#ifndef _MYDTL_DATABASE_H_
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#define _MYDTL_DATABASE_H_
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#if defined(_MSC_VER)
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#if _MSC_VER<1800
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#error MYDTL need C++11 compiler
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#endif //MSC
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#elif __cplusplus<201103L
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#error MYDTL need C++11 compiler
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#endif //C++11
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#include <stdint.h>
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#include <string.h>
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#include <type_traits>
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#include <tuple>
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#include <memory>
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#include <string>
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#include <vector>
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#include <functional>
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#include "apply_tuple.h"
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namespace qtl
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{
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struct null { };
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struct blob_data
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{
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void* data;
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size_t size;
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blob_data() : data(NULL), size(0) { }
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blob_data(void* d, size_t n) : data(d), size(n) { }
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};
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struct const_blob_data
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{
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const void* data;
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size_t size;
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const_blob_data() : data(NULL), size(0) { }
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const_blob_data(const void* d, size_t n) : data(d), size(n) { }
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};
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const size_t blob_buffer_size=64*1024;
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inline std::string& trim_string(std::string& str, const char* target)
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{
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str.erase(0, str.find_first_not_of(target));
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str.erase(str.find_last_not_of(target)+1);
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return str;
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}
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template<typename T>
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struct indicator
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{
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typedef T data_type;
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data_type data;
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size_t length;
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bool is_null;
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bool is_truncated;
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indicator()
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: is_null(false), is_truncated(false), length(0) { }
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explicit indicator(const data_type& src)
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: is_null(false), is_truncated(false), length(0), data(src) { }
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explicit indicator(data_type&& src)
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: is_null(false), is_truncated(false), length(0), data(std::move(src)) { }
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operator bool() const { return is_null; }
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operator data_type&() { return data; }
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operator const data_type&() const { return data; }
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};
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template<typename StringT>
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struct bind_string_helper
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{
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typedef StringT string_type;
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typedef typename string_type::value_type char_type;
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bind_string_helper(string_type&& value) : m_value(std::forward<string_type>(value)) { }
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void clear() { m_value.clear(); }
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char_type* alloc(size_t n) { m_value.resize(n); return (char_type*)m_value.data(); }
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void truncate(size_t n) { m_value.resize(n); }
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void assign(const char_type* str, size_t n) { m_value.assign(str, n); }
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const char_type* data() const { return m_value.data(); }
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size_t size() const { return m_value.size(); }
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private:
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string_type&& m_value;
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};
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template<typename StringT>
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inline bind_string_helper<typename std::decay<StringT>::type> bind_string(StringT&& value)
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{
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typedef typename std::decay<StringT>::type string_type;
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return bind_string_helper<string_type>(std::forward<string_type>(value));
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}
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template<typename Command>
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inline void bind_param(Command& command, size_t index, const std::string& param)
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{
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command.bind_param(index, param.data(), param.size());
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}
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template<typename Command>
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inline void bind_param(Command& command, size_t index, std::istream& param)
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{
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command.bind_param(index, param);
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}
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template<typename Command, typename T>
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inline void bind_param(Command& command, size_t index, const T& param)
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{
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command.bind_param(index, param);
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}
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// The order of the overloaded functions 'bind_field' is very important
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// The version with the most generic parameters is at the end
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template<typename Command, size_t N>
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inline void bind_field(Command& command, size_t index, char (&value)[N])
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{
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command.bind_field(index, value, N);
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}
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template<typename Command, size_t N>
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inline void bind_field(Command& command, size_t index, wchar_t (&value)[N])
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{
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command.bind_field(index, value, N);
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}
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template<typename Command>
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inline void bind_field(Command& command, size_t index, char* value, size_t length)
