
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typename Where = vendor::no_where_t
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>
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struct remove_t
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{
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using _database_t = Database;
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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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template<typename Needle, typename Replacement, typename... Policies>
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struct _policies_update_impl
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{
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using type = remove_t<Database, vendor::policy_update_t<Policies, Needle, Replacement>...>;
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};
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template<typename Needle, typename Replacement>
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using _policies_update_t = typename _policies_update_impl<Needle, Replacement, Table, Using, Where>::type;
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using _parameter_tuple_t = std::tuple<Table, Using, Where>;
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using _parameter_list_t = typename make_parameter_list_t<remove_t>::type;
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// Constructors
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remove_t()
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{}
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template<typename Statement, typename T>
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remove_t(Statement s, T t):
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_table(detail::arg_selector<Table>::_(s._table, t)),
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_using(detail::arg_selector<Using>::_(s._using, t)),
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_where(detail::arg_selector<Where>::_(s._where, t))
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{}
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remove_t(const remove_t&) = default;
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remove_t(remove_t&&) = default;
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remove_t& operator=(const remove_t&) = default;
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remove_t& operator=(remove_t&&) = default;
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~remove_t() = default;
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// type update functions
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template<typename... Args>
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auto using_(Args... args)
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-> _policies_update_t<vendor::no_using_t, vendor::using_t<void, Args...>>
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{
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static_assert(is_noop_t<Using>::value, "cannot call using_()/dynamic_using() twice");
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return { *this, vendor::using_t<void, Args...>{args...} };
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}
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template<typename... Args>
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auto dynamic_using(Args... args)
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-> _policies_update_t<vendor::no_using_t, vendor::using_t<_database_t, Args...>>
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{
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static_assert(is_noop_t<Using>::value, "cannot call using_()/dynamic_using() twice");
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static_assert(not std::is_same<_database_t, void>::value, "dynamic_using must not be called in a static statement");
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return { *this, vendor::using_t<_database_t, Args...>{args...} };
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}
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template<typename... Args>
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auto where(Args... args)
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-> _policies_update_t<vendor::no_where_t, vendor::where_t<void, Args...>>
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{
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static_assert(is_noop_t<Where>::value, "cannot call where()/dynamic_where() twice");
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return { *this, vendor::where_t<void, Args...>{args...} };
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}
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template<typename... Args>
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auto dynamic_where(Args... args)
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-> _policies_update_t<vendor::no_where_t, vendor::where_t<_database_t, Args...>>
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{
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static_assert(is_noop_t<Where>::value, "cannot call where()/dynamic_where() twice");
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static_assert(not std::is_same<_database_t, void>::value, "dynamic_where must not be called in a static statement");
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return { *this, vendor::where_t<_database_t, Args...>{args...} };
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}
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// value adding methods
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template<typename... Args>
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void add_using(Args... args)
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{
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static_assert(is_using_t<Using>::value, "cannot call add_using() before dynamic_using()");
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static_assert(is_dynamic_t<Using>::value, "cannot call add_using() before dynamic_using()");
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return _using.add_using(args...);
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}
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template<typename... Args>
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void add_where(Args... args)
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{
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static_assert(is_where_t<Where>::value, "cannot call add_where() before dynamic_where()");
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static_assert(is_dynamic_t<Where>::value, "cannot call add_where() before dynamic_where()");
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return _where.add_where(*this, args...);
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}
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// run and prepare
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static constexpr size_t _get_static_no_of_parameters()
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{
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return _parameter_list_t::size::value;
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}
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size_t _get_no_of_parameters() const
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{
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return _parameter_list_t::size::value;
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}
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template<typename Db>
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std::size_t _run(Db& db) const
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{
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static_assert(_get_static_no_of_parameters() == 0, "cannot run remove directly with parameters, use prepare instead");
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//static_assert(detail::check_remove_t<Policies...>::value, "Cannot run this remove expression");
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return db.remove(*this);
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}
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template<typename Db>
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auto _prepare(Db& db) const
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-> prepared_remove_t<Db, remove_t>
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{
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//static_assert(detail::check_remove_t<Policies...>::value, "Cannot run this remove expression");
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return {{}, db.prepare_remove(*this)};
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}
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Table _table;
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Using _using;
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Where _where;
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};
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namespace vendor
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{
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template<typename Context, typename Database, typename... Policies>
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struct serializer_t<Context, remove_t<Database, Policies...>>
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{
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using T = remove_t<Database, Policies...>;
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static Context& _(const T& t, Context& context)
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{
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context << "DELETE FROM ";
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serialize(t._table, context);
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serialize(t._using, context);
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serialize(t._where, context);
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return context;
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}
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};
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}
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template<typename Table>
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constexpr auto remove_from(Table table)
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-> remove_t<void, vendor::single_table_t<void, Table>>
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{
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return { remove_t<void>(), vendor::single_table_t<void, Table>{table} };
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}
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template<typename Database, typename Table>
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constexpr auto dynamic_remove_from(const Database&, Table table)
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-> remove_t<Database, vendor::single_table_t<void, Table>>
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{
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return { remove_t<Database>(), vendor::single_table_t<void, Table>{table} };
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}
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}
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#endif
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