Add postgresql support

CMakeLists.txt

@@ -130,6 +130,12 @@ elseif(NOT WITHOUT_SQLITE3)
   find_package(SQLITE3)
 endif()
 
+if(WITH_POSTGRESQL)
+  find_package(PQ REQUIRED)
+elseif(NOT WITHOUT_POSTGRESQL)
+  find_package(PQ)
+endif()
+
 #
 ## Set all the include directories, depending on what libraries are used
 #
@@ -193,6 +199,7 @@ if(SQLITE3_FOUND)
   add_library(database OBJECT ${source_database})
 
   include_directories(database ${SQLITE3_INCLUDE_DIRS})
+  include_directories(database ${PQ_INCLUDE_DIRS})
   set(USE_DATABASE TRUE)
 else()
   add_library(database OBJECT "")
@@ -261,7 +268,9 @@ if(LIBIDN_FOUND)
 endif()
 if(USE_DATABASE)
   target_link_libraries(${PROJECT_NAME} ${SQLITE3_LIBRARIES})
+  target_link_libraries(${PROJECT_NAME} ${PQ_LIBRARIES})
   target_link_libraries(test_suite ${SQLITE3_LIBRARIES})
+  target_link_libraries(test_suite ${PQ_LIBRARIES})
 endif()
 
 # Define a __FILENAME__ macro with the relative path (from the base project directory)

INSTALL.rst

@@ -32,10 +32,12 @@ libiconv_
 libuuid_
  Generate unique IDs
 
-sqlite3_ (option, but highly recommended)
+sqlite3_
- Provides a way to store various options in a (sqlite3) database. Each user
+or
- of the gateway can store their own values (for example their prefered port,
+libpq_
- or their IRC password). Without this dependency, many interesting features
+ Provides a way to store various options in a database. Each user of the
+ gateway can store their own values (for example their prefered port, or
+ their IRC password). Without this dependency, many interesting features
  are missing.
 
 libidn_ (optional, but recommended)
@@ -165,3 +167,4 @@ to use biboumi.
 .. _systemd: https://www.freedesktop.org/wiki/Software/systemd/
 .. _biboumi.1.rst: doc/biboumi.1.rst
 .. _gcrypt: https://www.gnu.org/software/libgcrypt/
+.. _libpq: https://www.postgresql.org/docs/current/static/libpq.html

cmake/Modules/FindPQ.cmake

@@ -0,0 +1,43 @@
+# - Find libpq
+# Find the postgresql front end library
+#
+# This module defines the following variables:
+#   PQ_FOUND  -  True if library and include directory are found
+# If set to TRUE, the following are also defined:
+#   PQ_INCLUDE_DIRS  -  The directory where to find the header file
+#   PQ_LIBRARIES  -  Where to find the library file
+#
+# For conveniance, these variables are also set. They have the same values
+# than the variables above.  The user can thus choose his/her prefered way
+# to write them.
+#   PQ_LIBRARY
+#   PQ_INCLUDE_DIR
+#
+# This file is in the public domain
+
+include(FindPkgConfig)
+
+if(NOT PQ_FOUND)
+  pkg_check_modules(PQ libpq)
+endif()
+
+if(NOT PQ_FOUND)
+  find_path(PQ_INCLUDE_DIRS NAMES libpq-fe.h
+      DOC "The libpq include directory")
+
+  find_library(PQ_LIBRARIES NAMES pq
+      DOC "The pq library")
+
+  # Use some standard module to handle the QUIETLY and REQUIRED arguments, and
+  # set PQ_FOUND to TRUE if these two variables are set.
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args(PQ REQUIRED_VARS PQ_LIBRARIES PQ_INCLUDE_DIRS)
+
+  if(PQ_FOUND)
+    set(PQ_LIBRARY ${PQ_LIBRARIES} CACHE INTERNAL "")
+    set(PQ_INCLUDE_DIR ${PQ_INCLUDE_DIRS} CACHE INTERNAL "")
+    set(PQ_FOUND ${PQ_FOUND} CACHE INTERNAL "")
+  endif()
+endif()
+
+mark_as_advanced(PQ_INCLUDE_DIRS PQ_LIBRARIES)

src/database/column.hpp

@@ -13,5 +13,10 @@ struct Column
     T value{};
 };
 
-struct Id: Column<std::size_t> { static constexpr auto name = "id_";
+struct Id: Column<std::size_t> {
-                                 static constexpr auto options = "PRIMARY KEY AUTOINCREMENT"; };
+    static constexpr std::size_t unset_value = static_cast<std::size_t>(-1);
+    static constexpr auto name = "id_";
+    static constexpr auto options = "PRIMARY KEY";
+
+    Id(): Column<std::size_t>(-1) {}
+};

src/database/count_query.hpp

@@ -2,6 +2,7 @@
 
 #include <database/query.hpp>
 #include <database/table.hpp>
+#include <database/statement.hpp>
 
 #include <string>
 
@@ -15,20 +16,17 @@ struct CountQuery: public Query
       this->body += std::move(name);
     }
 
-    int64_t execute(sqlite3* db)
+    int64_t execute(DatabaseEngine& db)
     {
-      auto statement = this->prepare(db);
+      auto statement = db.prepare(this->body);
       int64_t res = 0;
-      if (sqlite3_step(statement.get()) == SQLITE_ROW)
+      if (statement->step() != StepResult::Error)
-        res = sqlite3_column_int64(statement.get(), 0);
+        res = statement->get_column_int64(0);
       else
         {
           log_error("Count request didn’t return a result");
           return 0;
         }
-      if (sqlite3_step(statement.get()) != SQLITE_DONE)
-        log_warning("Count request returned more than one result.");
-
       return res;
     }
 };

src/database/database.cpp

@@ -7,16 +7,21 @@
 #include <utils/time.hpp>
 
 #include <config/config.hpp>
+#include <database/sqlite3_engine.hpp>
+#include <database/postgresql_engine.hpp>
 
+#include <database/engine.hpp>
 #include <database/index.hpp>
 
+#include <memory>
+
 #include <sqlite3.h>
 
-sqlite3* Database::db;
+std::unique_ptr<DatabaseEngine> Database::db;
-Database::MucLogLineTable Database::muc_log_lines("MucLogLine_");
+Database::MucLogLineTable Database::muc_log_lines("muclogline_");
-Database::GlobalOptionsTable Database::global_options("GlobalOptions_");
+Database::GlobalOptionsTable Database::global_options("globaloptions_");
-Database::IrcServerOptionsTable Database::irc_server_options("IrcServerOptions_");
+Database::IrcServerOptionsTable Database::irc_server_options("ircserveroptions_");
-Database::IrcChannelOptionsTable Database::irc_channel_options("IrcChannelOptions_");
+Database::IrcChannelOptionsTable Database::irc_channel_options("ircchanneloptions_");
 Database::RosterTable Database::roster("roster");
 std::map<Database::CacheKey, Database::EncodingIn::real_type> Database::encoding_in_cache{};
 
