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Enforce having expression to consist of aggregates

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This commit is contained in:
rbock 2016-03-17 19:18:14 +01:00
parent e70cc74198
commit 153427d2b8
5 changed files with 26 additions and 15 deletions
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14
include/sqlpp11/having.h
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@ -59,6 +59,8 @@ namespace sqlpp
assert_no_unknown_tables_in_having_t, assert_no_unknown_tables_in_having_t,
"at least one having-expression requires a table which is otherwise not known in the statement"); "at least one having-expression requires a table which is otherwise not known in the statement");
SQLPP_PORTABLE_STATIC_ASSERT(assert_no_non_aggregates_t, "having expression not built out of aggregate expressions");
// HAVING // HAVING
template <typename Database, typename Expression> template <typename Database, typename Expression>
struct having_t struct having_t
@ -139,9 +141,15 @@ namespace sqlpp
return t.having; return t.having;
} }
using _consistency_check = typename std::conditional<Policies::template _no_unknown_tables<having_t>::value, using _table_check = typename std::conditional<Policies::template _no_unknown_tables<having_t>::value,
consistent_t, consistent_t,
assert_no_unknown_tables_in_having_t>::type; assert_no_unknown_tables_in_having_t>::type;
using _aggregate_check = typename std::conditional<Policies::template _no_non_aggregates<Expression>::value,
consistent_t,
assert_no_non_aggregates_t>::type;
using _consistency_check = detail::get_first_if<is_inconsistent_t, consistent_t, _table_check, _aggregate_check>;
}; };
}; };

13
include/sqlpp11/select_column_list.h
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@ -91,7 +91,7 @@ namespace sqlpp
SQLPP_PORTABLE_STATIC_ASSERT( SQLPP_PORTABLE_STATIC_ASSERT(
assert_no_unknown_tables_in_selected_columns_t, assert_no_unknown_tables_in_selected_columns_t,
"at least one selected column requires a table which is otherwise not known in the statement"); "at least one selected column requires a table which is otherwise not known in the statement");
SQLPP_PORTABLE_STATIC_ASSERT(assert_aggregates_t, SQLPP_PORTABLE_STATIC_ASSERT(assert_no_unknown_aggregates_t,
"not all columns are made of aggregates, despite group_by or similar"); "not all columns are made of aggregates, despite group_by or similar");
// SELECTED COLUMNS // SELECTED COLUMNS
@ -195,16 +195,15 @@ namespace sqlpp
return t.selected_columns; return t.selected_columns;
} }
using _column_check = using _table_check = typename std::conditional<Policies::template _no_unknown_tables<select_column_list_t>::value,
typename std::conditional<Policies::template _no_unknown_tables<select_column_list_t>::value, consistent_t,
consistent_t, assert_no_unknown_tables_in_selected_columns_t>::type;
assert_no_unknown_tables_in_selected_columns_t>::type;
using _aggregate_check = typename std::conditional<Policies::template _no_unknown_aggregates<Columns...>::value, using _aggregate_check = typename std::conditional<Policies::template _no_unknown_aggregates<Columns...>::value,
consistent_t, consistent_t,
assert_aggregates_t>::type; assert_no_unknown_aggregates_t>::type;
using _consistency_check = detail::get_first_if<is_inconsistent_t, consistent_t, _column_check, _aggregate_check>; using _consistency_check = detail::get_first_if<is_inconsistent_t, consistent_t, _table_check, _aggregate_check>;
}; };
// Result methods // Result methods

4
include/sqlpp11/statement.h
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@ -93,6 +93,10 @@ namespace sqlpp
logic::all_t<detail::is_aggregate_expression_impl<_all_provided_aggregates, logic::all_t<detail::is_aggregate_expression_impl<_all_provided_aggregates,
Expressions>::type::value...>::value>; Expressions>::type::value...>::value>;
template <typename... Expressions>
using _no_non_aggregates = logic::any_t<logic::all_t<
detail::is_aggregate_expression_impl<_all_provided_aggregates, Expressions>::type::value...>::value>;
template <template <typename> class Predicate> template <template <typename> class Predicate>
using any_t = logic::any_t<Predicate<Policies>::value...>; using any_t = logic::any_t<Predicate<Policies>::value...>;

8
test_static_asserts/aggregates.cpp
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@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2015-2015, Roland Bock * Copyright (c) 2015-2016, Roland Bock
* All rights reserved. * All rights reserved.
* *
* Redistribution and use in source and binary forms, with or without modification, * Redistribution and use in source and binary forms, with or without modification,
@ -117,10 +117,10 @@ namespace
// Failures with static group_by and selected non-aggregates or incorrect aggregates // Failures with static group_by and selected non-aggregates or incorrect aggregates
void static_group_by_nok() void static_group_by_nok()
{ {
run_check<sqlpp::assert_aggregates_t>(select(t.beta).from(t).unconditionally().group_by(t.alpha)); run_check<sqlpp::assert_no_unknown_aggregates_t>(select(t.beta).from(t).unconditionally().group_by(t.alpha));
run_check<sqlpp::assert_aggregates_t>( run_check<sqlpp::assert_no_unknown_aggregates_t>(
select((t.alpha + t.delta).as(whatever)).from(t).unconditionally().group_by(t.alpha)); select((t.alpha + t.delta).as(whatever)).from(t).unconditionally().group_by(t.alpha));
run_check<sqlpp::assert_aggregates_t>( run_check<sqlpp::assert_no_unknown_aggregates_t>(
select((t.alpha + t.delta).as(whatever)).from(t).unconditionally().group_by(t.alpha, t.alpha + t.delta * 17)); select((t.alpha + t.delta).as(whatever)).from(t).unconditionally().group_by(t.alpha, t.alpha + t.delta * 17));
} }
} }

2
tests/Select.cpp
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@ -139,7 +139,7 @@ int Select(int, char* [])
.dynamic_where() .dynamic_where()
.dynamic_group_by(t.alpha) .dynamic_group_by(t.alpha)
.dynamic_order_by() .dynamic_order_by()
.dynamic_having(t.gamma) .dynamic_having(sum(t.alpha) > 17)
.dynamic_limit() .dynamic_limit()
.dynamic_offset(); .dynamic_offset();
s.select_flags.add(sqlpp::distinct); s.select_flags.add(sqlpp::distinct);