mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-11-16 12:51:13 +08:00
5e96551f83
- `.from(t1, t2)` produces an unconditional join if you forget to add a condition in the .where() sqlpp11 therefore now deprecates unconditional joins. - more often than not, writing something like `where(name == "doe")`, you meant to write `where(t.name == "doe")`. It is hard to find bugs when the former expression compiles because you happen to have a variable `name` in the current scope as well. sqlpp11 therefore now deprecates `.where(bool)` and disallows raw bool values boolean expression like `something and bool` wrap bools in sqlpp::value(), if you REALLY want a bool value here
117 lines
4.0 KiB
C++
117 lines
4.0 KiB
C++
/*
|
|
* Copyright (c) 2013-2015, 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 <sqlpp11/type_traits.h>
|
|
#include <sqlpp11/interpret_tuple.h>
|
|
#include <sqlpp11/interpretable_list.h>
|
|
#include <sqlpp11/unconditional.h>
|
|
#include <sqlpp11/logic.h>
|
|
|
|
namespace sqlpp
|
|
{
|
|
template <typename Database, typename... Expressions>
|
|
struct on_t
|
|
{
|
|
using _traits = make_traits<no_value_t, tag::is_on>;
|
|
using _nodes = detail::type_vector<Expressions...>;
|
|
|
|
using _is_dynamic = is_database<Database>;
|
|
|
|
static_assert(_is_dynamic::value or sizeof...(Expressions), "at least one expression argument required in on()");
|
|
|
|
template <typename Expr>
|
|
void add(Expr expr)
|
|
{
|
|
static_assert(_is_dynamic::value, "on::add() must not be called for static on()");
|
|
static_assert(is_expression_t<Expr>::value, "invalid expression argument in on::add()");
|
|
using _serialize_check = sqlpp::serialize_check_t<typename Database::_serializer_context_t, Expr>;
|
|
_serialize_check::_();
|
|
|
|
using ok = logic::all_t<_is_dynamic::value, is_expression_t<Expr>::value, _serialize_check::type::value>;
|
|
|
|
_add_impl(expr, ok()); // dispatch to prevent compile messages after the static_assert
|
|
}
|
|
|
|
private:
|
|
template <typename Expr>
|
|
void _add_impl(Expr expr, const std::true_type&)
|
|
{
|
|
return _dynamic_expressions.emplace_back(expr);
|
|
}
|
|
|
|
template <typename Expr>
|
|
void _add_impl(Expr expr, const std::false_type&);
|
|
|
|
public:
|
|
std::tuple<Expressions...> _expressions;
|
|
interpretable_list_t<Database> _dynamic_expressions;
|
|
};
|
|
|
|
template <>
|
|
struct on_t<void, unconditional_t>
|
|
{
|
|
using _traits = make_traits<no_value_t, tag::is_on>;
|
|
using _nodes = detail::type_vector<>;
|
|
};
|
|
|
|
template <typename Context>
|
|
struct serializer_t<Context, on_t<void, unconditional_t>>
|
|
{
|
|
using _serialize_check = consistent_t;
|
|
using T = on_t<void, unconditional_t>;
|
|
|
|
static Context& _(const T&, Context& context)
|
|
{
|
|
return context;
|
|
}
|
|
};
|
|
|
|
template <typename Context, typename Database, typename... Expressions>
|
|
struct serializer_t<Context, on_t<Database, Expressions...>>
|
|
{
|
|
using _serialize_check = serialize_check_of<Context, Expressions...>;
|
|
using T = on_t<Database, Expressions...>;
|
|
|
|
static Context& _(const T& t, Context& context)
|
|
{
|
|
if (sizeof...(Expressions) == 0 and t._dynamic_expressions.empty())
|
|
return context;
|
|
context << " ON (";
|
|
interpret_tuple(t._expressions, " AND ", context);
|
|
if (sizeof...(Expressions) and not t._dynamic_expressions.empty())
|
|
context << " AND ";
|
|
interpret_list(t._dynamic_expressions, " AND ", context);
|
|
context << " )";
|
|
return context;
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif
|