@@ -29,27 +34,26 @@ void Database::open(const std::string& filename)
   // Try to open the specified database.
   // Close and replace the previous database pointer if it succeeded. If it did
   // not, just leave things untouched
-  sqlite3* new_db;
+  std::unique_ptr<DatabaseEngine> new_db;
-  auto res = sqlite3_open_v2(filename.data(), &new_db, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, nullptr);
+  static const auto psql_prefix = "postgresql://"s;
-  Database::close();
+  if (filename.substr(0, psql_prefix.size()) == psql_prefix)
-  if (res != SQLITE_OK)
+    new_db = PostgresqlEngine::open("dbname="s + filename.substr(psql_prefix.size()));
-    {
+  else
-      log_error("Failed to open database file ", filename, ": ", sqlite3_errmsg(new_db));
+    new_db = Sqlite3Engine::open(filename);
-      sqlite3_close(new_db);
+  if (!new_db)
-      throw std::runtime_error("");
+    return;
-    }
+  Database::db = std::move(new_db);
-  Database::db = new_db;
+  Database::muc_log_lines.create(*Database::db);
-  Database::muc_log_lines.create(Database::db);
+  Database::muc_log_lines.upgrade(*Database::db);
-  Database::muc_log_lines.upgrade(Database::db);
+  Database::global_options.create(*Database::db);
-  Database::global_options.create(Database::db);
+  Database::global_options.upgrade(*Database::db);
-  Database::global_options.upgrade(Database::db);
+  Database::irc_server_options.create(*Database::db);
-  Database::irc_server_options.create(Database::db);
+  Database::irc_server_options.upgrade(*Database::db);
-  Database::irc_server_options.upgrade(Database::db);
+  Database::irc_channel_options.create(*Database::db);
-  Database::irc_channel_options.create(Database::db);
+  Database::irc_channel_options.upgrade(*Database::db);
-  Database::irc_channel_options.upgrade(Database::db);
+  Database::roster.create(*Database::db);
-  Database::roster.create(Database::db);
+  Database::roster.upgrade(*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());
-  create_index<Database::Owner, Database::IrcChanName, Database::IrcServerName>(Database::db, "archive_index", Database::muc_log_lines.get_name());
 }
 
 
@@ -59,7 +63,7 @@ Database::GlobalOptions Database::get_global_options(const std::string& owner)
   request.where() << Owner{} << "=" << owner;
 
   Database::GlobalOptions options{Database::global_options.get_name()};
-  auto result = request.execute(Database::db);
+  auto result = request.execute(*Database::db);
   if (result.size() == 1)
     options = result.front();
   else
@@ -73,7 +77,7 @@ Database::IrcServerOptions Database::get_irc_server_options(const std::string& o
   request.where() << Owner{} << "=" << owner << " and " << Server{} << "=" << server;
 
   Database::IrcServerOptions options{Database::irc_server_options.get_name()};
-  auto result = request.execute(Database::db);
+  auto result = request.execute(*Database::db);
   if (result.size() == 1)
     options = result.front();
   else
@@ -91,7 +95,7 @@ Database::IrcChannelOptions Database::get_irc_channel_options(const std::string&
           " and " << Server{} << "=" << server <<\
           " and " << Channel{} << "=" << channel;
   Database::IrcChannelOptions options{Database::irc_channel_options.get_name()};
-  auto result = request.execute(Database::db);
+  auto result = request.execute(*Database::db);
   if (result.size() == 1)
     options = result.front();
   else
@@ -186,7 +190,7 @@ std::vector<Database::MucLogLine> Database::get_muc_logs(const std::string& owne
   if (limit >= 0)
     request.limit() << limit;
 
-  auto result = request.execute(Database::db);
+  auto result = request.execute(*Database::db);
 
   return {result.crbegin(), result.crend()};
 }
@@ -207,7 +211,7 @@ void Database::delete_roster_item(const std::string& local, const std::string& r
   query << " WHERE " << Database::RemoteJid{} << "=" << remote << \
            " AND " << Database::LocalJid{} << "=" << local;
 
-  query.execute(Database::db);
+//  query.execute(*Database::db);
 }
 
 bool Database::has_roster_item(const std::string& local, const std::string& remote)
@@ -216,7 +220,7 @@ bool Database::has_roster_item(const std::string& local, const std::string& remo
   query.where() << Database::LocalJid{} << "=" << local << \
         " and " << Database::RemoteJid{} << "=" << remote;
 
-  auto res = query.execute(Database::db);
+  auto res = query.execute(*Database::db);
 
   return !res.empty();
 }
@@ -226,20 +230,19 @@ std::vector<Database::RosterItem> Database::get_contact_list(const std::string&
   auto query = Database::roster.select();
   query.where() << Database::LocalJid{} << "=" << local;
 
-  return query.execute(Database::db);
+  return query.execute(*Database::db);
 }
 
 std::vector<Database::RosterItem> Database::get_full_roster()
 {
   auto query = Database::roster.select();
 
-  return query.execute(Database::db);
+  return query.execute(*Database::db);
 }
 
 void Database::close()
 {
-  sqlite3_close(Database::db);
+  Database::db.release();
-  Database::db = nullptr;
 }
 
 std::string Database::gen_uuid()

src/database/database.hpp

@@ -7,6 +7,8 @@
 #include <database/column.hpp>
 #include <database/count_query.hpp>
 
+#include <database/engine.hpp>
+
 #include <utils/optional_bool.hpp>
 
 #include <chrono>
@@ -25,11 +27,11 @@ class Database
 
   struct Owner: Column<std::string> { static constexpr auto name = "owner_"; };
 
-  struct IrcChanName: Column<std::string> { static constexpr auto name = "ircChanName_"; };
+  struct IrcChanName: Column<std::string> { static constexpr auto name = "ircchanname_"; };
 
   struct Channel: Column<std::string> { static constexpr auto name = "channel_"; };
 
-  struct IrcServerName: Column<std::string> { static constexpr auto name = "ircServerName_"; };
+  struct IrcServerName: Column<std::string> { static constexpr auto name = "ircservername_"; };
 
   struct Server: Column<std::string> { static constexpr auto name = "server_"; };
 
@@ -44,30 +46,30 @@ class Database
   struct Ports: Column<std::string> { static constexpr auto name = "ports_";
     Ports(): Column<std::string>("6667") {} };
 
-  struct TlsPorts: Column<std::string> { static constexpr auto name = "tlsPorts_";
+  struct TlsPorts: Column<std::string> { static constexpr auto name = "tlsports_";
     TlsPorts(): Column<std::string>("6697;6670") {} };
 
   struct Username: Column<std::string> { static constexpr auto name = "username_"; };
 
   struct Realname: Column<std::string> { static constexpr auto name = "realname_"; };
 
-  struct AfterConnectionCommand: Column<std::string> { static constexpr auto name = "afterConnectionCommand_"; };
+  struct AfterConnectionCommand: Column<std::string> { static constexpr auto name = "afterconnectioncommand_"; };
 
-  struct TrustedFingerprint: Column<std::string> { static constexpr auto name = "trustedFingerprint_"; };
+  struct TrustedFingerprint: Column<std::string> { static constexpr auto name = "trustedfingerprint_"; };
 
-  struct EncodingOut: Column<std::string> { static constexpr auto name = "encodingOut_"; };
+  struct EncodingOut: Column<std::string> { static constexpr auto name = "encodingout_"; };
 
-  struct EncodingIn: Column<std::string> { static constexpr auto name = "encodingIn_"; };
+  struct EncodingIn: Column<std::string> { static constexpr auto name = "encodingin_"; };
 
-  struct MaxHistoryLength: Column<int> { static constexpr auto name = "maxHistoryLength_";
+  struct MaxHistoryLength: Column<int> { static constexpr auto name = "maxhistorylength_";
     MaxHistoryLength(): Column<int>(20) {} };
 
-  struct RecordHistory: Column<bool> { static constexpr auto name = "recordHistory_";
+  struct RecordHistory: Column<bool> { static constexpr auto name = "recordhistory_";
     RecordHistory(): Column<bool>(true) {}};
 
-  struct RecordHistoryOptional: Column<OptionalBool> { static constexpr auto name = "recordHistory_"; };
+  struct RecordHistoryOptional: Column<OptionalBool> { static constexpr auto name = "recordhistory_"; };
 
-  struct VerifyCert: Column<bool> { static constexpr auto name = "verifyCert_";
+  struct VerifyCert: Column<bool> { static constexpr auto name = "verifycert_";
     VerifyCert(): Column<bool>(true) {} };
 
   struct Persistent: Column<bool> { static constexpr auto name = "persistent_";
@@ -134,7 +136,7 @@ class Database
   static int64_t count(const TableType& table)
   {
     CountQuery query{table.get_name()};
-    return query.execute(Database::db);
+    return query.execute(*Database::db);
   }
 
   static MucLogLineTable muc_log_lines;
@@ -142,7 +144,7 @@ class Database
   static IrcServerOptionsTable irc_server_options;
   static IrcChannelOptionsTable irc_channel_options;
   static RosterTable roster;
-  static sqlite3* db;
+  static std::unique_ptr<DatabaseEngine> db;
 
