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/*
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 * main-db.cpp
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 * Copyright (C) 2010-2018 Belledonne Communications SARL
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 *
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 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
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 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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 */

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#include <ctime>
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#include "linphone/utils/algorithm.h"
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#include "linphone/utils/utils.h"

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#include "chat/chat-message/chat-message-p.h"
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#include "chat/chat-room/chat-room-p.h"
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#include "chat/chat-room/client-group-chat-room.h"
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#include "chat/chat-room/server-group-chat-room.h"
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#include "conference/participant-p.h"
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#include "content/content-type.h"
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#include "content/content.h"
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#include "core/core-p.h"
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#include "event-log/event-log-p.h"
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#include "event-log/events.h"
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#include "logger/logger.h"
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#include "main-db-key-p.h"
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#include "main-db-p.h"
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#ifdef SOCI_ENABLED
	#include "internal/safe-transaction.h"
	#include "internal/statements.h"
#endif // ifdef SOCI_ENABLED

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// =============================================================================

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// See: http://soci.sourceforge.net/doc/3.2/exchange.html
// Part: Object lifetime and immutability

// -----------------------------------------------------------------------------

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using namespace std;

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LINPHONE_BEGIN_NAMESPACE

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namespace {
	constexpr unsigned int ModuleVersionEvents = makeVersion(1, 0, 1);
	constexpr unsigned int ModuleVersionFriends = makeVersion(1, 0, 0);
	constexpr unsigned int ModuleVersionLegacyFriendsImport = makeVersion(1, 0, 0);
	constexpr unsigned int ModuleVersionLegacyHistoryImport = makeVersion(1, 0, 0);
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	constexpr int LegacyFriendListColId = 0;
	constexpr int LegacyFriendListColName = 1;
	constexpr int LegacyFriendListColRlsUri = 2;
	constexpr int LegacyFriendListColSyncUri = 3;
	constexpr int LegacyFriendListColRevision = 4;

	constexpr int LegacyFriendColFriendListId = 1;
	constexpr int LegacyFriendColSipAddress = 2;
	constexpr int LegacyFriendColSubscribePolicy = 3;
	constexpr int LegacyFriendColSendSubscribe = 4;
	constexpr int LegacyFriendColRefKey = 5;
	constexpr int LegacyFriendColVCard = 6;
	constexpr int LegacyFriendColVCardEtag = 7;
	constexpr int LegacyFriendColVCardSyncUri = 8;
	constexpr int LegacyFriendColPresenceReceived = 9;

	constexpr int LegacyMessageColLocalAddress = 1;
	constexpr int LegacyMessageColRemoteAddress = 2;
	constexpr int LegacyMessageColDirection = 3;
	constexpr int LegacyMessageColText = 4;
	constexpr int LegacyMessageColState = 7;
	constexpr int LegacyMessageColUrl = 8;
	constexpr int LegacyMessageColDate = 9;
	constexpr int LegacyMessageColAppData = 10;
	constexpr int LegacyMessageColContentId = 11;
	constexpr int LegacyMessageColContentType = 13;
	constexpr int LegacyMessageColIsSecured = 14;
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}

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// -----------------------------------------------------------------------------

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MainDb::MainDb (const shared_ptr<Core> &core) : AbstractDb(*new MainDbPrivate), CoreAccessor(core) {}
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#ifdef SOCI_ENABLED

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// -----------------------------------------------------------------------------
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// Soci backend.
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// -----------------------------------------------------------------------------

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template<typename T>
struct EnumToSql {
	T first;
	const char *second;
};

template<typename T>
static constexpr const char *mapEnumToSql (const EnumToSql<T> enumToSql[], size_t n, T key) {
	return n == 0 ? "" : (
		enumToSql[n - 1].first == key ? enumToSql[n - 1].second : mapEnumToSql(enumToSql, n - 1, key)
	);
}
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// Update me event-log-enums values are changed!
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static constexpr EnumToSql<MainDb::Filter> eventFilterToSql[] = {
	{ MainDb::ConferenceCallFilter, "3, 4" },
	{ MainDb::ConferenceChatMessageFilter, "5" },
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	{ MainDb::ConferenceInfoFilter, "1, 2, 6, 7, 8, 9, 10, 11, 12" },
	{ MainDb::ConferenceInfoNoDeviceFilter, "1, 2, 6, 7, 8, 9, 12" }
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};
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static constexpr const char *mapEventFilterToSql (MainDb::Filter filter) {
	return mapEnumToSql(
		eventFilterToSql, sizeof eventFilterToSql / sizeof eventFilterToSql[0], filter
	);
}
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// -----------------------------------------------------------------------------

