mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-11-16 12:51:13 +08:00
59 lines
3.8 KiB
C++
59 lines
3.8 KiB
C++
/*
|
|
* Copyright (c) 2023, 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 "compare.h"
|
|
#include "Sample.h"
|
|
#include <sqlpp11/sqlpp11.h>
|
|
|
|
#include <iostream>
|
|
|
|
SQLPP_ALIAS_PROVIDER(id_count)
|
|
SQLPP_ALIAS_PROVIDER(cheese)
|
|
|
|
using namespace sqlpp;
|
|
|
|
int SelectAs(int, char*[])
|
|
{
|
|
const auto foo = test::TabFoo{};
|
|
const auto bar = test::TabBar{};
|
|
|
|
// SELECT...AS as selectable column
|
|
//using S = table_alias_t<cheese_t, select_pseudo_table_t<statement_t<no_with_t, select_t, no_select_flag_list_t, select_column_list_t<as_expression<count_t<noop, column_t<test::TabBar, test::TabBar_::Id> >, id_count_t> >, from_t<test::TabBar>, where_t<unconditional_t>, no_group_by_t, no_having_t, no_order_by_t, no_limit_t, no_offset_t, no_union_t, no_for_update_t>, as_expression<count_t<noop, column_t<test::TabBar, test::TabBar_::Id> >, id_count_t> >, select_column_spec_t<statement_t<no_with_t, select_t, no_select_flag_list_t, select_column_list_t<as_expression<count_t<noop, column_t<test::TabBar, test::TabBar_::Id> >, id_count_t> >, from_t<test::TabBar>, where_t<unconditional_t>, no_group_by_t, no_having_t, no_order_by_t, no_limit_t, no_offset_t, no_union_t, no_for_update_t>, as_expression<count_t<noop, column_t<test::TabBar, test::TabBar_::Id> >, id_count_t> > >;
|
|
using S = select_pseudo_table_t<statement_t<no_with_t, select_t, no_select_flag_list_t, select_column_list_t<as_expression<count_t<noop, column_t<test::TabBar, test::TabBar_::Id> >, id_count_t> >, from_t<test::TabBar>, where_t<unconditional_t>, no_group_by_t, no_having_t, no_order_by_t, no_limit_t, no_offset_t, no_union_t, no_for_update_t>> ;
|
|
static_assert(sqlpp::has_value_type<S>::value, "");
|
|
/*
|
|
sqlpp::name_tag_of_t<decltype(select(count(bar.id).as(id_count)).from(bar).unconditionally())::_result_type_provider>::hansi;
|
|
sqlpp::value_type_of_t<decltype(select(count(bar.id).as(id_count)).from(bar).unconditionally())::_result_type_provider>::hansi;
|
|
static_assert(sqlpp::has_value_type<decltype(select(count(bar.id).as(id_count)).from(bar).unconditionally())>::value, "");
|
|
static_assert(sqlpp::has_name<decltype(select(count(bar.id).as(id_count)).from(bar).unconditionally())>::value, "");
|
|
*/
|
|
#error: The select itself should not offer an "as" that yields a value.
|
|
#error: The id_count should offer the alias that offers the value.
|
|
compare(__LINE__, select(foo.doubleN, select(count(bar.id).as(id_count)).from(bar).unconditionally().as(cheese)),
|
|
"SELECT tab_foo.double_n,(SELECT COUNT(tab_bar.id) AS id_count FROM tab_bar) AS cheese");
|
|
|
|
return 0;
|
|
}
|