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74cafe35dd
Before this, there could be multiple classes representing multiple id columns. Now there is one class representing ALL the name "id". Very important for analyzing potential name clashes.
91 lines
3.3 KiB
C++
91 lines
3.3 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_SELECT_PSEUDO_TABLE_H
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#define SQLPP_SELECT_PSEUDO_TABLE_H
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#include <sqlpp11/no_value.h>
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namespace sqlpp
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{
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// provide type information for sub-selects that are used as named expressions or tables
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template<typename Select, typename NamedExpr>
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struct select_column_spec_t
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{
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using _alias_t = typename NamedExpr::_alias_t;
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static constexpr bool _can_be_null = can_be_null_t<NamedExpr>::value;
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static constexpr bool _depends_on_outer_table = detail::make_intersect_set_t<required_tables_of<NamedExpr>, typename Select::_used_outer_tables>::size::value > 0;
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using _traits = make_traits<value_type_of<NamedExpr>,
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tag::must_not_insert,
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tag::must_not_update,
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tag_if<tag::can_be_null, _can_be_null or _depends_on_outer_table>
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>;
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};
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template<
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typename Select,
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typename... NamedExpr
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>
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struct select_pseudo_table_t: public table_t<select_pseudo_table_t<
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Select,
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NamedExpr...>, select_column_spec_t<Select, NamedExpr>...>
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{
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using _traits = make_traits<no_value_t, tag::is_table, tag::is_pseudo_table>;
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using _recursive_traits = make_recursive_traits<>;
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select_pseudo_table_t(Select select):
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_select(select)
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{
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}
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select_pseudo_table_t(const select_pseudo_table_t& rhs) = default;
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select_pseudo_table_t(select_pseudo_table_t&& rhs) = default;
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select_pseudo_table_t& operator=(const select_pseudo_table_t& rhs) = default;
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select_pseudo_table_t& operator=(select_pseudo_table_t&& rhs) = default;
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~select_pseudo_table_t() = default;
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Select _select;
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};
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template<typename Context, typename Select, typename... NamedExpr>
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struct serializer_t<Context, select_pseudo_table_t<Select, NamedExpr...>>
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{
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using _serialize_check = serialize_check_of<Context, Select, NamedExpr...>;
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using T = select_pseudo_table_t<Select, NamedExpr...>;
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static Context& _(const T& t, Context& context)
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{
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serialize(t._select, context);
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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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