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static string buildSqlEventFilter (
	const list<MainDb::Filter> &filters,
	MainDb::FilterMask mask,
	const string &condKeyWord = "WHERE"
) {
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	L_ASSERT(findIf(filters, [](const MainDb::Filter &filter) { return filter == MainDb::NoFilter; }) == filters.cend());
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	if (mask == MainDb::NoFilter)
		return "";

	bool isStart = true;
	string sql;
	for (const auto &filter : filters) {
		if (!mask.isSet(filter))
			continue;

		if (isStart) {
			isStart = false;
			sql += " " + condKeyWord + " type IN (";
		} else
			sql += ", ";
		sql += mapEventFilterToSql(filter);
	}

	if (!isStart)
		sql += ") ";

	return sql;
}
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// -----------------------------------------------------------------------------

static inline vector<char> blobToVector (soci::blob &in) {
	size_t len = in.get_len();
	if (!len)
		return vector<char>();
	vector<char> out(len);
	in.read(0, &out[0], len);
	return out;
}

static inline string blobToString (soci::blob &in) {
	vector<char> out = blobToVector(in);
	return string(out.begin(), out.end());
}

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static constexpr string &blobToString (string &in) {
	return in;
}

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// -----------------------------------------------------------------------------
// Statements and helpers.
// -----------------------------------------------------------------------------

class StatementBind {
public:
	StatementBind (soci::statement &stmt) : mStmt(stmt) {}

	~StatementBind () {
		mStmt.bind_clean_up();
	}

	template<typename T>
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	void bind (const T &var) {
		mStmt.exchange(soci::use(var));
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	}

	template<typename T>
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	void bindResult (T &var) {
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		mStmt.exchange(soci::into(var));
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	}

	bool exec () {
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		mStmt.define_and_bind();
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		return mStmt.execute(true);
	}

private:
	soci::statement &mStmt;
};

static inline unique_ptr<soci::statement> makeStatement (soci::session &session, const char *stmt) {
	return makeUnique<soci::statement>(session.prepare << stmt);
}

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struct MainDbPrivate::PreparedStatements {
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	typedef unique_ptr<soci::statement> Statement;

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	Statement select[Statements::SelectCount];
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	Statement insert[Statements::InsertCount];
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};

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void MainDbPrivate::initPreparedStatements () {
	L_Q();

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	soci::session *session = dbSession.getBackendSession();
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	AbstractDb::Backend backend = q->getBackend();
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	preparedStatements = makeUnique<PreparedStatements>();
	for (int i = 0; i < int(Statements::SelectCount); ++i)
		preparedStatements->select[i] = makeStatement(*session, Statements::get(Statements::Select(i), backend));
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	for (int i = 0; i < int(Statements::InsertCount); ++i)
		preparedStatements->insert[i] = makeStatement(*session, Statements::get(Statements::Insert(i), backend));
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}

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// -----------------------------------------------------------------------------

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long long MainDbPrivate::insertSipAddress (const string &sipAddress) {
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	soci::session *session = dbSession.getBackendSession();
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	long long id = selectSipAddressId(sipAddress);
	if (id >= 0)
		return id;
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	lInfo() << "Insert new sip address in database: `" << sipAddress << "`.";
	*session << "INSERT INTO sip_address (value) VALUES (:sipAddress)", soci::use(sipAddress);
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	return dbSession.getLastInsertId();
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}
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void MainDbPrivate::insertContent (long long eventId, const Content &content) {
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	soci::session *session = dbSession.getBackendSession();
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	const long long &contentTypeId = insertContentType(content.getContentType().asString());
	const string &body = content.getBodyAsString();
	*session << "INSERT INTO chat_message_content (event_id, content_type_id, body) VALUES"
		" (:eventId, :contentTypeId, :body)", soci::use(eventId), soci::use(contentTypeId),
		soci::use(body);

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	const long long &chatMessageContentId = dbSession.getLastInsertId();
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	if (content.isFile()) {
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		const FileContent &fileContent = static_cast<const FileContent &>(content);
		const string &name = fileContent.getFileName();
		const size_t &size = fileContent.getFileSize();
		const string &path = fileContent.getFilePath();
		*session << "INSERT INTO chat_message_file_content (chat_message_content_id, name, size, path) VALUES "
			" (:chatMessageContentId, :name, :size, :path)",
			soci::use(chatMessageContentId), soci::use(name), soci::use(size), soci::use(path);
	}

