sqlpp11/tests/core/usage/With.cpp

/*
 * 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/core/clause/select.h>
#include <sqlpp11/core/name/alias_provider.h>
#include <iostream>
#include "../../include/test_helpers.h"

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.id).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.id).from(y).unconditionally()));

  using ::sqlpp::alias::a;
  using ::sqlpp::alias::b;
  const auto c =
      sqlpp::cte(b).as(select(t.id.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.id, t.intN).from(t).where(t.id > 17);
    const auto initialCte = ::sqlpp::cte(sqlpp::alias::a).as(selectBase);
    const auto recursiveCte = initialCte.union_all(
        select(t.id, t.intN).from(t.join(initialCte).on(t.id == initialCte.intN)).unconditionally());
    const auto query/query = with(recursiveCte)(select(recursiveCte.id).from(recursiveCte).unconditionally());

    printer.reset();
    const auto serializedQuery = serialize(query/query, printer).str();
    std::cout << serializedQuery << '\n';

    for (const auto& row : db(query/query))
    {
      std::cout << row.id;
    }
  }

  return 0;
}