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312e735d6d
This namespace is for things the developer will not get in touch with (normally) but the vendor might need to use for specialization of the interpreter. This separation is not fully completed yet, some changes will have to follow...
89 lines
3.3 KiB
C++
89 lines
3.3 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_WHERE_H
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#define SQLPP_WHERE_H
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#include <ostream>
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#include <sqlpp11/select_fwd.h>
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#include <sqlpp11/vendor/expression.h>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/detail/set.h>
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#include <sqlpp11/vendor/interpret_tuple.h>
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#include <sqlpp11/vendor/interpretable_list.h>
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#include <sqlpp11/parameter_list.h>
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namespace sqlpp
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{
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namespace vendor
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{
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template<typename Database, typename... Expr>
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struct where_t
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{
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using _is_where = std::true_type;
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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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using _parameter_tuple_t = std::tuple<Expr...>;
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static_assert(_is_dynamic::value or sizeof...(Expr), "at least one expression argument required in where()");
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using _valid_expressions = typename sqlpp::detail::make_set_if<is_expression_t, Expr...>::type;
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static_assert(_valid_expressions::size::value == sizeof...(Expr), "at least one argument is not an expression in where()");
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using _parameter_list_t = typename make_parameter_list_t<_parameter_tuple_t>::type;
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template<typename E>
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void add(E&& expr)
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{
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static_assert(is_expression_t<typename std::decay<E>::type>::value, "invalid expression argument in add_where()");
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_dynamic_expressions.emplace_back(std::forward<E>(expr));
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}
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_parameter_tuple_t _expressions;
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vendor::interpretable_list_t<Database> _dynamic_expressions;
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};
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template<typename Context, typename Database, typename... Expr>
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struct interpreter_t<Context, where_t<Database, Expr...>>
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{
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using T = where_t<Database, Expr...>;
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static Context& _(const T& t, Context& context)
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{
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if (sizeof...(Expr) == 0 and t._dynamic_expressions.empty())
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return context;
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context << " WHERE ";
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interpret_tuple(t._expressions, " AND ", context);
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if (sizeof...(Expr) and not t._dynamic_expressions.empty())
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context << " AND ";
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interpret_list(t._dynamic_expressions, " AND ", context);
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return context;
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}
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};
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}
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}
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#endif
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