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Ensure that expression do not contain aggregate functions

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This commit is contained in:
rbock 2014-09-17 23:03:51 +02:00
parent 3cab459077
commit 6dbdd39ce1
6 changed files with 59 additions and 13 deletions
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3
include/sqlpp11/count.h
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@ -51,7 +51,6 @@ namespace sqlpp
static_assert(is_noop<Flag>::value or std::is_same<distinct_t, Flag>::value, "count() used with flag other than 'distinct'");
static_assert(is_expression_t<Expr>::value, "count() requires a sql expression as argument");
struct _name_t
{
@ -100,7 +99,6 @@ namespace sqlpp
template<typename T>
auto count(T t) -> count_t<noop, wrap_operand_t<T>>
{
static_assert(not contains_aggregate_function_t<wrap_operand_t<T>>::value, "count() cannot be used on an aggregate function");
static_assert(is_expression_t<wrap_operand_t<T>>::value, "count() requires an expression as argument");
return { t };
}
@ -108,7 +106,6 @@ namespace sqlpp
template<typename T>
auto count(const distinct_t&, T t) -> count_t<distinct_t, wrap_operand_t<T>>
{
static_assert(not contains_aggregate_function_t<wrap_operand_t<T>>::value, "count() cannot be used on an aggregate function");
static_assert(is_expression_t<wrap_operand_t<T>>::value, "count() requires an expression as argument");
return { t };
}

5
include/sqlpp11/max.h
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@ -39,8 +39,6 @@ namespace sqlpp
using _traits = make_traits<value_type_of<Expr>, tag::is_expression, tag::is_named_expression>;
using _recursive_traits = make_recursive_traits<Expr, aggregate_function>;
static_assert(is_expression_t<Expr>::value, "max() requires a value expression as argument");
struct _name_t
{
static constexpr const char* _get_name() { return "MAX"; }
@ -83,8 +81,7 @@ namespace sqlpp
template<typename T>
auto max(T t) -> max_t<wrap_operand_t<T>>
{
static_assert(not contains_aggregate_function_t<wrap_operand_t<T>>::value, "max() cannot be used on an aggregate function");
static_assert(is_expression_t<wrap_operand_t<T>>::value, "max() requires a value expression as argument");
static_assert(is_expression_t<wrap_operand_t<T>>::value, "max() requires an expression as argument");
return { t };
}

5
include/sqlpp11/min.h
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@ -39,8 +39,6 @@ namespace sqlpp
using _traits = make_traits<value_type_of<Expr>, tag::is_expression, tag::is_named_expression>;
using _recursive_traits = make_recursive_traits<Expr, aggregate_function>;
static_assert(is_expression_t<Expr>::value, "min() requires a value expression as argument");
struct _name_t
{
static constexpr const char* _get_name() { return "MIN"; }
@ -83,8 +81,7 @@ namespace sqlpp
template<typename T>
auto min(T t) -> min_t<wrap_operand_t<T>>
{
static_assert(not contains_aggregate_function_t<wrap_operand_t<T>>::value, "min() cannot be used on an aggregate function");
static_assert(is_expression_t<wrap_operand_t<T>>::value, "min() requires a value expression as argument");
static_assert(is_expression_t<wrap_operand_t<T>>::value, "min() requires an expression as argument");
return { t };
}

18
include/sqlpp11/type_traits.h
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@ -68,6 +68,23 @@ namespace sqlpp
template<typename T>
using column_spec_can_be_null_t = typename detail::column_spec_can_be_null_impl<T>::type;
namespace tag
{
struct is_expression{};
};
namespace detail
{
template<typename T, typename Enable = void>
struct is_expression_impl { using type = std::false_type; };
template<typename T>
struct is_expression_impl<T, typename std::enable_if<
detail::is_element_of<tag::is_expression, typename T::_traits::_tags>::value
and not detail::is_element_of<tag::contains_aggregate_function, typename T::_recursive_traits::_tags>::value
>::type> { using type = std::true_type; };
}
template<typename T>
using is_expression_t = typename detail::is_expression_impl<T>::type;
#define SQLPP_VALUE_TRAIT_GENERATOR(name) \
namespace tag\
{\
@ -94,7 +111,6 @@ namespace sqlpp
detail::is_element_of<tag::is_floating_point, typename T::_traits::_tags>::value>;
SQLPP_VALUE_TRAIT_GENERATOR(is_text);
SQLPP_VALUE_TRAIT_GENERATOR(is_wrapped_value);
SQLPP_VALUE_TRAIT_GENERATOR(is_expression);
SQLPP_VALUE_TRAIT_GENERATOR(is_named_expression);
SQLPP_VALUE_TRAIT_GENERATOR(is_multi_expression);
SQLPP_VALUE_TRAIT_GENERATOR(is_alias);

3
test_constraints/CMakeLists.txt
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@ -24,7 +24,8 @@ function(test_constraint name pattern)
endfunction(test_constraint)
test_constraint(count_of_count "cannot be used on an aggregate function")
test_constraint(count_of_count "requires an expression as argument")
test_constraint(max_of_max "requires an expression as argument")
test_constraint(no_conversion_operator_if_null_not_trivial "int i = row.alpha")
test_constraint(require_insert "required column is missing")
test_constraint(must_not_insert "one assignment is prohibited")

38
test_constraints/max_of_max.cpp Normal file
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@ -0,0 +1,38 @@
/*
* Copyright (c) 2013-2014, Roland Bock
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Sample.h"
#include "MockDb.h"
#include <sqlpp11/functions.h>
#include <iostream>
MockDb db;
int main()
{
test::TabBar t;
max(max(t.alpha));
}