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{
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command.bind_field(index, value, length);
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}
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template<typename Command>
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inline void bind_field(Command& command, size_t index, wchar_t* value, size_t length)
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{
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command.bind_field(index, value, length);
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}
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template<typename Command>
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inline void bind_field(Command& command, size_t index, std::string&& value)
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{
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command.bind_field(index, bind_string(std::forward<std::string>(value)));
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}
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template<typename Command>
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inline void bind_field(Command& command, size_t index, std::wstring&& value)
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{
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command.bind_field(index, bind_string(std::forward<std::wstring>(value)));
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}
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template<typename Command>
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inline void bind_field(Command& command, size_t index, std::vector<char>&& value)
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{
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command.bind_field(index, bind_string(std::forward<std::vector<char>>(value)));
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}
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template<typename Command>
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inline void bind_field(Command& command, size_t index, std::vector<wchar_t>&& value)
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{
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command.bind_field(index, bind_string(std::forward<std::vector<wchar_t>>(value)));
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}
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template<typename Command, typename T, typename=typename std::enable_if<!std::is_reference<T>::value>::type>
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inline void bind_field(Command& command, size_t index, T&& value)
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{
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command.bind_field(index, std::forward<T>(value));
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}
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template<typename Command, typename T>
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inline void bind_field(Command& command, size_t index, T& value)
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{
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bind_field(command, index, std::forward<T>(value));
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}
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template<typename FieldType, typename Command, typename BindType>
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inline void bind_field(Command& command, size_t index, BindType& value)
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{
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FieldType temp=FieldType();
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bind_field(command, index, temp);
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value=static_cast<BindType>(temp);
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}
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template<typename FieldType, typename Command, typename BindType, typename CastFun>
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inline void bind_field(Command& command, size_t index, BindType& value, CastFun&& fun)
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{
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FieldType temp=FieldType();
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bind_field(command, index, temp);
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fun(value, temp);
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}
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namespace detail
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{
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template<typename F, typename T>
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struct apply_impl
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{
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private:
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typedef typename std::result_of<F(T)>::type raw_result_type;
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template<typename Ret, bool>
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struct impl {};
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template<typename Ret>
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struct impl<Ret, true>
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{
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typedef bool result_type;
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result_type operator()(F&& f, T&& v)
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{
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f(std::forward<T>(v));
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return true;
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}
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};
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template<typename Ret>
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struct impl<Ret, false>
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{
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typedef Ret result_type;
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result_type operator()(F&& f, T&& v)
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{
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return f(std::forward<T>(v));
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}
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};
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public:
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typedef typename impl<raw_result_type, std::is_void<raw_result_type>::value>::result_type result_type;
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result_type operator()(F&& f, T&& v)
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{
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return impl<raw_result_type, std::is_void<raw_result_type>::value>()(std::forward<F>(f), std::forward<T>(v));
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}
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};
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template<typename F, typename... Types>
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struct apply_impl<F, std::tuple<Types...>>
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{
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private:
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typedef typename std::remove_reference<F>::type fun_type;
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typedef std::tuple<Types...> arg_type;
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typedef typename std::result_of<F(Types...)>::type raw_result_type;
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template<typename Ret, bool>
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struct impl {};
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template<typename Ret>
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struct impl<Ret, true>
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{
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typedef bool result_type;
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result_type operator()(F&& f, arg_type&& v)
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{
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apply_tuple(std::forward<F>(f), std::forward<arg_type>(v));
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return true;
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}
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};
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template<typename Ret>
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struct impl<Ret, false>
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{
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typedef Ret result_type;
