mirror of
https://github.com/rbock/sqlpp11.git
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82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
/*
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* Copyright (c) 2013, 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 Expr>
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struct select_column_spec_t
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{
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using _name_t = typename Expr::_name_t;
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using _value_type = typename Expr::_value_type;
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struct _column_type {};
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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 sqlpp::table_base_t<select_pseudo_table_t<
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Select,
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NamedExpr...>, select_column_spec_t<NamedExpr>...>
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{
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using _value_type = no_value_t;
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select_pseudo_table_t(const Select& select):
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_select(select)
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{
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}
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select_pseudo_table_t(Select&& select):
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_select(std::move(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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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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{
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static_assert(Db::_supports_select_as_table, "select as table not supported by current database");
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_select.serialize(os, db);
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}
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Select _select;
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};
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}
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#endif
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