mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-11-15 20:31:16 +08:00
90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
/*
|
|
* Copyright (c) 2013, 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.
|
|
*/
|
|
|
|
#ifndef SQLPP_ON_H
|
|
#define SQLPP_ON_H
|
|
|
|
#include <ostream>
|
|
#include <vector>
|
|
#include <sqlpp11/type_traits.h>
|
|
#include <sqlpp11/detail/serializable.h>
|
|
|
|
namespace sqlpp
|
|
{
|
|
template<typename Expr>
|
|
struct on_t
|
|
{
|
|
static_assert(is_expression_t<Expr>::value, "invalid expression argument in on()");
|
|
|
|
using _is_on = std::true_type;
|
|
|
|
template<typename Db>
|
|
void serialize(std::ostream& os, Db& db) const
|
|
{
|
|
os << " ON ";
|
|
_expr.serialize(os, db);
|
|
}
|
|
|
|
Expr _expr;
|
|
};
|
|
|
|
template<typename Db>
|
|
struct dynamic_on_t
|
|
{
|
|
|
|
using _is_on = std::true_type;
|
|
using _is_dynamic = std::true_type;
|
|
|
|
template<typename Expr>
|
|
void add(Expr&& expr)
|
|
{
|
|
static_assert(is_expression_t<typename std::decay<Expr>::type>::value, "invalid expression argument in on()");
|
|
_conditions.push_back(std::forward<Expr>(expr));
|
|
}
|
|
|
|
void serialize(std::ostream& os, Db& db) const
|
|
{
|
|
if (_conditions.empty())
|
|
return;
|
|
|
|
os << " ON ";
|
|
bool first = true;
|
|
for (const auto& condition : _conditions)
|
|
{
|
|
if (not first)
|
|
os << " AND ";
|
|
condition.serialize(os, db);
|
|
first = false;
|
|
}
|
|
}
|
|
|
|
std::vector<detail::serializable_t<Db>> _conditions;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|