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result_type operator()(F&& f, arg_type&& v)
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{
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return apply_tuple(std::forward<F>(f), std::forward<arg_type>(v));
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}
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};
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public:
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typedef typename impl<raw_result_type, std::is_void<raw_result_type>::value>::result_type result_type;
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result_type operator()(F&& f, arg_type&& v)
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{
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return impl<raw_result_type, std::is_void<raw_result_type>::value>()(std::forward<F>(f), std::forward<arg_type>(v));
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}
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};
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template<typename Type, typename R>
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struct apply_impl<R (Type::*)(), Type>
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{
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private:
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typedef R (Type::*fun_type)();
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typedef R raw_result_type;
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template<typename Ret, bool>
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struct impl {};
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template<typename Ret>
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struct impl<Ret, true>
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{
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typedef bool result_type;
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result_type operator()(fun_type f, Type&& v)
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{
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(v.*f)();
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return true;
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}
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};
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template<typename Ret>
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struct impl<Ret, false>
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{
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typedef Ret result_type;
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result_type operator()(fun_type f, Type&& v)
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{
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return (v.*f)();
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}
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};
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public:
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typedef typename impl<raw_result_type, std::is_void<raw_result_type>::value>::result_type result_type;
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result_type operator()(R (Type::*f)(), Type&& v)
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{
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return impl<raw_result_type, std::is_void<raw_result_type>::value>()(f, std::forward<Type>(v));
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}
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};
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template<typename Type, typename R>
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struct apply_impl<R (Type::*)() const, Type>
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{
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private:
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typedef R (Type::*fun_type)() const;
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typedef R raw_result_type;
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template<typename Ret, bool>
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struct impl {};
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template<typename Ret>
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struct impl<Ret, true>
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{
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typedef bool result_type;
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result_type operator()(fun_type f, Type&& v)
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{
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(v.*f)();
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return true;
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}
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};
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template<typename Ret>
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struct impl<Ret, false>
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{
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typedef Ret result_type;
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result_type operator()(fun_type f, Type&& v)
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{
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return (v.*f)();
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}
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};
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public:
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typedef typename impl<raw_result_type, std::is_void<raw_result_type>::value>::result_type result_type;
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result_type operator()(fun_type f, Type&& v)
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{
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return impl<raw_result_type, std::is_void<raw_result_type>::value>()(f, std::forward<Type>(v));
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}
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};
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template<typename F, typename T>
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typename apply_impl<F, T>::result_type apply(F&& f, T&& v)
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{
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return apply_impl<F, T>()(std::forward<F>(f), std::forward<T>(v));
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}
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template<typename Command, size_t N, typename... Types>
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struct bind_helper
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{
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public:
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explicit bind_helper(Command& command) : m_command(command) { }
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void operator()(const std::tuple<Types...>& params) const
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{
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bind_param(m_command, N-1, std::get<N-1>(params));
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(bind_helper<Command, N-1, Types...>(m_command))(params);
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}
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void operator()(std::tuple<Types...>&& params) const
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{
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typedef typename std::remove_reference<typename std::tuple_element<N-1, tuple_type>::type>::type param_type;
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bind_field(m_command, N-1, std::forward<param_type>(std::get<N-1>(std::forward<tuple_type>(params))));
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(bind_helper<Command, N-1, Types...>(m_command))(std::forward<tuple_type>(params));
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}
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private:
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typedef std::tuple<Types...> tuple_type;
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Command& m_command;
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};
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template<typename Command, typename... Types>
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struct bind_helper<Command, 1, Types...>
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{
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public:
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explicit bind_helper(Command& command) : m_command(command) { }
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void operator()(const std::tuple<Types...>& params) const
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{
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bind_param(m_command, 0, std::get<0>(params));
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}
