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d0d5e94bf1
eval wraps whatever you give to it into a select call, sends it to the database and returns the value as a result field.
63 lines
2.1 KiB
C++
63 lines
2.1 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_RESULT_FIELD_H
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#define SQLPP_RESULT_FIELD_H
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#include <sqlpp11/wrong.h>
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#include <sqlpp11/result_field_methods.h>
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namespace sqlpp
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{
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template<typename ValueType, typename Db, typename FieldSpec>
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struct result_field_t
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{
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static_assert(wrong_t<result_field_t>::value, "Missing specialization for result_field_t");
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};
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template<typename Context, typename ValueType, typename Db, typename FieldSpec>
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struct serializer_t<Context, result_field_t<ValueType, Db, FieldSpec>>
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{
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using T = result_field_t<ValueType, Db, FieldSpec>;
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static Context& _(const T& t, Context& context)
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{
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if (t.is_null() and not null_is_trivial_value_t<T>::value)
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{
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context << "NULL";
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}
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else
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{
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context << t.value();
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}
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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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