~singpolyma/biboumi

2c717d347d796a2b007331c42d78146e156eaea0 — louiz’ 6 years ago 655151d
Add an index for the muc_log_line table

This immensely speeds up the archive select queries.

fix #3292
2 files changed, 45 insertions(+), 0 deletions(-)

M src/database/database.cpp
A src/database/index.hpp
M src/database/database.cpp => src/database/database.cpp +3 -0
@@ 6,6 6,8 @@
#include <utils/get_first_non_empty.hpp>
#include <utils/time.hpp>

#include <database/index.hpp>

#include <sqlite3.h>

sqlite3* Database::db;


@@ 42,6 44,7 @@ void Database::open(const std::string& filename)
  Database::irc_channel_options.upgrade(Database::db);
  Database::roster.create(Database::db);
  Database::roster.upgrade(Database::db);
  create_index<Database::Owner, Database::IrcChanName, Database::IrcServerName>(Database::db, "archive_index", Database::muc_log_lines.get_name());
}



A src/database/index.hpp => src/database/index.hpp +42 -0
@@ 0,0 1,42 @@
#pragma once

#include <sqlite3.h>

#include <string>
#include <tuple>

namespace
{
template <std::size_t N=0, typename... T>
typename std::enable_if<N == sizeof...(T), void>::type
add_column_name(std::string&)
{ }

template <std::size_t N=0, typename... T>
typename std::enable_if<N < sizeof...(T), void>::type
add_column_name(std::string& out)
{
  using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<std::tuple<T...>>()))>::type;
  out += ColumnType::name;
  if (N != sizeof...(T) - 1)
    out += ",";
  add_column_name<N+1, T...>(out);
}
}

template <typename... Columns>
void create_index(sqlite3* db, const std::string& name, const std::string& table)
{
  std::string res{"CREATE INDEX IF NOT EXISTS "};
  res += name + " ON " + table + "(";
  add_column_name<0, Columns...>(res);
  res += ")";

  char* error;
  const auto result = sqlite3_exec(db, res.data(), nullptr, nullptr, &error);
  if (result != SQLITE_OK)
    {
      log_error("Error executing query: ", error);
      sqlite3_free(error);
    }
}