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void operator()(std::tuple<Types...>&& params) const
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{
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typedef typename std::remove_reference<typename std::tuple_element<0, tuple_type>::type>::type param_type;
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bind_field(m_command, 0, std::forward<param_type>(std::get<0>(std::forward<tuple_type>(params))));
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}
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private:
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typedef std::tuple<Types...> tuple_type;
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Command& m_command;
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};
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template<typename Command, typename... Types>
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struct bind_helper<Command, 0, Types...>
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{
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public:
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explicit bind_helper(Command& command) { }
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void operator()(const std::tuple<Types...>& params) const
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{
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}
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void operator()(std::tuple<Types...>&& params) const
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{
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}
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};
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#define QTL_ARGS_TUPLE(Arg, Others) \
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typename std::tuple<typename std::decay<Arg>::type, typename std::decay<Others>::type...>
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template<typename Ret, typename Arg>
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inline typename std::decay<Arg>::type make_values(Ret (*)(Arg))
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{
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return typename std::decay<Arg>::type();
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};
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template<typename Ret, typename Arg, typename... Others>
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inline auto make_values(Ret (*)(Arg, Others...)) -> QTL_ARGS_TUPLE(Arg, Others)
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{
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return QTL_ARGS_TUPLE(Arg, Others)();
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};
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template<typename Type, typename Ret>
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inline Type make_values(Ret (Type::*)())
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{
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return Type();
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};
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template<typename Type, typename Ret>
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inline Type make_values(Ret (Type::*)() const)
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{
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return Type();
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};
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template<typename Type, typename Ret, typename... Args>
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inline auto make_values(Ret (Type::*)(Args...)) -> QTL_ARGS_TUPLE(Type, Args)
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{
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return QTL_ARGS_TUPLE(Type, Args)();
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};
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template<typename Type, typename Ret, typename... Args>
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inline auto make_values(Ret (Type::*)(Args...) const) -> QTL_ARGS_TUPLE(Type, Args)
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{
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return QTL_ARGS_TUPLE(Type, Args)();
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};
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template<typename Type, typename Ret, typename Arg>
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inline typename std::decay<Arg>::type make_values_noclass(Ret (Type::*)(Arg))
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{
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return typename std::decay<Arg>::type();
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};
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template<typename Type, typename Ret, typename Arg>
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inline typename std::decay<Arg>::type make_values_noclass(Ret (Type::*)(Arg) const)
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{
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return typename std::decay<Arg>::type();
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};
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template<typename Type, typename Ret, typename Arg, typename... Others>
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inline auto make_values_noclass(Ret (Type::*)(Arg, Others...)) -> QTL_ARGS_TUPLE(Arg, Others)
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{
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return QTL_ARGS_TUPLE(Arg, Others)();
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};
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template<typename Type, typename Ret, typename Arg, typename... Others>
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inline auto make_values_noclass(Ret (Type::*)(Arg, Others...) const) -> QTL_ARGS_TUPLE(Arg, Others)
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{
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return QTL_ARGS_TUPLE(Arg, Others)();
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};
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template<typename Functor, typename=typename std::enable_if<std::is_member_function_pointer<decltype(&Functor::operator())>::value>::type>
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inline auto make_values(const Functor&)
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-> decltype(make_values_noclass(&Functor::operator()))
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{
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return make_values_noclass(&Functor::operator());
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}
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template<typename Command, typename ValueProc>
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inline void fetch_command(Command& command, ValueProc&& proc)
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{
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auto values=make_values(proc);
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typedef decltype(values) values_type;
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while(command.fetch(std::forward<values_type>(values)))
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{
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if(!detail::apply(std::forward<ValueProc>(proc), std::forward<values_type>(values)))
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break;
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}
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}
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template<typename Command, typename ValueProc, typename... OtherProc>
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inline void fetch_command(Command& command, ValueProc&& proc, OtherProc&&... other)
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{
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fetch_command(command, std::forward<ValueProc>(proc));
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if(command.next_result())
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{
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fetch_command(command, std::forward<OtherProc>(other)...);
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}
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}
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}
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template<typename Command, typename T>
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struct params_binder
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{
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inline void operator()(Command& command, const T& param) const
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{