   /**
    * Some caches, to avoid doing very frequent query requests for a few options.
@@ -177,6 +179,11 @@ class Database
     Database::encoding_in_cache.clear();
   }
 
+  static auto raw_exec(const std::string& query)
+  {
+    Database::db->raw_exec(query);
+  }
+
  private:
   static std::string gen_uuid();
   static std::map<CacheKey, EncodingIn::real_type> encoding_in_cache;

src/database/engine.hpp

@@ -0,0 +1,40 @@
+#pragma once
+
+/**
+ * Interface to provide non-portable behaviour, specific to each
+ * database engine we want to support.
+ *
+ * Everything else (all portable stuf) should go outside of this class.
+ */
+
+#include <database/statement.hpp>
+
+#include <memory>
+#include <string>
+#include <vector>
+#include <tuple>
+#include <set>
+
+class DatabaseEngine
+{
+ public:
+
+  DatabaseEngine() = default;
+
+  DatabaseEngine(const DatabaseEngine&) = delete;
+  DatabaseEngine& operator=(const DatabaseEngine&) = delete;
+  DatabaseEngine(DatabaseEngine&&) = delete;
+  DatabaseEngine& operator=(DatabaseEngine&&) = delete;
+
+  virtual std::set<std::string> get_all_columns_from_table(const std::string& table_name) = 0;
+  virtual std::tuple<bool, std::string> raw_exec(const std::string& query) = 0;
+  virtual std::unique_ptr<Statement> prepare(const std::string& query) = 0;
+  virtual void extract_last_insert_rowid(Statement& statement) = 0;
+  virtual std::string get_returning_id_sql_string(const std::string&)
+  {
+    return {};
+  }
+  virtual std::string id_column_type() = 0;
+
+  int64_t last_inserted_rowid{-1};
+};

src/database/index.hpp

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <sqlite3.h>
+#include <database/engine.hpp>
 
 #include <string>
 #include <tuple>
@@ -25,18 +25,14 @@ add_column_name(std::string& out)
 }
 
 template <typename... Columns>
-void create_index(sqlite3* db, const std::string& name, const std::string& table)
+void create_index(DatabaseEngine& db, const std::string& name, const std::string& table)
 {
-  std::string res{"CREATE INDEX IF NOT EXISTS "};
+  std::string query{"CREATE INDEX IF NOT EXISTS "};
-  res += name + " ON " + table + "(";
+  query += name + " ON " + table + "(";
-  add_column_name<0, Columns...>(res);
+  add_column_name<0, Columns...>(query);
-  res += ")";
+  query += ")";
 
-  char* error;
+  auto result = db.raw_exec(query);
-  const auto result = sqlite3_exec(db, res.data(), nullptr, nullptr, &error);
+  if (std::get<0>(result) == false)
-  if (result != SQLITE_OK)
+    log_error("Error executing query: ", std::get<1>(result));
-    {
-      log_error("Error executing query: ", error);
-      sqlite3_free(error);
-    }
 }

src/database/insert_query.hpp

@@ -12,62 +12,63 @@
 
 #include <sqlite3.h>
 
-template <int N, typename ColumnType, typename... T>
+template <std::size_t N=0, typename... T>
-typename std::enable_if<!std::is_same<std::decay_t<ColumnType>, Id>::value, void>::type
+typename std::enable_if<N < sizeof...(T), void>::type
-actual_bind(Statement& statement, std::vector<std::string>& params, const std::tuple<T...>&)
+update_autoincrement_id(std::tuple<T...>& columns, Statement& statement)
 {
-  const auto value = params.front();
+  using ColumnType = typename std::decay<decltype(std::get<N>(columns))>::type;
-  params.erase(params.begin());
+  if (std::is_same<ColumnType, Id>::value)
-  if (sqlite3_bind_text(statement.get(), N + 1, value.data(), static_cast<int>(value.size()), SQLITE_TRANSIENT) != SQLITE_OK)
+    {
-    log_error("Failed to bind ", value, " to param ", N);
+      log_debug("EXTRACTING LAST ID");
+      auto&& column = std::get<Id>(columns);
+    }
+  update_autoincrement_id<N+1>(columns, statement);
 }
 
-template <int N, typename ColumnType, typename... T>
+template <std::size_t N=0, typename... T>
-typename std::enable_if<std::is_same<std::decay_t<ColumnType>, Id>::value, void>::type
+typename std::enable_if<N == sizeof...(T), void>::type
-actual_bind(Statement& statement, std::vector<std::string>&, const std::tuple<T...>& columns)
+update_autoincrement_id(std::tuple<T...>&, Statement& statement)
-{
+{}
-  auto&& column = std::get<Id>(columns);
-  if (column.value != 0)
-    {
-      if (sqlite3_bind_int64(statement.get(), N + 1, static_cast<sqlite3_int64>(column.value)) != SQLITE_OK)
-        log_error("Failed to bind ", column.value, " to id.");
-    }
-  else if (sqlite3_bind_null(statement.get(), N + 1) != SQLITE_OK)
-    log_error("Failed to bind NULL to param ", N);
-}
 
 struct InsertQuery: public Query
 {
-  InsertQuery(const std::string& name):
+  template <typename... T>
-      Query("INSERT OR REPLACE INTO ")
+  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(const std::tuple<T...>& columns, sqlite3* db)
+  void execute(DatabaseEngine& db, std::tuple<T...>& columns)
   {
-    auto statement = this->prepare(db);
+    auto statement = db.prepare(this->body);
-    {
+    this->bind_param(columns, *statement);
-      this->bind_param(columns, statement);
+
-      if (sqlite3_step(statement.get()) != SQLITE_DONE)
+    if (statement->step() != StepResult::Error)
-        log_error("Failed to execute query: ", sqlite3_errmsg(db));
+      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)
+  bind_param(const std::tuple<T...>& columns, Statement& statement, int index=1)
   {
-    using ColumnType = typename std::remove_reference<decltype(std::get<N>(columns))>::type;
+    auto&& column = std::get<N>(columns);
+    using ColumnType = std::decay_t<decltype(column)>;
 
-    actual_bind<N, ColumnType>(statement, this->params, columns);
+    if (!std::is_same<ColumnType, Id>::value)
-    this->bind_param<N+1>(columns, statement);
+      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&)
+  bind_param(const std::tuple<T...>&, Statement&, int)
   {}
 
   template <typename... T>
@@ -80,18 +81,21 @@ struct InsertQuery: public Query
 
   template <int N=0, typename... T>
   typename std::enable_if<N < sizeof...(T), void>::type
-  insert_value(const std::tuple<T...>& columns)
+  insert_value(const std::tuple<T...>& columns, int index=1)
   {
-    this->body += "?";
+    using ColumnType = std::decay_t<decltype(std::get<N>(columns))>;
-    if (N != sizeof...(T) - 1)
+
-      this->body += ",";
+    if (!std::is_same<ColumnType, Id>::value)
-    this->body += " ";
+      {
-    add_param(*this, std::get<N>(columns));
+        this->body += "$" + std::to_string(index++);
-    this->insert_value<N+1>(columns);
+        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...>&)
+  insert_value(const std::tuple<T...>&, const int)
   { }
 
   template <typename... T>
@@ -99,27 +103,28 @@ struct InsertQuery: public Query
   {
     this->body += " (";
     this->insert_col_name(columns);
-    this->body += ")\n";
+    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 = typename std::remove_reference<decltype(std::get<N>(columns))>::type;
+    using ColumnType = std::decay_t<decltype(std::get<N>(columns))>;
 
-    this->body += ColumnType::name;
+    if (!std::is_same<ColumnType, Id>::value)
+      {
+        this->body += ColumnType::name;
 