	for (const auto &appData : content.getAppDataMap())
		*session << "INSERT INTO chat_message_content_app_data (chat_message_content_id, name, data) VALUES"
			" (:chatMessageContentId, :name, :data)",
			soci::use(chatMessageContentId), soci::use(appData.first), soci::use(appData.second);
}
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long long MainDbPrivate::insertContentType (const string &contentType) {
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	soci::session *session = dbSession.getBackendSession();
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	long long id;
	*session << "SELECT id FROM content_type WHERE value = :contentType", soci::use(contentType), soci::into(id);
	if (session->got_data())
		return id;
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	lInfo() << "Insert new content type in database: `" << contentType << "`.";
	*session << "INSERT INTO content_type (value) VALUES (:contentType)", soci::use(contentType);
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	return dbSession.getLastInsertId();
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}

long long MainDbPrivate::insertOrUpdateImportedBasicChatRoom (
	long long peerSipAddressId,
	long long localSipAddressId,
	const tm &creationTime
) {
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	soci::session *session = dbSession.getBackendSession();
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	long long id = selectChatRoomId(peerSipAddressId, localSipAddressId);
	if (id >= 0) {
		*session << "UPDATE chat_room SET last_update_time = :lastUpdateTime WHERE id = :id",
			soci::use(creationTime), soci::use(id);
		return id;
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	}

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	static const int capabilities = ChatRoom::CapabilitiesMask(
		{ ChatRoom::Capabilities::Basic, ChatRoom::Capabilities::Migratable }
	);
	lInfo() << "Insert new chat room in database: (peer=" << peerSipAddressId <<
		", local=" << localSipAddressId << ", capabilities=" << capabilities << ").";
	*session << "INSERT INTO chat_room ("
		"  peer_sip_address_id, local_sip_address_id, creation_time, last_update_time, capabilities"
		") VALUES (:peerSipAddressId, :localSipAddressId, :creationTime, :lastUpdateTime, :capabilities)",
		soci::use(peerSipAddressId), soci::use(localSipAddressId), soci::use(creationTime), soci::use(creationTime),
		soci::use(capabilities);
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	return dbSession.getLastInsertId();
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}
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long long MainDbPrivate::insertChatRoom (const shared_ptr<AbstractChatRoom> &chatRoom) {
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	soci::session *session = dbSession.getBackendSession();
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	const ChatRoomId &chatRoomId = chatRoom->getChatRoomId();
	const long long &peerSipAddressId = insertSipAddress(chatRoomId.getPeerAddress().asString());
	const long long &localSipAddressId = insertSipAddress(chatRoomId.getLocalAddress().asString());
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	long long id = selectChatRoomId(peerSipAddressId, localSipAddressId);
	if (id >= 0) {
		lError() << "Unable to insert chat room (it already exists): (peer=" << peerSipAddressId <<
			", local=" << localSipAddressId << ").";
		return id;
	}
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	lInfo() << "Insert new chat room in database: (peer=" << peerSipAddressId <<
		", local=" << localSipAddressId << ").";
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	const tm &creationTime = Utils::getTimeTAsTm(chatRoom->getCreationTime());
	// Remove capabilities like `Proxy`.
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	const int &capabilities = chatRoom->getCapabilities() & ~ChatRoom::CapabilitiesMask(ChatRoom::Capabilities::Proxy);
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	const string &subject = chatRoom->getSubject();
	const int &flags = chatRoom->hasBeenLeft();
	*session << "INSERT INTO chat_room ("
		"  peer_sip_address_id, local_sip_address_id, creation_time, last_update_time, capabilities, subject, flags"
		") VALUES (:peerSipAddressId, :localSipAddressId, :creationTime, :lastUpdateTime, :capabilities, :subject, :flags)",
		soci::use(peerSipAddressId), soci::use(localSipAddressId), soci::use(creationTime), soci::use(creationTime),
		soci::use(capabilities), soci::use(subject), soci::use(flags);
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	id = dbSession.getLastInsertId();
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	if (!chatRoom->canHandleParticipants())
		return id;
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	// Do not add 'me' when creating a server-group-chat-room.
	if (chatRoomId.getLocalAddress() != chatRoomId.getPeerAddress()) {
		shared_ptr<Participant> me = chatRoom->getMe();
		long long meId = insertChatRoomParticipant(
			id,
			insertSipAddress(me->getAddress().asString()),
			me->isAdmin()
		);
		for (const auto &device : me->getPrivate()->getDevices())
			insertChatRoomParticipantDevice(meId, insertSipAddress(device->getAddress().asString()));
	}
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	for (const auto &participant : chatRoom->getParticipants()) {
		long long participantId = insertChatRoomParticipant(
			id,
			insertSipAddress(participant->getAddress().asString()),
			participant->isAdmin()
		);
		for (const auto &device : participant->getPrivate()->getDevices())
			insertChatRoomParticipantDevice(participantId, insertSipAddress(device->getAddress().asString()));
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	}

