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Added check to prevent multicolumns in sub selects

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This commit is contained in:
rbock 2014-06-28 21:02:49 +02:00
parent f113b83740
commit 39413ee1bb
3 changed files with 3 additions and 5 deletions
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2
include/sqlpp11/multi_column.h
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@ -76,7 +76,7 @@ namespace sqlpp
template<typename AliasProvider, typename... Columns>
struct multi_column_alias_t
{
using _traits = make_traits<no_value_t, tag::alias, tag::named_expression>;
using _traits = make_traits<no_value_t, tag::alias, tag::multi_column, tag::named_expression>;
using _recursive_traits = make_recursive_traits<Columns...>;
static_assert(detail::all_t<is_named_expression_t<Columns>::value...>::value, "multi_column parameters need to be named expressions");

1
include/sqlpp11/select_column_list.h
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@ -269,6 +269,7 @@ namespace sqlpp
_alias_t<AliasProvider> as(const AliasProvider& aliasProvider) const
{
static_assert(Policies::_can_be_used_as_table::value, "statement cannot be used as table, e.g. due to missing tables");
static_assert(::sqlpp::detail::none_t<is_multi_column_t<Columns>::value...>::value, "cannot use multi-columns in sub selects");
return _table_t<AliasProvider>(_get_statement()).as(aliasProvider);
}

5
tests/SelectTypeTest.cpp
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@ -290,11 +290,8 @@ int main()
{
auto m = multi_column(t.alpha, t.beta).as(alias::a);
static_assert(not sqlpp::is_expression_t<decltype(m)>::value, "a multi_column is not a value");
#warning: A multicolumn cannot be used if the select is to be used like a table
auto a = select(m).from(t).as(alias::b).a;
//static_assert(not sqlpp::is_expression_t<decltype(a)>::value, "a multi_column is not a value");
}
// Test that result sets with identical name/value combinations have identical types
{
auto a = select(t.alpha);