-    if (N < (sizeof...(T) - 1))
+        if (N < (sizeof...(T) - 1))
-      this->body += ", ";
+          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...>&)
   {}
-
-
- private:
 };

src/database/postgresql_engine.cpp

@@ -0,0 +1,77 @@
+#include <database/postgresql_engine.hpp>
+
+#include <database/postgresql_statement.hpp>
+
+#include <logger/logger.hpp>
+
+PostgresqlEngine::PostgresqlEngine(PGconn*const conn):
+    conn(conn)
+{}
+
+PostgresqlEngine::~PostgresqlEngine()
+{
+  PQfinish(this->conn);
+}
+
+std::unique_ptr<DatabaseEngine> PostgresqlEngine::open(const std::string& conninfo)
+{
+  log_debug("trying to open: ", conninfo);
+  PGconn* con = PQconnectdb(conninfo.data());
+
+  if (!con)
+    {
+      log_error("Failed to allocate a Postgresql connection");
+      throw std::runtime_error("");
+    }
+  const auto status = PQstatus(con);
+  if (status != CONNECTION_OK)
+    {
+      const char* errmsg = PQerrorMessage(con);
+      log_error("Postgresql connection failed: ", errmsg);
+      throw std::runtime_error("failed to open connection.");
+    }
+  return std::make_unique<PostgresqlEngine>(con);
+}
+
+std::set<std::string> PostgresqlEngine::get_all_columns_from_table(const std::string& table_name)
+{
+  const auto query = "SELECT column_name from information_schema.columns where table_name='" + table_name + "'";
+  auto statement = this->prepare(query);
+  std::set<std::string> columns;
+
+  while (statement->step() == StepResult::Row)
+    columns.insert(statement->get_column_text(0));
+
+  log_debug("found ", columns.size(), " columns.");
+  return columns;
+}
+
+std::tuple<bool, std::string> PostgresqlEngine::raw_exec(const std::string& query)
+{
+  log_debug("raw_exec:", query);
+  PGresult* res = PQexec(this->conn, query.data());
+  auto res_status = PQresultStatus(res);
+  if (res_status != PGRES_COMMAND_OK)
+    return std::make_tuple(false, PQresultErrorMessage(res));
+  return std::make_tuple(true, std::string{});
+}
+
+std::unique_ptr<Statement> PostgresqlEngine::prepare(const std::string& query)
+{
+  return std::make_unique<PostgresqlStatement>(query, this->conn);
+}
+
+void PostgresqlEngine::extract_last_insert_rowid(Statement& statement)
+{
+  this->last_inserted_rowid = statement.get_column_int64(0);
+}
+
+std::string PostgresqlEngine::get_returning_id_sql_string(const std::string& col_name)
+{
+  return " RETURNING " + col_name;
+}
+
+std::string PostgresqlEngine::id_column_type()
+{
+  return "SERIAL";
+}

src/database/postgresql_engine.hpp

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <database/engine.hpp>
+
+#include <database/statement.hpp>
+
+#include <libpq-fe.h>
+
+#include <memory>
+#include <string>
+#include <tuple>
+#include <set>
+
+class PostgresqlEngine: public DatabaseEngine
+{
+ public:
+  PostgresqlEngine(PGconn*const conn);
+
+  ~PostgresqlEngine();
+
+  static std::unique_ptr<DatabaseEngine> open(const std::string& string);
+
+  std::set<std::string> get_all_columns_from_table(const std::string& table_name) override final;
+  std::tuple<bool, std::string> raw_exec(const std::string& query) override final;
+  std::unique_ptr<Statement> prepare(const std::string& query) override;
+  void extract_last_insert_rowid(Statement& statement) override;
+  std::string get_returning_id_sql_string(const std::string& col_name) override;
+  std::string id_column_type() override;
+private:
+  PGconn* const conn;
+};

src/database/postgresql_statement.hpp

@@ -0,0 +1,128 @@
+#pragma once
+
+#include <database/statement.hpp>
+
+#include <logger/logger.hpp>
+
+#include <libpq-fe.h>
+
+class PostgresqlStatement: public Statement
+{
+ public:
+  PostgresqlStatement(std::string body, PGconn*const conn):
+      body(std::move(body)),
+      conn(conn)
+  {}
+  ~PostgresqlStatement()
+  {}
+  PostgresqlStatement(const PostgresqlStatement&) = delete;
+  PostgresqlStatement& operator=(const PostgresqlStatement&) = delete;
+  PostgresqlStatement(PostgresqlStatement&& other) = delete;
+  PostgresqlStatement& operator=(PostgresqlStatement&& other) = delete;
+
+  StepResult step() override final
+  {
+    if (!this->executed)
+      {
+        this->current_tuple = 0;
+        this->executed = true;
+        if (!this->execute())
+          return StepResult::Error;
+      }
+    else
+      {
+        this->current_tuple++;
+      }
+    if (this->current_tuple < PQntuples(this->result))
+      return StepResult::Row;
+    return StepResult::Done;
+  }
+
+  int64_t get_column_int64(const int col) override
+  {
+    const char* result = PQgetvalue(this->result, this->current_tuple, col);
+    std::istringstream iss;
+    iss.str(result);
+    int64_t res;
+    iss >> res;
+    return res;
+  }
+  std::string get_column_text(const int col) override
+  {
+    const char* result = PQgetvalue(this->result, this->current_tuple, col);
+    return result;
+  }
+  int get_column_int(const int col) override
+  {
+    const char* result = PQgetvalue(this->result, this->current_tuple, col);
+    std::istringstream iss;
+    iss.str(result);
+    int res;
+    iss >> res;
+    return res;
+  }
+
+  void bind(std::vector<std::string> params) override
+  {
+
+    this->params = std::move(params);
+  }
+
+  bool bind_text(const int, const std::string& data) override
+  {
+    this->params.push_back(data);
+    return true;
+  }
+  bool bind_int64(const int pos, const std::int64_t value) override
+  {
+    this->params.push_back(std::to_string(value));
+    return true;
+  }
+  bool bind_null(const int pos) override
+  {
+    this->params.push_back("NULL");
+    return true;
+  }
+
+ private:
+
+private:
+  bool execute()
+  {
+    std::vector<const char*> params;
+    params.reserve(this->params.size());
+
+    for (const auto& param: this->params)
+      {
+        log_debug("param:", param);
+        params.push_back(param.data());
+      }
+
+    log_debug("body: ", body);
+    this->result = PQexecParams(this->conn, this->body.data(),
+                                this->params.size(),
+                                nullptr,
+                                params.data(),
+                                nullptr,
+                                nullptr,
+                                0);
+    const auto status = PQresultStatus(this->result);
+    if (status == PGRES_TUPLES_OK)
+      {
+        log_debug("PGRES_TUPLES_OK");
+      }
+    else if (status != PGRES_COMMAND_OK)
+      {
+        log_error("Failed to execute command: ", PQresultErrorMessage(this->result));
+        return false;
+      }
+    return true;
+  }
+
+  bool executed{false};
+  std::string body;
+  PGconn*const conn;
+  std::vector<std::string> params;
+  PGresult* result{nullptr};
+  int current_tuple{0};
+};

src/database/query.cpp

@@ -1,9 +1,29 @@
 #include <database/query.hpp>
 #include <database/column.hpp>
 
-template <>
+void actual_bind(Statement& statement, const std::string& value, int index)
-void add_param<Id>(Query&, const Id&)
+{
-{}
+  log_debug("binding string:", value, " to col ", index);
+  statement.bind_text(index, value);
+}
+
+void actual_bind(Statement& statement, const std::size_t value, int index)
+{
+  log_debug("binding size_t:", value);
+  statement.bind_int64(index, value);
+}
+
+void actual_bind(Statement& statement, const OptionalBool& value, int index)
+{
+  log_debug("binding optional_t:", value.to_string());
+  if (!value.is_set)
+    statement.bind_int64(index, 0);
+  else if (value.value)
+    statement.bind_int64(index, 1);
+  else
+    statement.bind_int64(index, -1);
+}
+
 
 void actual_add_param(Query& query, const std::string& val)
 {
@@ -28,7 +48,8 @@ Query& operator<<(Query& query, const char* str)
 