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	return id;
}
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long long MainDbPrivate::insertChatRoomParticipant (
	long long chatRoomId,
	long long participantSipAddressId,
	bool isAdmin
) {
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	soci::session *session = dbSession.getBackendSession();
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	long long id = selectChatRoomParticipantId(chatRoomId, participantSipAddressId);
	if (id >= 0) {
		// See: https://stackoverflow.com/a/15299655 (cast to reference)
		*session << "UPDATE chat_room_participant SET is_admin = :isAdmin WHERE id = :id",
			soci::use(static_cast<const int &>(isAdmin)), soci::use(id);
		return id;
	}
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	lInfo() << "Insert new chat room participant in database: `" << participantSipAddressId <<
		"` (isAdmin=" << isAdmin << ").";
	*session << "INSERT INTO chat_room_participant (chat_room_id, participant_sip_address_id, is_admin)"
		" VALUES (:chatRoomId, :participantSipAddressId, :isAdmin)",
		soci::use(chatRoomId), soci::use(participantSipAddressId), soci::use(static_cast<const int &>(isAdmin));
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	return dbSession.getLastInsertId();
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}
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void MainDbPrivate::insertChatRoomParticipantDevice (
	long long participantId,
	long long participantDeviceSipAddressId
) {
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	soci::session *session = dbSession.getBackendSession();
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	long long count;
	*session << "SELECT COUNT(*) FROM chat_room_participant_device"
		" WHERE chat_room_participant_id = :participantId"
		" AND participant_device_sip_address_id = :participantDeviceSipAddressId",
		soci::into(count), soci::use(participantId), soci::use(participantDeviceSipAddressId);
	if (count)
		return;

	lInfo() << "Insert new chat room participant device in database: `" << participantDeviceSipAddressId << "`.";
	*session << "INSERT INTO chat_room_participant_device (chat_room_participant_id, participant_device_sip_address_id)"
		" VALUES (:participantId, :participantDeviceSipAddressId)",
		soci::use(participantId), soci::use(participantDeviceSipAddressId);
}
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void MainDbPrivate::insertChatMessageParticipant (long long eventId, long long sipAddressId, int state) {
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	if (state != static_cast<int>(ChatMessage::State::Displayed)) {
		soci::session *session = dbSession.getBackendSession();
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		*session << "INSERT INTO chat_message_participant (event_id, participant_sip_address_id, state)"
			" VALUES (:eventId, :sipAddressId, :state)",
			soci::use(eventId), soci::use(sipAddressId), soci::use(state);
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	}
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}
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// -----------------------------------------------------------------------------

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long long MainDbPrivate::selectSipAddressId (const string &sipAddress) const {
	long long id;
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	StatementBind stmt(*preparedStatements->select[Statements::SelectSipAddressId]);
	stmt.bind(sipAddress);
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	stmt.bindResult(id);

	return stmt.exec() ? id : -1;
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}
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long long MainDbPrivate::selectChatRoomId (long long peerSipAddressId, long long localSipAddressId) const {
	long long id;
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	StatementBind stmt(*preparedStatements->select[Statements::SelectChatRoomId]);
	stmt.bind(peerSipAddressId);
	stmt.bind(localSipAddressId);
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	stmt.bindResult(id);

	return stmt.exec() ? id : -1;
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}
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long long MainDbPrivate::selectChatRoomId (const ChatRoomId &chatRoomId) const {
	long long peerSipAddressId = selectSipAddressId(chatRoomId.getPeerAddress().asString());
	if (peerSipAddressId < 0)
		return -1;
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	long long localSipAddressId = selectSipAddressId(chatRoomId.getLocalAddress().asString());
	if (localSipAddressId < 0)
		return -1;
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	return selectChatRoomId(peerSipAddressId, localSipAddressId);
}
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long long MainDbPrivate::selectChatRoomParticipantId (long long chatRoomId, long long participantSipAddressId) const {
	long long id;
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	StatementBind stmt(*preparedStatements->select[Statements::SelectChatRoomParticipantId]);
	stmt.bind(chatRoomId);
	stmt.bind(participantSipAddressId);
	stmt.bindResult(id);

	return stmt.exec() ? id : -1;
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}
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long long MainDbPrivate::selectOneToOneChatRoomId (long long sipAddressIdA, long long sipAddressIdB) const {
	long long id;
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	StatementBind stmt(*preparedStatements->select[Statements::SelectOneToOneChatRoomId]);
	stmt.bind(sipAddressIdA);
	stmt.bind(sipAddressIdB);
	stmt.bind(sipAddressIdA);
	stmt.bind(sipAddressIdB);
	stmt.bindResult(id);

	return stmt.exec() ? id : -1;
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}