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qtl::bind_param(command, 0, param);
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}
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};
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template<typename Command, typename... Types>
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struct params_binder<Command, std::tuple<Types...>>
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{
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void operator()(Command& command, const std::tuple<Types...>& params) const
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{
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(detail::bind_helper<Command, std::tuple_size<std::tuple<Types...>>::value, Types...>(command))(params);
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}
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};
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template<typename Command, typename Type1, typename Type2>
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struct params_binder<Command, std::pair<Type1, Type2>>
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{
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void operator()(Command& command, std::pair<Type1, Type2>&& values) const
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{
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qtl::bind_param(command, 0, std::forward<Type1>(values.first));
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qtl::bind_param(command, 1, std::forward<Type2>(values.second));
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}
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};
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template<typename Command, typename T>
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inline void bind_params(Command& command, const T& param)
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{
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params_binder<Command, T> binder;
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binder(command, param);
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}
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template<typename Command, typename T>
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struct record_binder
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{
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inline void operator()(Command& command, T&& value) const
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{
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bind_field(command, 0, std::forward<typename std::remove_reference<T>::type>(value));
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}
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};
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template<typename Command, typename... Types>
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struct record_binder<Command, std::tuple<Types...>>
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{
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void operator()(Command& command, std::tuple<Types...>&& values) const
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{
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(detail::bind_helper<Command, std::tuple_size<std::tuple<Types...>>::value, Types...>(command))
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(std::forward<std::tuple<Types...>>(values));
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}
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};
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template<typename Command, typename Type1, typename Type2>
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struct record_binder<Command, std::pair<Type1, Type2>>
|
{
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void operator()(Command& command, std::pair<Type1, Type2>&& values) const
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{
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bind_field(command, 0, std::forward<Type1>(values.first));
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bind_field(command, 1, std::forward<Type2>(values.second));
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}
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};
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template<typename Command, typename T>
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inline void bind_record(Command& command, T&& value)
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{
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record_binder<Command, T> binder;
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binder(command, std::forward<T>(value));
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}
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template<typename Command, typename Record>
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class query_iterator final : public std::iterator<std::forward_iterator_tag, Record>
|
{
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public:
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explicit query_iterator(Command& command)
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: m_command(command) { }
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Record* operator->() const { return m_record.get(); }
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Record& operator*() const { return *m_record; }
|
|
query_iterator& operator++()
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{
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if(!m_record)
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m_record=std::make_shared<Record>();
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if(m_record.unique())
|
{
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if(!m_command.fetch(std::forward<Record>(*m_record)))
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m_record.reset();
|
}
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else
|
{
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std::shared_ptr<Record> record=std::make_shared<Record>();
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if(m_command.fetch(std::forward<Record>(*record)))
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m_record=record;
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else
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m_record.reset();
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}
|
return *this;
|
}
|
query_iterator operator++(int)
|
{
|
query_iterator temp=*this;
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m_record=std::make_shared<Record>();
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if(!m_command.fetch(std::forward<Record>(*m_record)))
|
m_record.reset();
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return temp;
|
}
|
|
bool operator ==(const query_iterator& rhs)
|
{
|
return &this->m_command==&rhs.m_command &&
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this->m_record==rhs.m_record;
|
}
|
bool operator !=(const query_iterator& rhs)
|
{
|
return !(*this==rhs);
|
}
|
|
private:
|
Command& m_command;
|
std::shared_ptr<Record> m_record;
|
};
|
|
template<typename Command, typename Record>
|
class query_result final
|
{
|
public:
|
typedef typename query_iterator<Command, Record>::value_type value_type;
|
typedef typename query_iterator<Command, Record>::pointer pointer;
|
typedef typename query_iterator<Command, Record>::reference reference;
|
typedef query_iterator<Command, Record> iterator;
|
|
explicit query_result(Command&& command) : m_command(std::move(command)) { }
|
query_result(query_result&& src) : m_command(std::move(src.m_command)) { }
|
query_result& operator=(query_result&& src)
|
{
|
if(this!=&src)
|
m_command=std::move(src.m_command);
|
return *this;
|
}
|
|
template<typename Params>
|
iterator begin(const Params& params)
|
{
|
query_iterator<Command, Record> it(m_command);
|
++it;
|
return it;
|
}
|
iterator begin()
|
{
|
return begin(std::make_tuple());
|
}
|
|
iterator end()
|
{
|
return query_iterator<Command, Record>(m_command);
|
}
|
|
private:
|
Command m_command;
|
};
|
|
template<typename T, class Command>
|
class base_database
|
{
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public:
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template<typename Params>
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void execute(const char* query_text, size_t text_length, const Params& params, uint64_t* affected=NULL)
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{
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T* pThis=static_cast<T*>(this);
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Command command=pThis->open_command(query_text, text_length);
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command.execute(params);
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if(affected) *affected=command.affetced_rows();
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command.close();