 Query& operator<<(Query& query, const std::string& str)
 {
-  query.body += "?";
+  query.body += "$" + std::to_string(query.current_param);
+  query.current_param++;
   actual_add_param(query, str);
   return query;
 }

src/database/query.hpp

@@ -11,52 +11,27 @@
 
 #include <sqlite3.h>
 
+void actual_bind(Statement& statement, const std::string& value, int index);
+void actual_bind(Statement& statement, const std::size_t value, int index);
+void actual_bind(Statement& statement, const OptionalBool& value, int index);
+
 struct Query
 {
     std::string body;
     std::vector<std::string> params;
+    int current_param{1};
 
     Query(std::string str):
         body(std::move(str))
     {}
-
-    Statement prepare(sqlite3* db)
-    {
-      sqlite3_stmt* stmt;
-      auto res = sqlite3_prepare(db, this->body.data(), static_cast<int>(this->body.size()) + 1,
-                                 &stmt, nullptr);
-      if (res != SQLITE_OK)
-        {
-          log_error("Error preparing statement: ", sqlite3_errmsg(db));
-          return nullptr;
-        }
-      Statement statement(stmt);
-      int i = 1;
-      for (const std::string& param: this->params)
-        {
-          if (sqlite3_bind_text(statement.get(), i, param.data(), static_cast<int>(param.size()), SQLITE_TRANSIENT) != SQLITE_OK)
-            log_error("Failed to bind ", param, " to param ", i);
-          i++;
-        }
-
-      return statement;
-    }
-
-    void execute(sqlite3* db)
-    {
-      auto statement = this->prepare(db);
-      while (sqlite3_step(statement.get()) != SQLITE_DONE)
-        ;
-    }
 };
 
 template <typename ColumnType>
 void add_param(Query& query, const ColumnType& column)
 {
+  std::cout << "add_param<ColumnType>" << std::endl;
   actual_add_param(query, column.value);
 }
-template <>
-void add_param<Id>(Query& query, const Id& column);
 
 template <typename T>
 void actual_add_param(Query& query, const T& val)
@@ -81,7 +56,7 @@ template <typename Integer>
 typename std::enable_if<std::is_integral<Integer>::value, Query&>::type
 operator<<(Query& query, const Integer& i)
 {
-  query.body += "?";
+  query.body += "$" + std::to_string(query.current_param++);
   actual_add_param(query, i);
   return query;
 }

src/database/row.hpp

@@ -1,72 +1,73 @@
 #pragma once
 
 #include <database/insert_query.hpp>
+#include <database/update_query.hpp>
 #include <logger/logger.hpp>
 
+#include <utils/is_one_of.hpp>
+
 #include <type_traits>
 
 #include <sqlite3.h>
 
-template <typename ColumnType, typename... T>
-typename std::enable_if<!std::is_same<std::decay_t<ColumnType>, Id>::value, void>::type
-update_id(std::tuple<T...>&, sqlite3*)
-{}
-
-template <typename ColumnType, typename... T>
-typename std::enable_if<std::is_same<std::decay_t<ColumnType>, Id>::value, void>::type
-update_id(std::tuple<T...>& columns, sqlite3* db)
-{
-  auto&& column = std::get<ColumnType>(columns);
-  auto res = sqlite3_last_insert_rowid(db);
-  column.value = static_cast<Id::real_type>(res);
-}
-
-template <std::size_t N=0, typename... T>
-typename std::enable_if<N < sizeof...(T), void>::type
-update_autoincrement_id(std::tuple<T...>& columns, sqlite3* db)
-{
-  using ColumnType = typename std::remove_reference<decltype(std::get<N>(columns))>::type;
-  update_id<ColumnType>(columns, db);
-  update_autoincrement_id<N+1>(columns, db);
-}
-
-template <std::size_t N=0, typename... T>
-typename std::enable_if<N == sizeof...(T), void>::type
-update_autoincrement_id(std::tuple<T...>&, sqlite3*)
-{}
-
 template <typename... T>
 struct Row
 {
-    Row(std::string name):
+  Row(std::string name):
-    table_name(std::move(name))
+      table_name(std::move(name))
-    {}
+  {}
 
-    template <typename Type>
+  template <typename Type>
-    typename Type::real_type& col()
+  typename Type::real_type& col()
-    {
+  {
-      auto&& col = std::get<Type>(this->columns);
+    auto&& col = std::get<Type>(this->columns);
-      return col.value;
+    return col.value;
-    }
+  }
 
-    template <typename Type>
+  template <typename Type>
-    const auto& col() const
+  const auto& col() const
-    {
+  {
-      auto&& col = std::get<Type>(this->columns);
+    auto&& col = std::get<Type>(this->columns);
-      return col.value;
+    return col.value;
-    }
+  }
 
-    void save(sqlite3* db)
+  template <bool Coucou=true>
-    {
+  void save(std::unique_ptr<DatabaseEngine>& db,  typename std::enable_if<!is_one_of<Id, T...> && Coucou>::type* = nullptr)
-      InsertQuery query(this->table_name);
+  {
-      query.insert_col_names(this->columns);
+    this->insert(*db);
-      query.insert_values(this->columns);
+  }
 
-      query.execute(this->columns, db);
+  template <bool Coucou=true>
+  void save(std::unique_ptr<DatabaseEngine>& db,  typename std::enable_if<is_one_of<Id, T...> && Coucou>::type* = nullptr)
+  {
+    const Id& id = std::get<Id>(this->columns);
+    if (id.value == Id::unset_value)
+      {
+        this->insert(*db);
+        std::get<Id>(this->columns).value = db->last_inserted_rowid;
+      }
+    else
+      this->update(*db);
+  }
 
-      update_autoincrement_id(this->columns, db);
+ private:
-    }
+  void insert(DatabaseEngine& db)
+  {
+    InsertQuery query(this->table_name, this->columns);
+    // Ugly workaround for non portable stuff
+    query.body += db.get_returning_id_sql_string(Id::name);
+    query.execute(db, this->columns);
+  }
+
+  void update(DatabaseEngine& db)
+  {
+    UpdateQuery query(this->table_name, this->columns);
+
+    query.execute(db, this->columns);
+  }
+
+public:
+  std::tuple<T...> columns;
+  std::string table_name;
 
-    std::tuple<T...> columns;
-    std::string table_name;
 };

src/database/select_query.hpp

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <database/engine.hpp>
+
 #include <database/statement.hpp>
 #include <database/query.hpp>
 #include <logger/logger.hpp>
@@ -18,24 +20,21 @@ template <typename T>
 typename std::enable_if<std::is_integral<T>::value, sqlite3_int64>::type
 extract_row_value(Statement& statement, const int i)
 {
-  return sqlite3_column_int64(statement.get(), i);
+  return statement.get_column_int64(i);
 }
 
 template <typename T>
 typename std::enable_if<std::is_same<std::string, T>::value, T>::type
 extract_row_value(Statement& statement, const int i)
 {
-  const auto size = sqlite3_column_bytes(statement.get(), i);
+  return statement.get_column_text(i);
-  const unsigned char* str = sqlite3_column_text(statement.get(), i);
-  std::string result(reinterpret_cast<const char*>(str), static_cast<std::size_t>(size));
-  return result;
 }
 
 template <typename T>
 typename std::enable_if<std::is_same<OptionalBool, T>::value, T>::type
 extract_row_value(Statement& statement, const int i)
 {
-  const auto integer = sqlite3_column_int(statement.get(), i);
+  const auto integer = statement.get_column_int(i);
   OptionalBool result;
   if (integer > 0)
     result.set_value(true);
@@ -109,16 +108,21 @@ struct SelectQuery: public Query
       return *this;
     }
 
