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#pragma once
#include <database/statement.hpp>
#include <database/column.hpp>
#include <database/query.hpp>
#include <logger/logger.hpp>
#include <type_traits>
#include <vector>
#include <string>
#include <tuple>
template <std::size_t N=0, typename... T>
typename std::enable_if<N < sizeof...(T), void>::type
update_autoincrement_id(std::tuple<T...>& columns, Statement& statement)
{
using ColumnType = typename std::decay<decltype(std::get<N>(columns))>::type;
if (std::is_same<ColumnType, Id>::value)
auto&& column = std::get<Id>(columns);
update_autoincrement_id<N+1>(columns, statement);
}
template <std::size_t N=0, typename... T>
typename std::enable_if<N == sizeof...(T), void>::type
update_autoincrement_id(std::tuple<T...>&, Statement&)
{}
template <typename T>
std::string before_value()
{
return {};
}
template <typename T>
std::string after_value()
{
return {};
}
struct InsertQuery: public Query
{
template <typename... T>
InsertQuery(const std::string& name, const std::tuple<T...>& columns):
Query("INSERT INTO ")
{
this->body += name;
this->insert_col_names(columns);
this->insert_values(columns);
}
template <typename... T>
void execute(DatabaseEngine& db, std::tuple<T...>& columns)
{
#ifdef DEBUG_SQL_QUERIES
const auto timer = this->log_and_time();
#endif
auto statement = db.prepare(this->body);
this->bind_param(columns, *statement);
if (statement->step() != StepResult::Error)
db.extract_last_insert_rowid(*statement);
else
log_error("Failed to extract the rowid from the last INSERT");
}
template <int N=0, typename... T>
typename std::enable_if<N < sizeof...(T), void>::type
bind_param(const std::tuple<T...>& columns, Statement& statement, int index=1)
{
auto&& column = std::get<N>(columns);
using ColumnType = std::decay_t<decltype(column)>;
if (!std::is_same<ColumnType, Id>::value)
actual_bind(statement, column.value, index++);
this->bind_param<N+1>(columns, statement, index);
}
template <int N=0, typename... T>
typename std::enable_if<N == sizeof...(T), void>::type
bind_param(const std::tuple<T...>&, Statement&, int)
{}
template <typename... T>
void insert_values(const std::tuple<T...>& columns)
{
this->body += " VALUES (";
this->insert_value(columns);
this->body += ")";
}
template <int N=0, typename... T>
typename std::enable_if<N < sizeof...(T), void>::type
insert_value(const std::tuple<T...>& columns, int index=1)
{
using ColumnType = std::decay_t<decltype(std::get<N>(columns))>;
if (!std::is_same<ColumnType, Id>::value)
{
this->body += before_value<ColumnType>();
this->body += "$" + std::to_string(index++);
this->body += after_value<ColumnType>();
if (N != sizeof...(T) - 1)
this->body += ", ";
}
this->insert_value<N+1>(columns, index);
}
template <int N=0, typename... T>
typename std::enable_if<N == sizeof...(T), void>::type
insert_value(const std::tuple<T...>&, const int)
{ }
template <typename... T>
void insert_col_names(const std::tuple<T...>& columns)
{
this->body += " (";
this->insert_col_name(columns);
this->body += ")";
}
template <int N=0, typename... T>
typename std::enable_if<N < sizeof...(T), void>::type
insert_col_name(const std::tuple<T...>& columns)
{
using ColumnType = std::decay_t<decltype(std::get<N>(columns))>;
if (!std::is_same<ColumnType, Id>::value)
{
this->body += ColumnType::name;
if (N < (sizeof...(T) - 1))
this->body += ", ";
}
this->insert_col_name<N+1>(columns);
}
template <int N=0, typename... T>
typename std::enable_if<N == sizeof...(T), void>::type
insert_col_name(const std::tuple<T...>&)
{}
};
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