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}
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template<typename Params>
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void execute(const char* query_text, const Params& params, uint64_t* affected=NULL)
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{
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return execute(query_text, strlen(query_text), params, affected);
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}
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template<typename Params>
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void execute(const std::string& query_text, const Params& params, uint64_t* affected=NULL)
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{
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return execute(query_text.data(), query_text.length(), params, affected);
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}
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template<typename... Params>
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void execute_direct(const char* query_text, size_t text_length, uint64_t* affected, const Params&... params)
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{
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execute(query_text, text_length, std::forward_as_tuple(params...), affected);
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}
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template<typename... Params>
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void execute_direct(const char* query_text, uint64_t* affected, const Params&... params)
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{
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execute(query_text, std::forward_as_tuple(params...), affected);
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}
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template<typename... Params>
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void execute_direct(const std::string& query_text, uint64_t* affected, const Params&... params)
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{
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execute(query_text, std::forward_as_tuple(params...), affected);
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}
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template<typename Params>
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uint64_t insert(const char* query_text, size_t text_length, const Params& params)
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{
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uint64_t id=0;
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T* pThis=static_cast<T*>(this);
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Command command=pThis->open_command(query_text, text_length);
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command.execute(params);
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if(command.affetced_rows()>0)
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id=command.insert_id();
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return id;
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}
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template<typename Params>
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uint64_t insert(const char* query_text, const Params& params)
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{
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return insert(query_text, strlen(query_text), params);
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}
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template<typename Params>
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uint64_t insert(const std::string& query_text, const Params& params)
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{
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return insert(query_text.data(), query_text.length(), params);
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}
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template<typename... Params>
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uint64_t insert_direct(const char* query_text, size_t text_length, const Params&... params)
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{
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return insert(query_text, text_length, std::forward_as_tuple(params...));
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}
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template<typename... Params>
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uint64_t insert_direct(const char* query_text, const Params&... params)
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{
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return insert(query_text, strlen(query_text), std::forward_as_tuple(params...));
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}
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template<typename... Params>
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uint64_t insert_direct(const std::string& query_text, const Params&... params)
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{
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return insert(query_text.data(), query_text.length(), std::forward_as_tuple(params...));
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}
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template<typename Record, typename Params>
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query_result<Command, Record> result(const char* query_text, size_t text_length, const Params& params)
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{
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T* pThis=static_cast<T*>(this);
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Command command=pThis->open_command(query_text, text_length);
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command.execute(params);
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return query_result<Command, Record>(std::move(command));
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}
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template<typename Record, typename Params>
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query_result<Command, Record> result(const char* query_text, const Params& params)
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{
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return result<Record, Params>(query_text, strlen(query_text), params);
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}
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template<typename Record, typename Params>
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query_result<Command, Record> result(const std::string& query_text, const Params& params)
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{
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return result<Record, Params>(query_text.data(), query_text.length(), params);
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}
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template<typename Record>
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query_result<Command, Record> result(const char* query_text, size_t text_length)
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{
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return result<Record>(query_text, text_length, std::make_tuple());
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}
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template<typename Record>
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query_result<Command, Record> result(const char* query_text)
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{
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return result<Record>(query_text, strlen(query_text), std::make_tuple());
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}
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template<typename Record>
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query_result<Command, Record> result(const std::string& query_text)
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{
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return result<Record>(query_text.data(), query_text.length(), std::make_tuple());
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}
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template<typename Params, typename Values, typename ValueProc>
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void query_explicit(const char* query_text, size_t text_length, const Params& params, Values&& values, ValueProc&& proc)
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{
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T* pThis=static_cast<T*>(this);
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Command command=pThis->open_command(query_text, text_length);
