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Added recursive_traits to select

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rbock 2014-05-16 20:06:20 +02:00
parent 6972758931
commit f314c6d070
1 changed files with 21 additions and 11 deletions
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30
include/sqlpp11/select.h
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@ -117,7 +117,7 @@ namespace sqlpp
template<typename Expression>
using _no_unknown_tables = detail::is_subset_of<required_tables_of<Expression>, _known_tables>;
using _required_tables =
using _all_required_tables =
detail::make_joined_set_t<
required_tables_of<_flag_list_t>,
required_tables_of<_column_list_t>,
@ -130,8 +130,8 @@ namespace sqlpp
>;
// The tables not covered by the from.
using _table_set = detail::make_difference_set_t<
_required_tables,
using _required_tables = detail::make_difference_set_t<
_all_required_tables,
provided_tables_of<_from_t> // Hint: extra_tables_t is not used here because it is just a helper for dynamic .add_*() methods and should not change the structural integrity
>;
@ -139,7 +139,7 @@ namespace sqlpp
// - at least one column is selected
// - the select is complete (leaks no tables)
using _can_be_used_as_table = typename std::conditional<
is_select_column_list_t<_column_list_t>::value and _table_set::size::value == 0,
is_select_column_list_t<_column_list_t>::value and _required_tables::size::value == 0,
std::true_type,
std::false_type
>::type;
@ -151,6 +151,15 @@ namespace sqlpp
>::type;
using _traits = make_traits<_value_type>;
struct _recursive_traits
{
using _parameters = std::tuple<>; // FIXME
using _required_tables = _required_tables;
using _provided_tables = detail::type_set<>;
using _extra_tables = detail::type_set<>;
};
};
}
@ -162,10 +171,12 @@ namespace sqlpp
public detail::select_policies_t<Db, Policies...>::_value_type::template expression_operators<select_t<Db, Policies...>>,
public detail::select_policies_t<Db, Policies...>::_methods_t
{
using _traits = make_traits<value_type_of<detail::select_policies_t<Db, Policies...>>, ::sqlpp::tag::select>;
using _recursive_traits = make_recursive_traits<>; // FIXME
using _policies_t = typename detail::select_policies_t<Db, Policies...>;
using _traits = make_traits<value_type_of<_policies_t>, ::sqlpp::tag::select>;
using _recursive_traits = typename _policies_t::_recursive_traits;
using _database_t = typename _policies_t::_database_t;
using _flag_list_t = typename _policies_t::_flag_list_t;
using _column_list_t = typename _policies_t::_column_list_t;
@ -182,7 +193,6 @@ namespace sqlpp
using _parameter_tuple_t = std::tuple<Policies...>;
using _parameter_list_t = typename make_parameter_list_t<select_t>::type;
using _table_set = typename _policies_t::_table_set;
template<typename Database>
using _result_row_t = typename _column_list_t::template _result_row_t<Database>;
@ -256,7 +266,7 @@ namespace sqlpp
template<typename A>
struct is_table_subset_of_from
{
static constexpr bool value = ::sqlpp::detail::is_subset_of<typename A::_table_set, typename _from_t::_table_set>::value;
static constexpr bool value = ::sqlpp::detail::is_subset_of<required_tables_of<A>, provided_tables_of<_from_t>>::value;
};
void _check_consistency() const
@ -271,7 +281,7 @@ namespace sqlpp
static_assert(is_table_subset_of_from<_order_by_t>::value, "order_by() expression requires additional tables in from()");
static_assert(is_table_subset_of_from<_limit_t>::value, "limit() expression requires additional tables in from()");
static_assert(is_table_subset_of_from<_offset_t>::value, "offset() expression requires additional tables in from()");
static_assert(not _table_set::size::value, "one sub expression contains tables which are not in the from()");
static_assert(not required_tables_of<_policies_t>::size::value, "one sub expression contains tables which are not in the from()");
}
// Execute