insert_query.hpp 3.44 KB
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#pragma once

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#include <database/statement.hpp>
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#include <database/column.hpp>
#include <database/query.hpp>
#include <logger/logger.hpp>

#include <type_traits>
#include <vector>
#include <string>
#include <tuple>

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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)
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{
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  using ColumnType = typename std::decay<decltype(std::get<N>(columns))>::type;
  if (std::is_same<ColumnType, Id>::value)
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    auto&& column = std::get<Id>(columns);
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  update_autoincrement_id<N+1>(columns, statement);
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}

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template <std::size_t N=0, typename... T>
typename std::enable_if<N == sizeof...(T), void>::type
update_autoincrement_id(std::tuple<T...>&, Statement& statement)
{}

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struct InsertQuery: public Query
{
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  template <typename... T>
  InsertQuery(const std::string& name, const std::tuple<T...>& columns):
      Query("INSERT INTO ")
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  {
    this->body += name;
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    this->insert_col_names(columns);
    this->insert_values(columns);
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  }

  template <typename... T>
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  void execute(DatabaseEngine& db, std::tuple<T...>& columns)
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  {
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    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");
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  }

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  template <int N=0, typename... T>
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  typename std::enable_if<N < sizeof...(T), void>::type
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  bind_param(const std::tuple<T...>& columns, Statement& statement, int index=1)
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  {
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    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++);
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    this->bind_param<N+1>(columns, statement, index);
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  }

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  template <int N=0, typename... T>
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  typename std::enable_if<N == sizeof...(T), void>::type
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  bind_param(const std::tuple<T...>&, Statement&, int)
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  {}

  template <typename... T>
  void insert_values(const std::tuple<T...>& columns)
  {
    this->body += "VALUES (";
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    this->insert_value(columns);
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    this->body += ")";
  }

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  template <int N=0, typename... T>
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  typename std::enable_if<N < sizeof...(T), void>::type
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  insert_value(const std::tuple<T...>& columns, int index=1)
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  {
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    using ColumnType = std::decay_t<decltype(std::get<N>(columns))>;

    if (!std::is_same<ColumnType, Id>::value)
      {
        this->body += "$" + std::to_string(index++);
        if (N != sizeof...(T) - 1)
          this->body += ", ";
      }
    this->insert_value<N+1>(columns, index);
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  }
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  template <int N=0, typename... T>
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  typename std::enable_if<N == sizeof...(T), void>::type
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  insert_value(const std::tuple<T...>&, const int)
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  { }

  template <typename... T>
  void insert_col_names(const std::tuple<T...>& columns)
  {
    this->body += " (";
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    this->insert_col_name(columns);
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    this->body += ")";
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  }

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  template <int N=0, typename... T>
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  typename std::enable_if<N < sizeof...(T), void>::type
  insert_col_name(const std::tuple<T...>& columns)
  {
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    using ColumnType = std::decay_t<decltype(std::get<N>(columns))>;
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    if (!std::is_same<ColumnType, Id>::value)
      {
        this->body += ColumnType::name;
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        if (N < (sizeof...(T) - 1))
          this->body += ", ";
      }
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    this->insert_col_name<N+1>(columns);
  }
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  template <int N=0, typename... T>
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  typename std::enable_if<N == sizeof...(T), void>::type
  insert_col_name(const std::tuple<T...>&)
  {}
};