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Improved decision whether a select is a value or not

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This commit is contained in:
rbock 2014-04-12 08:22:46 +02:00
parent cffc85879a
commit bbae5e89e9
1 changed files with 5 additions and 3 deletions
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8
include/sqlpp11/select.h
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@ -109,9 +109,9 @@ namespace sqlpp
static_assert(is_noop_t<ColumnList>::value or sqlpp::is_select_column_list_t<ColumnList>::value, "column list of select is neither naught nor a valid column list");
static_assert(is_noop_t<From>::value or sqlpp::is_from_t<From>::value, "from() part of select is neither naught nor a valid from()");
using _value_type = typename std::conditional<
sqlpp::is_from_t<From>::value,
_column_list_t::_table_set::size::value ? sqlpp::is_from_t<From>::value : true,
typename ColumnList::_value_type,
no_value_t // If there is no from, the select is not complete (this logic is a bit simple, but better than nothing)
no_value_t // If something is selected that requires a table, then we require a from for this to be a value
>::type;
};
}
@ -142,7 +142,7 @@ namespace sqlpp
using _parameter_list_t = typename make_parameter_list_t<select_t>::type;
using _table_set = detail::make_difference_set_t<
typename _from_t::_table_set,
detail::make_joined_set_t<
detail::make_joined_set_t< // Hint: extra_tables are not used here because they are just helpers for dynamic .add_*() methods
typename _flag_list_t::_table_set,
typename _column_list_t::_table_set,
typename _where_t::_table_set,
@ -235,6 +235,7 @@ namespace sqlpp
#warning: need to check in add_xy method as well
#warning: need add_wxy_without_table_check
#warning: might want to add an .extra_tables() method to say which tables might also be used here, say via dynamic_from or because this is a subselect
static_assert(is_table_subset_of_from<_flag_list_t>::value, "flags require additional tables in from()");
static_assert(is_table_subset_of_from<_column_list_t>::value, "selected columns require additional tables in from()");
static_assert(is_table_subset_of_from<_where_t>::value, "where() expression requires additional tables in from()");
static_assert(is_table_subset_of_from<_group_by_t>::value, "group_by() expression requires additional tables in from()");
@ -242,6 +243,7 @@ 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(_get_static_no_of_parameters() == 0, "cannot run select directly with parameters, use prepare instead");
return {db.select(*this), get_dynamic_names()};