tqcq
99c258107b
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Co-authored-by: tqcq <99722391+tqcq@users.noreply.github.com> Reviewed-on: #2
75 lines
3.1 KiB
C++
75 lines
3.1 KiB
C++
/*
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* Copyright (c) 2013-2015, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "Sample.h"
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#include "MockDb.h"
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#include <sqlpp11/select.h>
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#include <sqlpp11/alias_provider.h>
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#include <iostream>
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namespace greek
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{
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SQLPP_ALIAS_PROVIDER(alpha)
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SQLPP_ALIAS_PROVIDER(beta)
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}
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int Union(int, char* [])
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{
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MockDb db;
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MockDb::_serializer_context_t printer = {};
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const auto t = test::TabBar{};
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const auto f = test::TabFoo{};
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db(select(t.alpha).from(t).unconditionally().union_distinct(select(f.epsilon.as(t.alpha)).from(f).unconditionally()));
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db(select(t.alpha).from(t).unconditionally().union_all(select(f.epsilon.as(t.alpha)).from(f).unconditionally()));
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// t.alpha can be null, a given value cannot
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db(select(t.alpha).from(t).unconditionally().union_all(select(sqlpp::value(1).as(t.alpha))));
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db(select(t.alpha).from(t).unconditionally().union_all(select(sqlpp::value(1).as(greek::alpha))));
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// t.beta can be null, f.delta cannot
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static_assert(sqlpp::can_be_null_t<decltype(t.beta)>::value, "");
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static_assert(!sqlpp::can_be_null_t<decltype(f.delta)>::value, "");
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db(select(t.beta).from(t).unconditionally().union_all(select(f.delta.as(greek::beta)).from(f).unconditionally()));
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auto u = select(t.alpha)
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.from(t)
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.unconditionally()
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.union_all(select(f.epsilon.as(t.alpha)).from(f).unconditionally())
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.as(sqlpp::alias::u);
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db(select(all_of(u)).from(u).unconditionally().union_all(select(t.delta.as(t.alpha)).from(t).unconditionally()));
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db(select(u.alpha).from(u).unconditionally().union_all(select(t.delta.as(t.alpha)).from(t).unconditionally()));
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db(select(t.alpha)
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.from(t)
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.unconditionally()
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.union_all(select(t.alpha).from(t).unconditionally())
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.union_all(select(t.alpha).from(t).unconditionally()));
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return 0;
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}
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