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/*
Copyright (C) 2019-2024 Selwin van Dijk
This file is part of signalbackup-tools.
signalbackup-tools 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 3 of the License, or
(at your option) any later version.
signalbackup-tools 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
along with signalbackup-tools. If not, see <https://www.gnu.org/licenses/>.
*/
#include "signalbackup.ih"
void SignalBackup::setMinimumId(std::string const &table, long long int offset, std::string const &col) const
{
Logger::message(__FUNCTION__, " ", table);
if (offset == 0) // no changes requested
return;
// change sign on all values:
d_database.exec("UPDATE " + table + " SET " + col + " = " + col + " * -1");
// change sign back && apply offset
d_database.exec("UPDATE " + table + " SET " + col + " = " + col + " * -1 + ?", offset);
/*
// OLD VERSION
// move everything to max + offset, the subtract max again. This works, but only if the id's are handled in order.
if (offset < 0)
{
d_database.exec("UPDATE " + table + " SET " + col + " = " + col + " + (SELECT MAX(" + col + ") from " + table + ") - (SELECT MIN(" + col + ") from " + table + ") + ?", 1ll);
d_database.exec("UPDATE " + table + " SET " + col + " = " + col + " - (SELECT MAX(" + col + ") from " + table + ") + (SELECT MIN(" + col + ") from " + table + ") + ?", (offset - 1));
}
else
{
d_database.exec("UPDATE " + table + " SET " + col + " = " + col + " + (SELECT MAX(" + col + ") from " + table + ") - (SELECT MIN(" + col + ") from " + table + ") + ?", offset);
d_database.exec("UPDATE " + table + " SET " + col + " = " + col + " - (SELECT MAX(" + col + ") from " + table + ") + (SELECT MIN(" + col + ") from " + table + ")");
}
*/
}
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