mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-12-27 08:31:06 +08:00
78 lines
3.0 KiB
C++
78 lines
3.0 KiB
C++
/*
|
|
* Copyright (c) 2013-2015, 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/select.h>
|
|
#include <sqlpp11/alias_provider.h>
|
|
#include <iostream>
|
|
|
|
int With(int, char*[])
|
|
{
|
|
MockDb db;
|
|
MockDb::_serializer_context_t printer = {};
|
|
|
|
const auto t = test::TabBar{};
|
|
|
|
auto x = sqlpp::cte(sqlpp::alias::x).as(select(all_of(t)).from(t));
|
|
|
|
db(with(x)(select(x.alpha).from(x).unconditionally()));
|
|
|
|
auto y0 = sqlpp::cte(sqlpp::alias::y).as(select(all_of(t)).from(t));
|
|
auto y = y0.union_all(select(all_of(y0)).from(y0).unconditionally());
|
|
|
|
std::cout << serialize(y, printer).str() << std::endl;
|
|
printer.reset();
|
|
std::cout << serialize(from_table(y), printer).str() << std::endl;
|
|
|
|
db(with(y)(select(y.alpha).from(y).unconditionally()));
|
|
|
|
using ::sqlpp::alias::a;
|
|
using ::sqlpp::alias::b;
|
|
const auto c =
|
|
sqlpp::cte(b).as(select(t.alpha.as(a)).from(t).unconditionally().union_all(select(sqlpp::value(123).as(a))));
|
|
db(with(c)(select(all_of(c)).from(c).unconditionally()));
|
|
|
|
// recursive CTE with join
|
|
{
|
|
const auto selectBase = select(t.alpha, t.delta).from(t).where(t.alpha > 17);
|
|
const auto initialCte = ::sqlpp::cte(sqlpp::alias::a).as(selectBase);
|
|
const auto recursiveCte = initialCte.union_all(
|
|
select(t.alpha, t.delta).from(t.join(initialCte).on(t.alpha == initialCte.delta)).unconditionally());
|
|
const auto query = with(recursiveCte)(select(recursiveCte.alpha).from(recursiveCte).unconditionally());
|
|
|
|
printer.reset();
|
|
const auto serializedQuery = serialize(query, printer).str();
|
|
std::cout << serializedQuery << '\n';
|
|
|
|
for (const auto& row : db(query))
|
|
{
|
|
std::cout << row.alpha;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|