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https://github.com/rbock/sqlpp11.git
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b41f1add8c
This allows to select NULL via a case statement (seems to make more sense than disallowing it).
62 lines
2.0 KiB
C++
62 lines
2.0 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_DEFAULT_VALUE_H
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#define SQLPP_DEFAULT_VALUE_H
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#include <sqlpp11/data_types/no_value.h>
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namespace sqlpp
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{
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struct default_value_t
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{
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using _traits = make_traits<no_value_t, tag::is_expression>;
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using _nodes = detail::type_vector<>;
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static constexpr bool _is_trivial()
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{
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return false;
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}
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};
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template <typename Context>
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struct serializer_t<Context, default_value_t>
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{
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using _serialize_check = consistent_t;
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using Operand = default_value_t;
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static Context& _(const Operand&, Context& context)
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{
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context << "DEFAULT";
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return context;
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}
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};
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constexpr default_value_t default_value = {};
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}
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#endif
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