-    auto execute(sqlite3* db)
+    auto execute(DatabaseEngine& db)
     {
-      auto statement = this->prepare(db);
       std::vector<Row<T...>> rows;
-      while (sqlite3_step(statement.get()) == SQLITE_ROW)
+
+      auto statement = db.prepare(this->body);
+      statement->bind(std::move(this->params));
+
+      while (statement->step() == StepResult::Row)
         {
+          log_debug("one result.");
           Row<T...> row(this->table_name);
-          extract_row_values(row, statement);
+          extract_row_values(row, *statement);
           rows.push_back(row);
         }
+
       return rows;
     }
 

src/database/sqlite3_engine.cpp

@@ -0,0 +1,93 @@
+#include <database/sqlite3_engine.hpp>
+
+#include <database/sqlite3_statement.hpp>
+
+#include <utils/tolower.hpp>
+#include <logger/logger.hpp>
+#include <vector>
+
+Sqlite3Engine::Sqlite3Engine(sqlite3* db):
+    db(db)
+{
+}
+
+Sqlite3Engine::~Sqlite3Engine()
+{
+  sqlite3_close(this->db);
+}
+
+std::set<std::string> Sqlite3Engine::get_all_columns_from_table(const std::string& table_name)
+{
+  std::set<std::string> result;
+  char* errmsg;
+  std::string query{"PRAGMA table_info(" + table_name + ")"};
+  int res = sqlite3_exec(this->db, query.data(), [](void* param, int columns_nb, char** columns, char**) -> int {
+    constexpr int name_column = 1;
+    std::set<std::string>* result = static_cast<std::set<std::string>*>(param);
+    if (name_column < columns_nb)
+      result->insert(utils::tolower(columns[name_column]));
+    return 0;
+  }, &result, &errmsg);
+
+  if (res != SQLITE_OK)
+    {
+      log_error("Error executing ", query, ": ", errmsg);
+      sqlite3_free(errmsg);
+    }
+
+  log_debug("List of columns in table ", table_name, ":");
+  for (const auto& c: result)
+    log_debug(c);
+  return result;
+}
+
+std::unique_ptr<DatabaseEngine> Sqlite3Engine::open(const std::string& filename)
+{
+  sqlite3* new_db;
+  auto res = sqlite3_open_v2(filename.data(), &new_db, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, nullptr);
+  if (res != SQLITE_OK)
+    {
+      log_error("Failed to open database file ", filename, ": ", sqlite3_errmsg(new_db));
+      sqlite3_close(new_db);
+      throw std::runtime_error("");
+    }
+  return std::make_unique<Sqlite3Engine>(new_db);
+}
+
+std::tuple<bool, std::string> Sqlite3Engine::raw_exec(const std::string& query)
+{
+  char* error;
+  const auto result = sqlite3_exec(db, query.data(), nullptr, nullptr, &error);
+  if (result != SQLITE_OK)
+    {
+      std::string err_msg(error);
+      sqlite3_free(error);
+      return std::make_tuple(false, err_msg);
+    }
+  return std::make_tuple(true, std::string{});
+}
+
+std::unique_ptr<Statement> Sqlite3Engine::prepare(const std::string& query)
+{
+  sqlite3_stmt* stmt;
+  log_debug("SQLITE3: ", query);
+  auto res = sqlite3_prepare(db, query.data(), static_cast<int>(query.size()) + 1,
+                             &stmt, nullptr);
+  if (res != SQLITE_OK)
+    {
+      log_error("Error preparing statement: ", sqlite3_errmsg(db));
+      return nullptr;
+    }
+  return std::make_unique<Sqlite3Statement>(stmt);
+}
+
+void Sqlite3Engine::extract_last_insert_rowid(Statement& statement)
+{
+  this->last_inserted_rowid = sqlite3_last_insert_rowid(this->db);
+  log_debug("extracted inserted ID: ", this->last_inserted_rowid);
+}
+
+std::string Sqlite3Engine::id_column_type()
+{
+  return "INTEGER PRIMARY KEY AUTOINCREMENT";
+}

src/database/sqlite3_engine.hpp

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <database/engine.hpp>
+
+#include <database/statement.hpp>
+
+#include <sqlite3.h>
+#include <memory>
+#include <string>
+#include <tuple>
+#include <set>
+
+class Sqlite3Engine: public DatabaseEngine
+{
+ public:
+  Sqlite3Engine(sqlite3* db);
+
+  ~Sqlite3Engine();
+
+  static std::unique_ptr<DatabaseEngine> open(const std::string& string);
+
+  std::set<std::string> get_all_columns_from_table(const std::string& table_name) override final;
+  std::tuple<bool, std::string> raw_exec(const std::string& query) override final;
+  std::unique_ptr<Statement> prepare(const std::string& query) override;
+  void extract_last_insert_rowid(Statement& statement) override;
+  std::string id_column_type() override;
+private:
+  sqlite3* const db;
+};
+

src/database/sqlite3_statement.hpp

@@ -0,0 +1,93 @@
+#pragma once
+
+#include <database/statement.hpp>
+
+#include <logger/logger.hpp>
+
+#include <sqlite3.h>
+
+class Sqlite3Statement: public Statement
+{
+ public:
+  Sqlite3Statement(sqlite3_stmt* stmt):
+      stmt(stmt) {}
+  ~Sqlite3Statement()
+  {
+    sqlite3_finalize(this->stmt);
+  }
+
+  StepResult step() override final
+  {
+    auto res = sqlite3_step(this->get());
+    log_debug("step: ", res);
+    if (res == SQLITE_ROW)
+      return StepResult::Row;
+    else if (res == SQLITE_DONE)
+      return StepResult::Done;
+    else
+      return StepResult::Error;
+  }
+
+  void bind(std::vector<std::string> params) override
+  {
+  int i = 1;
+  for (const std::string& param: params)
+    {
+      if (sqlite3_bind_text(this->get(), i, param.data(), static_cast<int>(param.size()), SQLITE_TRANSIENT) != SQLITE_OK)
+        log_error("Failed to bind ", param, " to param ", i);
+      i++;
+    }
+  }
+
+  int64_t get_column_int64(const int col) override
+  {
+    return sqlite3_column_int64(this->get(), col);
+  }
+
+  std::string get_column_text(const int col) override
+  {
+    const auto size = sqlite3_column_bytes(this->get(), col);
+    const unsigned char* str = sqlite3_column_text(this->get(), col);
+    std::string result(reinterpret_cast<const char*>(str), static_cast<std::size_t>(size));
+    return result;
+  }
+
+  bool bind_text(const int pos, const std::string& data) override
+  {
+    return sqlite3_bind_text(this->get(), pos, data.data(), static_cast<int>(data.size()), SQLITE_TRANSIENT) == SQLITE_OK;
+  }
+  bool bind_int64(const int pos, const std::int64_t value) override
+  {
+    return sqlite3_bind_int64(this->get(), pos, static_cast<sqlite3_int64>(value)) == SQLITE_OK;
+  }
+  bool bind_null(const int pos) override
+  {
+    return sqlite3_bind_null(this->get(), pos) == SQLITE_OK;
+  }
+  int get_column_int(const int col) override
+  {
+    return sqlite3_column_int(this->get(), col);
+  }
+
+  Sqlite3Statement(const Sqlite3Statement&) = delete;
+  Sqlite3Statement& operator=(const Sqlite3Statement&) = delete;
+  Sqlite3Statement(Sqlite3Statement&& other):
+      stmt(other.stmt)
+  {
+    other.stmt = nullptr;
+  }
+  Sqlite3Statement& operator=(Sqlite3Statement&& other)
+  {
+    this->stmt = other.stmt;
+    other.stmt = nullptr;
+    return *this;
+  }
+  sqlite3_stmt* get()
+  {
+    return this->stmt;
+  }
+
+ private:
+  sqlite3_stmt* stmt;
+  int last_step_result{SQLITE_OK};
+};

src/database/statement.hpp

@@ -1,35 +1,28 @@
 #pragma once
 
-#include <sqlite3.h>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+enum class StepResult
+{
+  Row,
+  Done,
+  Error,
+};
 
 class Statement
 {
  public:
-  Statement(sqlite3_stmt* stmt):
+  virtual StepResult step() = 0;
-      stmt(stmt) {}
-  ~Statement()
-  {
-    sqlite3_finalize(this->stmt);
-  }
 
