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bda77c620b
sqlpp::optional is an alias for std::optional for C++17 and beyond. Otherwise, it is a simple and incomplete backport. For older versions of C++, the library offers simple back Similar for string_view and span.
75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
/*
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* Copyright (c) 2013 - 2016, 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 "TabSample.h"
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#include <sqlpp11/sqlite3/connection.h>
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#include <sqlpp11/sqlpp11.h>
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#ifdef SQLPP_USE_SQLCIPHER
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#include <sqlcipher/sqlite3.h>
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#else
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#include <sqlite3.h>
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#endif
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#include <iostream>
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namespace sql = sqlpp::sqlite3;
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const auto tab = TabSample{};
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template <typename T>
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std::ostream& operator<<(std::ostream& os, const sqlpp::optional<T>& t) {
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if (not t)
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return os << "NULL";
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return os << t.value();
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}
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int Union(int, char*[])
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{
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sql::connection_config config;
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config.path_to_database = ":memory:";
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config.flags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE;
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config.debug = true;
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sql::connection db(config);
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db.execute(R"(CREATE TABLE tab_sample (
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alpha INTEGER PRIMARY KEY,
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beta varchar(255) DEFAULT NULL,
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gamma bool
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))");
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auto u = select(all_of(tab)).from(tab).unconditionally().union_all(select(all_of(tab)).from(tab).unconditionally());
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for (const auto& row : db(u))
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{
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std::cout << row.alpha << row.beta << row.gamma << std::endl;
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}
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for (const auto& row : db(u.union_distinct(select(all_of(tab)).from(tab).unconditionally())))
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{
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std::cout << row.alpha << row.beta << row.gamma << std::endl;
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}
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return 0;
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}
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