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// -----------------------------------------------------------------------------

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void MainDbPrivate::deleteContents (long long messageEventId) {
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	soci::session *session = dbSession.getBackendSession();
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	*session << "DELETE FROM chat_message_content WHERE event_id = :messageEventId", soci::use(messageEventId);
}
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void MainDbPrivate::deleteChatRoomParticipant (long long chatRoomId, long long participantSipAddressId) {
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	soci::session *session = dbSession.getBackendSession();
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	*session << "DELETE FROM chat_room_participant"
		"  WHERE chat_room_id = :chatRoomId AND participant_sip_address_id = :participantSipAddressId",
		soci::use(chatRoomId), soci::use(participantSipAddressId);
}
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void MainDbPrivate::deleteChatRoomParticipantDevice (
	long long participantId,
	long long participantDeviceSipAddressId
) {
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	soci::session *session = dbSession.getBackendSession();
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	*session << "DELETE FROM chat_room_participant_device"
		"  WHERE chat_room_participant_id = :participantId"
		"  AND participant_device_sip_address_id = :participantDeviceSipAddressId",
		soci::use(participantId), soci::use(participantDeviceSipAddressId);
}
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// -----------------------------------------------------------------------------

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shared_ptr<EventLog> MainDbPrivate::selectGenericConferenceEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	shared_ptr<EventLog> eventLog;

	switch (type) {
		case EventLog::Type::None:
			return nullptr;
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		case EventLog::Type::ConferenceCreated:
		case EventLog::Type::ConferenceTerminated:
			eventLog = selectConferenceEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceCallStart:
		case EventLog::Type::ConferenceCallEnd:
			eventLog = selectConferenceCallEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceChatMessage:
			eventLog = selectConferenceChatMessageEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceParticipantAdded:
		case EventLog::Type::ConferenceParticipantRemoved:
		case EventLog::Type::ConferenceParticipantSetAdmin:
		case EventLog::Type::ConferenceParticipantUnsetAdmin:
			eventLog = selectConferenceParticipantEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceParticipantDeviceAdded:
		case EventLog::Type::ConferenceParticipantDeviceRemoved:
			eventLog = selectConferenceParticipantDeviceEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceSubjectChanged:
			eventLog = selectConferenceSubjectEvent(eventId, type, creationTime, chatRoomId);
			break;
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	}

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	if (eventLog)
		cache(eventLog, eventId);
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	return eventLog;
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceEvent (
	long long,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	return make_shared<ConferenceEvent>(
		type,
		creationTime,
		chatRoomId
	);
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceCallEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	// TODO.
	return nullptr;
}
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template<typename T>
static void fetchContentAppData (soci::session *session, Content &content, long long contentId, T &data) {
	static const string query = "SELECT name, data FROM chat_message_content_app_data"
		" WHERE chat_message_content_id = :contentId";
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	string name;
	soci::statement statement = (session->prepare << query, soci::use(contentId), soci::into(name), soci::into(data));
	statement.execute();
	while (statement.fetch())
		content.setAppData(name, blobToString(data));
}

shared_ptr<EventLog> MainDbPrivate::selectConferenceChatMessageEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	L_Q();

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	shared_ptr<Core> core = q->getCore();
	shared_ptr<AbstractChatRoom> chatRoom = core->findChatRoom(chatRoomId);
	if (!chatRoom) {
		lError() << "Unable to find chat room storage id of (peer=" +
			chatRoomId.getPeerAddress().asString() +
			", local=" + chatRoomId.getLocalAddress().asString() + "`).";
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		return nullptr;
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	}

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	shared_ptr<ChatMessage> chatMessage = getChatMessageFromCache(eventId);
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	if (!chatMessage) {
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		string fromSipAddress;
		string toSipAddress;
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		tm messageTime;

		string imdnMessageId;
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		int state;
		int direction;
		int isSecured;
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		soci::session *session = dbSession.getBackendSession();
		*session << "SELECT from_sip_address.value, to_sip_address.value, time, imdn_message_id, state, direction, is_secured"
			" FROM event, conference_chat_message_event, sip_address AS from_sip_address, sip_address AS to_sip_address"
			" WHERE event_id = :eventId"
			" AND event_id = event.id"
			" AND from_sip_address_id = from_sip_address.id"
			" AND to_sip_address_id = to_sip_address.id", soci::into(fromSipAddress), soci::into(toSipAddress),
			soci::into(messageTime), soci::into(imdnMessageId), soci::into(state), soci::into(direction),
			soci::into(isSecured), soci::use(eventId);
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		return selectConferenceChatMessageEvent (
			eventId,
			type,
			creationTime,
			chatRoom,
			fromSipAddress,
			toSipAddress,
			messageTime,
			imdnMessageId,
			state,
			direction,
			isSecured
		);
	}