-  Statement(const Statement&) = delete;
+  virtual void bind(std::vector<std::string> params) = 0;
-  Statement& operator=(const Statement&) = delete;
-  Statement(Statement&& other):
-      stmt(other.stmt)
-  {
-    other.stmt = nullptr;
-  }
-  Statement& operator=(Statement&& other)
-  {
-    this->stmt = other.stmt;
-    other.stmt = nullptr;
-    return *this;
-  }
-  sqlite3_stmt* get()
-  {
-    return this->stmt;
-  }
 
- private:
+  virtual std::int64_t get_column_int64(const int col) = 0;
-  sqlite3_stmt* stmt;
+  virtual std::string get_column_text(const int col) = 0;
+  virtual int get_column_int(const int col) = 0;
+
+  virtual bool bind_text(const int pos, const std::string& data) = 0;
+  virtual bool bind_int64(const int pos, const std::int64_t value) = 0;
+  virtual bool bind_null(const int pos) = 0;
 };

src/database/table.cpp

@@ -1,23 +0,0 @@
-#include <database/table.hpp>
-
-std::set<std::string> get_all_columns_from_table(sqlite3* db, const std::string& table_name)
-{
-  std::set<std::string> result;
-  char* errmsg;
-  std::string query{"PRAGMA table_info(" + table_name + ")"};
-  int res = sqlite3_exec(db, query.data(), [](void* param, int columns_nb, char** columns, char**) -> int {
-    constexpr int name_column = 1;
-    std::set<std::string>* result = static_cast<std::set<std::string>*>(param);
-    if (name_column < columns_nb)
-      result->insert(columns[name_column]);
-    return 0;
-  }, &result, &errmsg);
-
-  if (res != SQLITE_OK)
-    {
-      log_error("Error executing ", query, ": ", errmsg);
-      sqlite3_free(errmsg);
-    }
-
-  return result;
-}

src/database/table.hpp

@@ -1,7 +1,8 @@
 #pragma once
 
+#include <database/engine.hpp>
+
 #include <database/select_query.hpp>
-#include <database/type_to_sql.hpp>
 #include <database/row.hpp>
 
 #include <algorithm>
@@ -10,22 +11,26 @@
 
 using namespace std::string_literals;
 
-std::set<std::string> get_all_columns_from_table(sqlite3* db, const std::string& table_name);
+template <typename T>
-
+std::string ToSQLType(DatabaseEngine& db)
-template <typename ColumnType>
-void add_column_to_table(sqlite3* db, const std::string& table_name)
 {
-  const std::string name = ColumnType::name;
+  if (std::is_same<T, Id>::value)
-  std::string query{"ALTER TABLE " + table_name + " ADD " + ColumnType::name + " " + TypeToSQLType<typename ColumnType::real_type>::type};
+    return db.id_column_type();
-  char* error;
+  else if (std::is_same<typename T::real_type, std::string>::value)
-  const auto result = sqlite3_exec(db, query.data(), nullptr, nullptr, &error);
+    return "TEXT";
-  if (result != SQLITE_OK)
+  else
-    {
+    return "INTEGER";
-      log_error("Error adding column ", name, " to table ", table_name, ": ",  error);
-      sqlite3_free(error);
-    }
 }
 
+template <typename ColumnType>
+void add_column_to_table(DatabaseEngine& db, const std::string& table_name)
+{
+  const std::string name = ColumnType::name;
+  std::string query{"ALTER TABLE " + table_name + " ADD " + ColumnType::name + " " + ToSQLType<ColumnType>(db)};
+  auto res = db.raw_exec(query);
+  if (std::get<0>(res) == false)
+    log_error("Error adding column ", name, " to table ", table_name, ": ",  std::get<1>(res));
+}
 
 template <typename ColumnType, decltype(ColumnType::options) = nullptr>
 void append_option(std::string& s)
@@ -50,27 +55,24 @@ class Table
       name(std::move(name))
   {}
 
-  void upgrade(sqlite3* db)
+  void upgrade(DatabaseEngine& db)
   {
-    const auto existing_columns = get_all_columns_from_table(db, this->name);
+    const auto existing_columns = db.get_all_columns_from_table(this->name);
     add_column_if_not_exists(db, existing_columns);
   }
 
-  void create(sqlite3* db)
+  void create(DatabaseEngine& db)
   {
-    std::string res{"CREATE TABLE IF NOT EXISTS "};
+    std::string query{"CREATE TABLE IF NOT EXISTS "};
-    res += this->name;
+    query += this->name;
-    res += " (\n";
+    query += " (\n";
-    this->add_column_create(res);
+    this->add_column_create(db, query);
-    res += ")";
+    query += ")";
 
-    char* error;
+    log_debug("create:" , query);
-    const auto result = sqlite3_exec(db, res.data(), nullptr, nullptr, &error);
+    auto result = db.raw_exec(query);
-    if (result != SQLITE_OK)
+    if (std::get<0>(result) == false)
-      {
+      log_error("Error executing query: ", std::get<1>(result));
-        log_error("Error executing query: ", error);
-        sqlite3_free(error);
-      }
   }
 
   RowType row()
@@ -78,7 +80,7 @@ class Table
     return {this->name};
   }
 
-  SelectQuery<T...> select()
+  auto select()
   {
     SelectQuery<T...> select(this->name);
     return select;
@@ -93,39 +95,44 @@ class Table
 
   template <std::size_t N=0>
   typename std::enable_if<N < sizeof...(T), void>::type
-  add_column_if_not_exists(sqlite3* db, const std::set<std::string>& existing_columns)
+  add_column_if_not_exists(DatabaseEngine& db, const std::set<std::string>& existing_columns)
   {
     using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type;
-    if (existing_columns.count(ColumnType::name) != 1)
+    if (existing_columns.count(ColumnType::name) == 0)
-      {
+      add_column_to_table<ColumnType>(db, this->name);
-        add_column_to_table<ColumnType>(db, this->name);
-      }
     add_column_if_not_exists<N+1>(db, existing_columns);
   }
   template <std::size_t N=0>
   typename std::enable_if<N == sizeof...(T), void>::type
-  add_column_if_not_exists(sqlite3*, const std::set<std::string>&)
+  add_column_if_not_exists(DatabaseEngine&, const std::set<std::string>&)
   {}
 
   template <std::size_t N=0>
   typename std::enable_if<N < sizeof...(T), void>::type
-  add_column_create(std::string& str)
+  add_column_create(DatabaseEngine& db, std::string& str)
   {
     using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type;
-    using RealType = typename ColumnType::real_type;
+//    using RealType = typename ColumnType::real_type;
     str += ColumnType::name;
     str += " ";
-    str += TypeToSQLType<RealType>::type;
+//    if (std::is_same<ColumnType, Id>::value)
-    append_option<ColumnType>(str);
+//      {
+//        str += "INTEGER PRIMARY KEY AUTOINCREMENT";
+//      }
+//    else
+//      {
+        str += ToSQLType<ColumnType>(db);
+//        append_option<ColumnType>(str);
+//      }
     if (N != sizeof...(T) - 1)
       str += ",";
     str += "\n";
 
