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84 lines
3.0 KiB
C++
84 lines
3.0 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_TABLE_ALIAS_H
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#define SQLPP_TABLE_ALIAS_H
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#include <sqlpp11/column_fwd.h>
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#include <sqlpp11/interpret.h>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/alias.h>
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#include <sqlpp11/detail/type_set.h>
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namespace sqlpp
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{
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template<typename AliasProvider, typename Table, typename... ColumnSpec>
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struct table_alias_t: public ColumnSpec::_name_t::template _member_t<column_t<AliasProvider, ColumnSpec>>...
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{
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//FIXME: Need to add join functionality
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using _traits = make_traits<value_type_of<Table>, tag::is_table, tag::is_alias, tag_if<tag::is_named_expression, is_expression_t<Table>::value>>;
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struct _recursive_traits
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{
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using _parameters = std::tuple<>;
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using _required_tables = detail::type_set<>;
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using _provided_tables = detail::type_set<AliasProvider>;
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using _provided_outer_tables = detail::type_set<>;
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using _extra_tables = detail::type_set<>;
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using _can_be_null = std::false_type;
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};
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static_assert(required_tables_of<Table>::size::value == 0, "table aliases must not depend on external tables");
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using _name_t = typename AliasProvider::_name_t;
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using _column_tuple_t = std::tuple<column_t<AliasProvider, ColumnSpec>...>;
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table_alias_t(Table table):
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_table(table)
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{}
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Table _table;
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};
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template<typename Context, typename AliasProvider, typename Table, typename... ColumnSpec>
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struct serializer_t<Context, table_alias_t<AliasProvider, Table, ColumnSpec...>>
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{
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using T = table_alias_t<AliasProvider, Table, ColumnSpec...>;
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static Context& _(const T& t, Context& context)
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{
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context << "(";
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serialize(t._table, context);
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context << ") AS " << T::_name_t::_get_name();
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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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