	return make_shared<ConferenceChatMessageEvent>(
		creationTime,
		chatMessage
	);
}

shared_ptr<EventLog> MainDbPrivate::selectConferenceChatMessageEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	shared_ptr<AbstractChatRoom> &chatRoom,
	const string &fromSipAddress,
	const string &toSipAddress,
	const tm &messageTime,
	const string &imdnMessageId,
	int state,
	int direction,
	int isSecured
) const {
	shared_ptr<ChatMessage> chatMessage = getChatMessageFromCache(eventId);
	if (!chatMessage) {
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		chatMessage = shared_ptr<ChatMessage>(new ChatMessage(
			chatRoom,
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			ChatMessage::Direction(direction)
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		));
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		chatMessage->setIsSecured(bool(isSecured));
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		ChatMessagePrivate *dChatMessage = chatMessage->getPrivate();
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		dChatMessage->setState(ChatMessage::State(state), true);
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		dChatMessage->forceFromAddress(IdentityAddress(fromSipAddress));
		dChatMessage->forceToAddress(IdentityAddress(toSipAddress));
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		dChatMessage->setTime(Utils::getTmAsTimeT(messageTime));
		dChatMessage->setImdnMessageId(imdnMessageId);

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		dChatMessage->markContentsAsNotLoaded();
		dChatMessage->setIsReadOnly(true);
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		cache(chatMessage, eventId);
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	}

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	return make_shared<ConferenceChatMessageEvent>(
		creationTime,
		chatMessage
	);
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceParticipantEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	unsigned int notifyId;
	string participantAddress;

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	soci::session *session = dbSession.getBackendSession();
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	*session << "SELECT notify_id, participant_address.value"
		"  FROM conference_notified_event, conference_participant_event, sip_address as participant_address"
		"  WHERE conference_participant_event.event_id = :eventId"
		"    AND conference_notified_event.event_id = conference_participant_event.event_id"
		"    AND participant_address.id = participant_sip_address_id",
		soci::into(notifyId), soci::into(participantAddress), soci::use(eventId);

	return make_shared<ConferenceParticipantEvent>(
		type,
		creationTime,
		chatRoomId,
		notifyId,
		IdentityAddress(participantAddress)
	);
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceParticipantDeviceEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	unsigned int notifyId;
	string participantAddress;
	string deviceAddress;

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	soci::session *session = dbSession.getBackendSession();
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	*session << "SELECT notify_id, participant_address.value, device_address.value"
		"  FROM conference_notified_event, conference_participant_event, conference_participant_device_event,"
		"    sip_address AS participant_address, sip_address AS device_address"
		"  WHERE conference_participant_device_event.event_id = :eventId"
		"    AND conference_participant_event.event_id = conference_participant_device_event.event_id"
		"    AND conference_notified_event.event_id = conference_participant_event.event_id"
		"    AND participant_address.id = participant_sip_address_id"
		"    AND device_address.id = device_sip_address_id",
		soci::into(notifyId), soci::into(participantAddress), soci::into(deviceAddress), soci::use(eventId);

	return make_shared<ConferenceParticipantDeviceEvent>(
		type,
		creationTime,
		chatRoomId,
		notifyId,
		IdentityAddress(participantAddress),
		IdentityAddress(deviceAddress)
	);
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceSubjectEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	unsigned int notifyId;
	string subject;

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	soci::session *session = dbSession.getBackendSession();
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	*session << "SELECT notify_id, subject"
		" FROM conference_notified_event, conference_subject_event"
		" WHERE conference_subject_event.event_id = :eventId"
		" AND conference_notified_event.event_id = conference_subject_event.event_id",
		soci::into(notifyId), soci::into(subject), soci::use(eventId);

	return make_shared<ConferenceSubjectEvent>(
		creationTime,
		chatRoomId,
		notifyId,
		subject
	);
}
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// -----------------------------------------------------------------------------
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long long MainDbPrivate::insertEvent (const shared_ptr<EventLog> &eventLog) {
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	soci::session *session = dbSession.getBackendSession();
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	const int &type = int(eventLog->getType());
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	const tm &creationTime = Utils::getTimeTAsTm(eventLog->getCreationTime());
	*session << "INSERT INTO event (type, creation_time) VALUES (:type, :creationTime)",
		soci::use(type),
		soci::use(creationTime);

