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92 lines
3.6 KiB
C++
92 lines
3.6 KiB
C++
/*
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* Copyright (c) 2013-2016, 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 SQLPP11_SELECT_PSEUDO_TABLE_H
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#define SQLPP11_SELECT_PSEUDO_TABLE_H
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#include <sqlpp11/data_types/no_value.h>
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#include <sqlpp11/table.h>
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namespace sqlpp
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{
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// FIXME: We might use field specs here (same as with cte)
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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 =
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detail::make_intersect_set_t<required_tables_of<NamedExpr>, typename Select::_used_outer_tables>::size::value >
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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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template <typename Select, typename... NamedExpr>
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struct select_pseudo_table_t
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: public table_t<select_pseudo_table_t<Select, NamedExpr...>, select_column_spec_t<Select, NamedExpr>...>
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{
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using _traits = make_traits<no_value_t,
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tag::is_table,
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tag::is_pseudo_table,
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tag_if<tag::requires_braces, requires_braces_t<Select>::value>>;
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using _nodes = detail::type_vector<>;
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select_pseudo_table_t(Select select) : _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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} // namespace sqlpp
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#endif
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