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command.execute(params);
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while(command.fetch(std::forward<Values>(values)))
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{
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if(!detail::apply(std::forward<ValueProc>(proc), std::forward<Values>(values))) break;
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}
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command.close();
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}
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template<typename Params, typename Values, typename ValueProc>
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void query_explicit(const char* query_text, const Params& params, Values&& values, ValueProc&& proc)
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{
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query_explicit(query_text, strlen(query_text), params, std::forward<Values>(values), std::forward<ValueProc>(proc));
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}
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template<typename Params, typename Values, typename ValueProc>
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void query_explicit(const std::string& query_text, const Params& params, Values&& values, ValueProc&& proc)
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{
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query_explicit(query_text.data(), query_text.size(), params, std::forward<Values>(values), std::forward<ValueProc>(proc));
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}
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template<typename Values, typename ValueProc>
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void query_explicit(const char* query_text, size_t text_length, Values&& values, ValueProc&& proc)
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{
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query_explicit(query_text, text_length, std::make_tuple(), std::forward<Values>(values), std::forward<ValueProc>(proc));
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}
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template<typename Values, typename ValueProc>
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void query_explicit(const char* query_text, Values&& values, ValueProc&& proc)
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{
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query_explicit(query_text, strlen(query_text), std::make_tuple(), std::forward<Values>(values), std::forward<ValueProc>(proc));
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}
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template<typename Values, typename ValueProc>
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void query_explicit(const std::string& query_text, Values&& values, ValueProc&& proc)
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{
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query_explicit(query_text, std::make_tuple(), std::forward<Values>(values), std::forward<ValueProc>(proc));
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}
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template<typename Params, typename ValueProc>
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void query(const char* query_text, size_t text_length, const Params& params, ValueProc&& proc)
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{
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query_explicit(query_text, text_length, params, detail::make_values(proc), std::forward<ValueProc>(proc));
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}
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template<typename Params, typename ValueProc>
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void query(const char* query_text, const Params& params, ValueProc&& proc)
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{
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query_explicit(query_text, params, detail::make_values(proc), std::forward<ValueProc>(proc));
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}
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template<typename Params, typename ValueProc>
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void query(const std::string& query_text, const Params& params, ValueProc&& proc)
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{
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query_explicit(query_text, params, detail::make_values(proc), std::forward<ValueProc>(proc));
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}
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template<typename ValueProc>
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void query(const char* query_text, size_t text_length, ValueProc&& proc)
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{
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query_explicit(query_text, text_length, detail::make_values(proc), std::forward<ValueProc>(proc));
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}
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template<typename ValueProc>
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void query(const char* query_text, ValueProc&& proc)
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{
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query_explicit(query_text, detail::make_values(proc), std::forward<ValueProc>(proc));
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}
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template<typename ValueProc>
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void query(const std::string& query_text, ValueProc&& proc)
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{
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query_explicit(query_text, detail::make_values(proc), std::forward<ValueProc>(proc));
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}
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template<typename Params, typename... ValueProc>
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void query_multi_with_params(const char* query_text, size_t text_length, const Params& params, ValueProc&&... proc)
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{
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T* pThis=static_cast<T*>(this);
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Command command=pThis->open_command(query_text, text_length);
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command.execute(params);
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detail::fetch_command(command, std::forward<ValueProc>(proc)...);
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command.close();
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}
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template<typename Params, typename... ValueProc>
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void query_multi_with_params(const char* query_text, const Params& params, ValueProc&&... proc)
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{
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query_multi_with_params(query_text, strlen(query_text), params, std::forward<ValueProc>(proc)...);
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}
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template<typename Params, typename... ValueProc>
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void query_multi_with_params(const std::string& query_text, const Params& params, ValueProc&&... proc)
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{
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query_multi_with_params(query_text.data(), query_text.size(), params, std::forward<ValueProc>(proc)...);
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}
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template<typename... ValueProc>
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void query_multi(const char* query_text, size_t text_length, ValueProc&&... proc)
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{
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query_multi_with_params<std::tuple<>>(query_text, text_length, std::make_tuple(), std::forward<ValueProc>(proc)...);
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}
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template<typename... ValueProc>
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void query_multi(const char* query_text, ValueProc&&... proc)
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{
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query_multi_with_params<std::tuple<>>(query_text, strlen(query_text), std::make_tuple(), std::forward<ValueProc>(proc)...);
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}
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template<typename... ValueProc>
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void query_multi(const std::string& query_text, ValueProc&&... proc)