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	return dbSession.getLastInsertId();
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}
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long long MainDbPrivate::insertConferenceEvent (const shared_ptr<EventLog> &eventLog, long long *chatRoomId) {
	shared_ptr<ConferenceEvent> conferenceEvent = static_pointer_cast<ConferenceEvent>(eventLog);

	long long eventId = -1;
	const long long &curChatRoomId = selectChatRoomId(conferenceEvent->getChatRoomId());
	if (curChatRoomId < 0) {
		// A conference event can be inserted in database only if chat room exists.
		// Otherwise it's an error.
		const ChatRoomId &chatRoomId = conferenceEvent->getChatRoomId();
		lError() << "Unable to find chat room storage id of (peer=" +
			chatRoomId.getPeerAddress().asString() +
			", local=" + chatRoomId.getLocalAddress().asString() + "`).";
	} else {
		eventId = insertEvent(eventLog);
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		soci::session *session = dbSession.getBackendSession();
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		*session << "INSERT INTO conference_event (event_id, chat_room_id)"
			" VALUES (:eventId, :chatRoomId)", soci::use(eventId), soci::use(curChatRoomId);

		const tm &lastUpdateTime = Utils::getTimeTAsTm(eventLog->getCreationTime());
		*session << "UPDATE chat_room SET last_update_time = :lastUpdateTime"
			" WHERE id = :chatRoomId", soci::use(lastUpdateTime),
			soci::use(curChatRoomId);
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		if (eventLog->getType() == EventLog::Type::ConferenceTerminated)
			*session << "UPDATE chat_room SET flags = 1 WHERE id = :chatRoomId", soci::use(curChatRoomId);
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	}

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	if (chatRoomId)
		*chatRoomId = curChatRoomId;

	return eventId;
}
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long long MainDbPrivate::insertConferenceCallEvent (const shared_ptr<EventLog> &eventLog) {
	// TODO.
	return 0;
}
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long long MainDbPrivate::insertConferenceChatMessageEvent (const shared_ptr<EventLog> &eventLog) {
	shared_ptr<ChatMessage> chatMessage = static_pointer_cast<ConferenceChatMessageEvent>(eventLog)->getChatMessage();
	shared_ptr<AbstractChatRoom> chatRoom = chatMessage->getChatRoom();
	if (!chatRoom) {
		lError() << "Unable to get a valid chat room. It was removed from database.";
		return -1;
	}

	const long long &eventId = insertConferenceEvent(eventLog);
	if (eventId < 0)
		return -1;

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	soci::session *session = dbSession.getBackendSession();
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	const long long &fromSipAddressId = insertSipAddress(chatMessage->getFromAddress().asString());
	const long long &toSipAddressId = insertSipAddress(chatMessage->getToAddress().asString());
	const tm &messageTime = Utils::getTimeTAsTm(chatMessage->getTime());
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	const int &state = int(chatMessage->getState());
	const int &direction = int(chatMessage->getDirection());
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	const string &imdnMessageId = chatMessage->getImdnMessageId();
	const int &isSecured = chatMessage->isSecured() ? 1 : 0;

	*session << "INSERT INTO conference_chat_message_event ("
		"  event_id, from_sip_address_id, to_sip_address_id,"
		"  time, state, direction, imdn_message_id, is_secured"
		") VALUES ("
		"  :eventId, :localSipaddressId, :remoteSipaddressId,"
		"  :time, :state, :direction, :imdnMessageId, :isSecured"
		")", soci::use(eventId), soci::use(fromSipAddressId), soci::use(toSipAddressId),
		soci::use(messageTime), soci::use(state), soci::use(direction),
		soci::use(imdnMessageId), soci::use(isSecured);

	for (const Content *content : chatMessage->getContents())
		insertContent(eventId, *content);

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	for (const auto &participant : chatRoom->getParticipants()) {
		const long long &participantSipAddressId = selectSipAddressId(participant->getAddress().asString());
		insertChatMessageParticipant(eventId, participantSipAddressId, state);
	}

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	return eventId;
}

void MainDbPrivate::updateConferenceChatMessageEvent (const shared_ptr<EventLog> &eventLog) {
	shared_ptr<ChatMessage> chatMessage = static_pointer_cast<ConferenceChatMessageEvent>(eventLog)->getChatMessage();
	shared_ptr<AbstractChatRoom> chatRoom = chatMessage->getChatRoom();
	if (!chatRoom) {
		lError() << "Unable to get a valid chat room. It was removed from database.";
		return;
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	}

