sqlpp11/tests/ResultTest.cpp

/*
 * 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 <iostream>
#include "Sample.h"
#include "MockDb.h"
#include <sqlpp11/sqlpp11.h>


static_assert(not sqlpp::enforce_null_result_treatment_t<MockDb>::value, "MockDb interprets NULL as trivial");
static_assert(sqlpp::enforce_null_result_treatment_t<EnforceDb>::value, "MockDb does not interpret NULL as trivial");

MockDb db = {};
EnforceDb edb {};

int main()
{
	test::TabBar t; 

	static_assert(sqlpp::can_be_null_t<decltype(t.alpha)>::value, "t.alpha can be null");
	static_assert(not sqlpp::null_is_trivial_value_t<decltype(t.alpha)>::value, "t.alpha does not say null_is_trivial");

	// Using a non-enforcing db
	for (const auto& row : db(select(all_of(t)).from(t).where(true)))
	{
		static_assert(sqlpp::can_be_null_t<decltype(row.alpha)>::value, "row.alpha can be null");
		static_assert(sqlpp::null_is_trivial_value_t<decltype(row.alpha)>::value, "row.alpha interprets null_is_trivial");
		static_assert(std::is_member_function_pointer<decltype(&decltype(row.alpha)::is_null)>::value, "Yikes");
		using T = sqlpp::wrap_operand_t<decltype(row.alpha)>;
		static_assert(sqlpp::can_be_null_t<T>::value, "row.alpha can be null");
		static_assert(sqlpp::is_result_field_t<T>::value, "row.alpha can be null");
		
		bool x = sqlpp::rhs_is_null(t.alpha == row.alpha);
		bool y = sqlpp::rhs_is_trivial(t.alpha == row.alpha);
		std::cerr << x << std::endl;
		std::cerr << y << std::endl;
		
		for (const auto& sub : db(select(all_of(t)).from(t).where(t.alpha == row.alpha)))
		{
			std::cerr << sub.alpha << std::endl;
		}
	}

	sqlpp::select((t.alpha + 1).as(t.alpha)).flags(sqlpp::all).from(t);
	for (const auto& row : db(select(all_of(t)).from(t).where(true)))
	{
		static_assert(sqlpp::can_be_null_t<decltype(row.alpha)>::value, "row.alpha can be null");
		static_assert(sqlpp::null_is_trivial_value_t<decltype(row.alpha)>::value, "row.alpha interprets null_is_trivial");
	}

	// Using a non-enforcing db
	for (const auto& row : edb(select(all_of(t)).from(t).where(true)))
	{
		static_assert(sqlpp::can_be_null_t<decltype(row.alpha)>::value, "row.alpha can be null");
		static_assert(not sqlpp::null_is_trivial_value_t<decltype(row.alpha)>::value, "row.alpha interprets null_is_trivial");
	}

	sqlpp::select((t.alpha + 1).as(t.alpha)).flags(sqlpp::all).from(t);
	for (const auto& row : edb(select(all_of(t)).from(t).where(true)))
	{
		static_assert(sqlpp::can_be_null_t<decltype(row.alpha)>::value, "row.alpha can be null");
		static_assert(not sqlpp::null_is_trivial_value_t<decltype(row.alpha)>::value, "row.alpha interprets null_is_trivial");
	}

	return 0;
}