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{
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query_multi_with_params<std::tuple<>>(query_text.data(), query_text.size(), std::make_tuple(), std::forward<ValueProc>(proc)...);
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}
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template<typename Params, typename Values>
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void query_first(const char* query_text, size_t text_length, const Params& params, Values&& values)
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{
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query_explicit(query_text, text_length, params, std::forward<Values>(values), first_record());
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}
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template<typename Params, typename Values>
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void query_first(const char* query_text, const Params& params, Values&& values)
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{
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query_explicit(query_text, strlen(query_text), params, std::forward<Values>(values), first_record());
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}
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template<typename Params, typename Values>
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void query_first(const std::string& query_text, const Params& params, Values&& values)
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{
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query_explicit(query_text, params, values, first_record());
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}
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template<typename Values>
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void query_first(const char* query_text, size_t text_length, Values&& values)
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{
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query_explicit(query_text, text_length, std::make_tuple(), std::forward<Values>(values), first_record());
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}
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template<typename Values>
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void query_first(const char* query_text, Values&& values)
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{
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query_explicit(query_text, strlen(query_text), std::make_tuple(), std::forward<Values>(values), first_record());
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}
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template<typename Values>
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void query_first(const std::string& query_text, Values&& values)
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{
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query_explicit(query_text, std::make_tuple(), std::forward<Values>(values), first_record());
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}
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template<typename... Values>
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void query_first_direct(const char* query_text, size_t text_length, Values&... values)
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{
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query_first(query_text, text_length, std::tie(values...));
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}
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template<typename... Values>
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void query_first_direct(const char* query_text, Values&... values)
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{
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query_first(query_text, std::tie(values...));
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}
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template<typename... Values>
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void query_first_direct(const std::string& query_text, Values&... values)
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{
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query_first(query_text, std::tie(values...));
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}
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protected:
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struct nothing
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{
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template<typename... Values> bool operator()(Values&&...) const { return true; }
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};
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struct first_record
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{
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template<typename... Values> bool operator()(Values&&...) const { return false; }
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};
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};
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template<typename Database>
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struct transaction
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{
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transaction(Database& db) : m_db(db), m_commited(true)
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{
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begin();
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}
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~transaction()
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{
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rollback();
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}
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void begin()
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{
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if(m_commited)
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{
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m_db.begin_transaction();
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m_commited=false;
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}
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}
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void rollback()
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{
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if(!m_commited)
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{
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m_db.rollback();
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m_commited=true;
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}
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}
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void commit()
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{
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if(!m_commited)
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{
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m_db.commit();
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m_commited=true;
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}
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}
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private:
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bool m_commited;
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Database& m_db;
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};
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template<typename Command, typename Params, typename... Others>
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inline void execute(Command& command, uint64_t* affected, const Params& params)
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{
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command.reset();
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command.execute(params);
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if(affected) *affected+=command.affetced_rows();
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}
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template<typename Command, typename Params, typename... Others>
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inline void execute(Command& command, uint64_t* affected, const Params& params, const Others&... others)
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{
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execute(command, affected, params);
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execute(command, affected, others...);
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}
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}
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#endif //_MYDTL_DATABASE_H_
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