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	const EventLogPrivate *dEventLog = eventLog->getPrivate();
	MainDbKeyPrivate *dEventKey = static_cast<MainDbKey &>(dEventLog->dbKey).getPrivate();
	const long long &eventId = dEventKey->storageId;
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	soci::session *session = dbSession.getBackendSession();
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	const int &state = int(chatMessage->getState());
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	const string &imdnMessageId = chatMessage->getImdnMessageId();
	*session << "UPDATE conference_chat_message_event SET state = :state, imdn_message_id = :imdnMessageId"
		" WHERE event_id = :eventId",
		soci::use(state), soci::use(imdnMessageId), soci::use(eventId);
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	deleteContents(eventId);
	for (const auto &content : chatMessage->getContents())
		insertContent(eventId, *content);
}
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long long MainDbPrivate::insertConferenceNotifiedEvent (const shared_ptr<EventLog> &eventLog, long long *chatRoomId) {
	long long curChatRoomId;
	const long long &eventId = insertConferenceEvent(eventLog, &curChatRoomId);
	if (eventId < 0)
		return -1;
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	const unsigned int &lastNotifyId = static_pointer_cast<ConferenceNotifiedEvent>(eventLog)->getNotifyId();
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	soci::session *session = dbSession.getBackendSession();
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	*session << "INSERT INTO conference_notified_event (event_id, notify_id)"
		" VALUES (:eventId, :notifyId)", soci::use(eventId), soci::use(lastNotifyId);
	*session << "UPDATE chat_room SET last_notify_id = :lastNotifyId WHERE id = :chatRoomId",
		soci::use(lastNotifyId), soci::use(curChatRoomId);
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	if (chatRoomId)
		*chatRoomId = curChatRoomId;
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	return eventId;
}
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long long MainDbPrivate::insertConferenceParticipantEvent (
	const shared_ptr<EventLog> &eventLog,
	long long *chatRoomId
) {
	long long curChatRoomId;
	const long long &eventId = insertConferenceNotifiedEvent(eventLog, &curChatRoomId);
	if (eventId < 0)
		return -1;
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	shared_ptr<ConferenceParticipantEvent> participantEvent =
		static_pointer_cast<ConferenceParticipantEvent>(eventLog);
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	const long long &participantAddressId = insertSipAddress(
		participantEvent->getParticipantAddress().asString()
	);

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	soci::session *session = dbSession.getBackendSession();
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	*session << "INSERT INTO conference_participant_event (event_id, participant_sip_address_id)"
		"  VALUES (:eventId, :participantAddressId)", soci::use(eventId), soci::use(participantAddressId);

	bool isAdmin = eventLog->getType() == EventLog::Type::ConferenceParticipantSetAdmin;
	switch (eventLog->getType()) {
		case EventLog::Type::ConferenceParticipantAdded:
		case EventLog::Type::ConferenceParticipantSetAdmin:
		case EventLog::Type::ConferenceParticipantUnsetAdmin:
			insertChatRoomParticipant(curChatRoomId, participantAddressId, isAdmin);
			break;

		case EventLog::Type::ConferenceParticipantRemoved:
			deleteChatRoomParticipant(curChatRoomId, participantAddressId);
			break;

		default:
			break;
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	}

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	if (chatRoomId)
		*chatRoomId = curChatRoomId;
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	return eventId;
}
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long long MainDbPrivate::insertConferenceParticipantDeviceEvent (const shared_ptr<EventLog> &eventLog) {
	long long chatRoomId;
	const long long &eventId = insertConferenceParticipantEvent(eventLog, &chatRoomId);
	if (eventId < 0)
		return -1;
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	shared_ptr<ConferenceParticipantDeviceEvent> participantDeviceEvent =
		static_pointer_cast<ConferenceParticipantDeviceEvent>(eventLog);
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	const string participantAddress = participantDeviceEvent->getParticipantAddress().asString();
	const long long &participantAddressId = selectSipAddressId(participantAddress);
	if (participantAddressId < 0) {
		lError() << "Unable to find sip address id of: `" << participantAddress << "`.";
		return -1;
	}
	const long long &participantId = selectChatRoomParticipantId(chatRoomId, participantAddressId);
	if (participantId < 0) {
		lError() << "Unable to find valid participant id in database with chat room id = " << chatRoomId <<
		" and participant address id = " << participantId;
		return -1;
	}
	const long long &deviceAddressId = insertSipAddress(
		participantDeviceEvent->getDeviceAddress().asString()
	);
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	soci::session *session = dbSession.getBackendSession();
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	*session << "INSERT INTO conference_participant_device_event (event_id, device_sip_address_id)"
		" VALUES (:eventId, :deviceAddressId)", soci::use(eventId), soci::use(deviceAddressId);
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