-    add_column_create<N+1>(str);
+    add_column_create<N+1>(db, str);
   }
   template <std::size_t N=0>
   typename std::enable_if<N == sizeof...(T), void>::type
-  add_column_create(std::string&)
+  add_column_create(DatabaseEngine&, std::string&)
   { }
 
   const std::string name;

src/database/type_to_sql.cpp

@@ -1,9 +0,0 @@
-#include <database/type_to_sql.hpp>
-
-template <> const std::string TypeToSQLType<int>::type = "INTEGER";
-template <> const std::string TypeToSQLType<std::size_t>::type = "INTEGER";
-template <> const std::string TypeToSQLType<long>::type = "INTEGER";
-template <> const std::string TypeToSQLType<long long>::type = "INTEGER";
-template <> const std::string TypeToSQLType<bool>::type = "INTEGER";
-template <> const std::string TypeToSQLType<std::string>::type = "TEXT";
-template <> const std::string TypeToSQLType<OptionalBool>::type = "INTEGER";

src/database/type_to_sql.hpp

@@ -1,16 +0,0 @@
-#pragma once
-
-#include <utils/optional_bool.hpp>
-
-#include <string>
-
-template <typename T>
-struct TypeToSQLType { static const std::string type; };
-
-template <> const std::string TypeToSQLType<int>::type;
-template <> const std::string TypeToSQLType<std::size_t>::type;
-template <> const std::string TypeToSQLType<long>::type;
-template <> const std::string TypeToSQLType<long long>::type;
-template <> const std::string TypeToSQLType<bool>::type;
-template <> const std::string TypeToSQLType<std::string>::type;
-template <> const std::string TypeToSQLType<OptionalBool>::type;

src/database/update_query.hpp

@@ -0,0 +1,100 @@
+#pragma once
+
+#include <database/query.hpp>
+#include <database/engine.hpp>
+
+using namespace std::string_literals;
+
+template <class T, class... Tuple>
+struct Index;
+
+template <class T, class... Types>
+struct Index<T, std::tuple<T, Types...>>
+{
+  static const std::size_t value = 0;
+};
+
+template <class T, class U, class... Types>
+struct Index<T, std::tuple<U, Types...>>
+{
+  static const std::size_t value = Index<T, std::tuple<Types...>>::value + 1;
+};
+
+struct UpdateQuery: public Query
+{
+  template <typename... T>
+  UpdateQuery(const std::string& name, const std::tuple<T...>& columns):
+      Query("UPDATE ")
+  {
+    this->body += name;
+    this->insert_col_names_and_values(columns);
+  }
+
+  template <typename... T>
+  void insert_col_names_and_values(const std::tuple<T...>& columns)
+  {
+    this->body += " SET ";
+    this->insert_col_name_and_value(columns);
+    this->body += " WHERE "s + Id::name + "=$" + std::to_string(this->current_param);
+  }
+
+  template <int N=0, typename... T>
+  typename std::enable_if<N < sizeof...(T), void>::type
+  insert_col_name_and_value(const std::tuple<T...>& columns)
+  {
+    using ColumnType = std::decay_t<decltype(std::get<N>(columns))>;
+
+    if (!std::is_same<ColumnType, Id>::value)
+      {
+        this->body += ColumnType::name + "=$"s + std::to_string(this->current_param);
+        this->current_param++;
+
+        if (N < (sizeof...(T) - 1))
+          this->body += ", ";
+      }
+
+    this->insert_col_name_and_value<N+1>(columns);
+  }
+  template <int N=0, typename... T>
+  typename std::enable_if<N == sizeof...(T), void>::type
+  insert_col_name_and_value(const std::tuple<T...>&)
+  {}
+
+
+  template <typename... T>
+  void execute(DatabaseEngine& db, const std::tuple<T...>& columns)
+  {
+    auto statement = db.prepare(this->body);
+    this->bind_param(columns, *statement);
+    this->bind_id(columns, *statement);
+
+    statement->step();
+  }
+
+  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 bind_id(const std::tuple<T...>& columns, Statement& statement)
+  {
+    static constexpr auto index = Index<Id, std::tuple<T...>>::value;
+    auto&& value = std::get<index>(columns);
+
+    actual_bind(statement, value.value, sizeof...(T));
+  }
+};

src/main.cpp

@@ -6,6 +6,8 @@
 #include <utils/xdg.hpp>
 #include <utils/reload.hpp>
 
+#include <libpq-fe.h>
+
 #ifdef UDNS_FOUND
 # include <network/dns_handler.hpp>
 #endif

src/utils/is_one_of.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <type_traits>
+
+template <typename...>
+struct is_one_of_implem {
+    static constexpr bool value = false;
+};
+
+template <typename F, typename S, typename... T>
+struct is_one_of_implem<F, S, T...> {
+    static constexpr bool value =
+        std::is_same<F, S>::value || is_one_of_implem<F, T...>::value;
+};
+
+template<typename... T>
+constexpr bool is_one_of = is_one_of_implem<T...>::value;

src/utils/optional_bool.cpp

@@ -0,0 +1,8 @@
+#include <utils/optional_bool.hpp>
+
+
+std::ostream& operator<<(std::ostream& os, const OptionalBool& o)
+{
+  os << o.to_string();
+  return os;
+}

src/utils/optional_bool.hpp

@@ -20,7 +20,7 @@ struct OptionalBool
     this->is_set = false;
   }
 
-  std::string to_string()
+  std::string to_string() const
   {
     if (this->is_set == false)
       return "unset";
@@ -33,3 +33,5 @@ struct OptionalBool
   bool is_set{false};
   bool value{false};
 };
+
+std::ostream& operator<<(std::ostream& os, const OptionalBool& o);

tests/database.cpp

@@ -7,13 +7,25 @@
 TEST_CASE("Database")
 {
 #ifdef USE_DATABASE
+//  Database::open("postgresql://test");
   Database::open(":memory:");
+  Database::raw_exec("DELETE FROM " + Database::irc_server_options.get_name());
+  Database::raw_exec("DELETE FROM " + Database::irc_channel_options.get_name());
 
   SECTION("Basic retrieve and update")
     {
       auto o = Database::get_irc_server_options("zouzou@example.com", "irc.example.com");
+      CHECK(Database::count(Database::irc_server_options) == 0);
       o.save(Database::db);
+      CHECK(Database::count(Database::irc_server_options) == 1);
+      o.col<Database::Realname>() = "Different realname";
+      CHECK(o.col<Database::Realname>() == "Different realname");
+      o.save(Database::db);
+      CHECK(o.col<Database::Realname>() == "Different realname");
+      CHECK(Database::count(Database::irc_server_options) == 1);
+
       auto a = Database::get_irc_server_options("zouzou@example.com", "irc.example.com");
+      CHECK(a.col<Database::Realname>() == "Different realname");
       auto b = Database::get_irc_server_options("moumou@example.com", "irc.example.com");
 
       // b does not yet exist in the db, the object is created but not yet
@@ -28,7 +40,6 @@ TEST_CASE("Database")
 
   SECTION("channel options")
     {
-      Config::set("db_name", ":memory:");
       auto o = Database::get_irc_channel_options("zouzou@example.com", "irc.example.com", "#foo");
 
       CHECK(o.col<Database::EncodingIn>() == "");

tests/utils.cpp

@@ -11,6 +11,7 @@
 #include <utils/system.hpp>
 #include <utils/scopeguard.hpp>
 #include <utils/dirname.hpp>
+#include <utils/is_one_of.hpp>
 
 using namespace std::string_literals;
 
@@ -171,3 +172,14 @@ TEST_CASE("dirname")
   CHECK(utils::dirname(".") == ".");
   CHECK(utils::dirname("./") == "./");
 }
+
+TEST_CASE("is_in")
+{
+  CHECK((is_one_of<int, float, std::string, int>) == true);
+  CHECK((is_one_of<int, float, std::string>) == false);
+  CHECK((is_one_of<int>) == false);
+  CHECK((is_one_of<int, int>) == true);
+  CHECK((is_one_of<bool, int>) == false);
+  CHECK((is_one_of<bool, bool>) == true);
+  CHECK((is_one_of<bool, bool, bool, bool, bool, int>) == true);
+}