sqlpp11/tests/core/serialize/clause/cte.cpp

/*
 * Copyright (c) 2024, 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
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 */

#include "Sample.h"
#include "../compare.h"
#include <sqlpp11/sqlpp11.h>

int main(int, char* [])
{
  const auto foo = test::TabFoo{};
  const auto bar = test::TabBar{};

  // No expression (not super useful).
  SQLPP_COMPARE(cte(sqlpp::alias::x), "x");

  // Simple CTE: X AS SELECT
  {
    const auto x = cte(sqlpp::alias::x).as(select(foo.id).from(foo).unconditionally());
    const auto a = x.as(sqlpp::alias::a);
    SQLPP_COMPARE(x, "x AS (SELECT tab_foo.id FROM tab_foo)");
    SQLPP_COMPARE(make_table_ref(x), "x");
    SQLPP_COMPARE(x.id, "x.id");
    SQLPP_COMPARE(a, "x AS a");
    SQLPP_COMPARE(a.id, "a.id");
    SQLPP_COMPARE(all_of(x), "x.id");
    SQLPP_COMPARE(all_of(a), "a.id");
  }

  // Non-recursive union CTE: X AS SELECT ... UNION ALL SELECT ...
  {
    const auto x =
        cte(sqlpp::alias::x)
            .as(select(foo.id).from(foo).unconditionally().union_all(select(bar.id).from(bar).unconditionally()));
    const auto a = x.as(sqlpp::alias::a);
    SQLPP_COMPARE(x, "x AS (SELECT tab_foo.id FROM tab_foo UNION ALL SELECT tab_bar.id FROM tab_bar)");
    SQLPP_COMPARE(make_table_ref(x), "x");
    SQLPP_COMPARE(x.id, "x.id");
    SQLPP_COMPARE(a, "x AS a");
    SQLPP_COMPARE(a.id, "a.id");
    SQLPP_COMPARE(all_of(x), "x.id");
    SQLPP_COMPARE(all_of(a), "a.id");
  }

  // Recursive union CTE: X AS SELECT ... UNION ALL SELECT ... FROM X ...
  {
    const auto x_base = cte(sqlpp::alias::x).as(select(sqlpp::value(0).as(sqlpp::alias::a)));
    const auto x = x_base.union_all(select((x_base.a + 1).as(sqlpp::alias::a)).from(x_base).where(x_base.a < 10));
    const auto y = x.as(sqlpp::alias::y);
    SQLPP_COMPARE(x, "x AS (SELECT 0 AS a UNION ALL SELECT (x.a + 1) AS a FROM x WHERE x.a < 10)");
    SQLPP_COMPARE(make_table_ref(x), "x");
    SQLPP_COMPARE(x.a, "x.a");
    SQLPP_COMPARE(y, "x AS y");
    SQLPP_COMPARE(y.a, "y.a");
    SQLPP_COMPARE(all_of(x), "x.a");
    SQLPP_COMPARE(all_of(y), "y.a");
  }

  return 0;
}