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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.
138 lines
4.2 KiB
C++
138 lines
4.2 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_FUNCTIONS_H
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#define SQLPP_FUNCTIONS_H
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#include <sqlpp11/parameter.h>
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#include <sqlpp11/parameter_list.h>
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#include <sqlpp11/column_types.h>
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#include <sqlpp11/in.h>
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#include <sqlpp11/is_null.h>
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#include <sqlpp11/value_type.h>
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#include <sqlpp11/exists.h>
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#include <sqlpp11/any.h>
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#include <sqlpp11/some.h>
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#include <sqlpp11/count.h>
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#include <sqlpp11/min.h>
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#include <sqlpp11/max.h>
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#include <sqlpp11/avg.h>
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#include <sqlpp11/sum.h>
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#include <sqlpp11/verbatim.h> // Csaba Csoma suggests: unsafe_sql instead of verbatim
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#include <sqlpp11/verbatim_table.h>
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#include <sqlpp11/value_or_null.h>
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#include <sqlpp11/eval.h>
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namespace sqlpp
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{
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template<typename T>
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auto value(T t) -> wrap_operand_t<T>
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{
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static_assert(is_wrapped_value_t<wrap_operand_t<T>>::value, "value() is to be called with non-sql-type like int, or string");
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return { t };
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}
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template<typename Expression, typename Db>
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auto flatten(const Expression& exp, Db& db) -> verbatim_t<value_type_of<Expression>>
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{
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static_assert(not make_parameter_list_t<Expression>::size::value, "parameters are not allowed in flattened expressions");
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auto context = db.get_serializer_context();
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serialize(exp, context);
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return { context.str() };
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}
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template<typename Expression>
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auto is_null(Expression e) -> decltype(e.is_null())
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{
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return e.is_null();
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}
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template<typename Expression>
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auto is_not_null(Expression e) -> decltype(e.is_not_null())
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{
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return e.is_not_null();
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}
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template<typename Container>
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struct value_list_t // to be used in .in() method
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{
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using _traits = make_traits<value_type_t<typename Container::value_type>, ::sqlpp::tag::is_expression>;
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using _recursive_traits = make_recursive_traits<>;
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using _container_t = Container;
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value_list_t(_container_t container):
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_container(container)
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{}
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value_list_t(const value_list_t&) = default;
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value_list_t(value_list_t&&) = default;
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value_list_t& operator=(const value_list_t&) = default;
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value_list_t& operator=(value_list_t&&) = default;
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~value_list_t() = default;
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_container_t _container;
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};
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template<typename Context, typename Container>
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struct serializer_t<Context, value_list_t<Container>>
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{
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using T = value_list_t<Container>;
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static Context& _(const T& t, Context& context)
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{
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bool first = true;
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for (const auto& entry: t._container)
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{
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if (first)
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first = false;
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else
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context << ',';
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serialize(value(entry), context);
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}
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return context;
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}
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};
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template<typename Container>
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auto value_list(Container c) -> value_list_t<Container>
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{
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static_assert(is_wrapped_value_t<wrap_operand_t<typename Container::value_type>>::value, "value_list() is to be called with a container of non-sql-type like std::vector<int>, or std::list(string)");
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return { c };
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}
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template<typename T>
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constexpr const char* get_sql_name(const T&)
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{
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return T::_name_t::_get_name();
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}
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}
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#endif
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