mirror of
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116 lines
4.3 KiB
C++
116 lines
4.3 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 <iostream>
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#include "Sample.h"
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#include "MockDb.h"
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#include <sqlpp11/sqlpp11.h>
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#include <sqlpp11/custom_query.h>
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namespace
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{
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struct on_duplicate_key_update
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{
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std::string _serialized;
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template <typename Db, typename Assignment>
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on_duplicate_key_update(Db&, Assignment assignment)
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{
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typename Db::_serializer_context_t context;
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_serialized = " ON DUPLICATE KEY UPDATE " + serialize(assignment, context).str();
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}
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template <typename Db, typename Assignment>
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auto operator()(Db&, Assignment assignment) -> on_duplicate_key_update&
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{
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typename Db::_serializer_context_t context;
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_serialized += ", " + serialize(assignment, context).str();
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return *this;
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}
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auto get() const -> sqlpp::verbatim_t<::sqlpp::no_value_t>
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{
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return ::sqlpp::verbatim(_serialized);
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}
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};
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} // namespace
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int CustomQuery(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 f = test::TabFoo{};
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const auto t = test::TabBar{};
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// A void custom query
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printer.reset();
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auto x = custom_query(sqlpp::verbatim("PRAGMA writeable_schema = "), true);
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std::cerr << serialize(x, printer).str() << std::endl;
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db(x);
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// Syntactically, it is possible to use this void query as a prepared statement, too, not sure, whether this makes
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// sense very often...
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db(db.prepare(x));
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// A prepared custom select
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// The return type of the custom query is determined from the first argument which does have a return type, in this
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// case the select
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auto p = db.prepare(custom_query(select(all_of(t)).from(t), where(t.alpha > sqlpp::parameter(t.alpha))));
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p.params.alpha = 8;
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for (const auto& row : db(p))
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{
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std::cerr << row.alpha << std::endl;
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}
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// Create a custom "insert or ignore"
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db(custom_query(sqlpp::insert(), sqlpp::verbatim(" OR IGNORE"), into(t),
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insert_set(t.beta = "sample", t.gamma = true)));
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// Create a MYSQL style custom "insert on duplicate update"
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db(custom_query(sqlpp::insert_into(t).set(t.beta = "sample", t.gamma = true),
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on_duplicate_key_update(db, t.beta = "sample")(db, t.gamma = false).get()));
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// A custom (select ... into) with adjusted return type
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// The first argument with a return type is the select, but the custom query is really an insert. Thus, we tell it so.
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printer.reset();
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auto c = custom_query(select(all_of(t)).from(t), into(f)).with_result_type_of(insert_into(f));
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std::cerr << serialize(c, printer).str() << std::endl;
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auto i = db(c);
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static_assert(std::is_integral<decltype(i)>::value, "insert yields an integral value");
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auto d = custom_query(sqlpp::verbatim("INSERT INTO tab_sample VALUES()")).with_result_type_of(sqlpp::insert());
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auto j = db(d);
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static_assert(std::is_integral<decltype(j)>::value, "insert yields an integral value");
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for (const auto& row :
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db(custom_query(sqlpp::verbatim("PRAGMA user_version")).with_result_type_of(select(all_of(t)))))
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{
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(void)row.alpha;
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}
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return 0;
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}
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