writing txt file by making query SQLITE database than INSERT query result another column than DELETE it

[kybernetes]

Hello,

I create a SQLITE database like below and add my maillists reading txt files,

db = QSqlDatabase::addDatabase("QSQLITE", "TxtFileDB");
db.setDatabaseName(qApp->applicationDirPath() + "/mails.DB");

i seperated tables for countries (Germany, Switzerland, Spain etc.) and show by tablewidget

i want to create a maillist txt it takes random mails from the tables how many mail i write the tablewidget next column

for example

germany 100
spain 50
switzerland 150

totally 300 mail.

i made this but i need to delete mail from unsent mail column and add to sent column for all tables

please give me an advice because i just tried take mails from databese randomly and write txt file but i thought i have to make a query for all cycle in while(query.next())

maybe there is a way for take my query result paste sent column than delete from unsent column..

so any idea will be accepted.

void MainWindow::on_createMailListBtn_clicked()
{
QDateTime now = QDateTime::currentDateTime();
QString timestamp = now.toString(QLatin1String("yyyyMMdd-hhmmsszzz"));
QString fileName = QString::fromLatin1("mailList_%1.txt").arg(timestamp);
QFile newMailListFile(fileName);
newMailListFile.open(QIODevice::WriteOnly | QIODevice::Text);
QTextStream out(&newMailListFile);

QStringList tables = db.tables();
QSqlQuery query(db);
QString tableName;
QString mailingCount;

for (int i = 0; i < tables.size(); i++)
{
    tableName = ui->mailsTable->item(i,0)->text();
    mailingCount = ui->mailsTable->item(i,1)->text();

    qDebug() << tableName;
    qDebug() << mailingCount;

   query.prepare("SELECT * FROM " + tableName + " ORDER BY RANDOM() LIMIT " + mailingCount );

  if(!query.exec())
 {
      qCritical() << query.lastQuery();
      qCritical() << query.lastError().databaseText();
      qCritical() << query.lastError().driverText();
      return;
  }

   while(query.next())
  {
      //query.value("mail").toString()
      out << query.value("mail").toString() << "\n";
   }

}

newMailListFile.close();

}

[SGaist]

Hi,

You can keep a list of the ids/primary key of the mails you are going to modify and then execute an update query using them.

Hope it helps

[kybernetes]

if i take all ids for an array than can i use all of than in a query to take from unsent table to sent table once?

for example

QList<int> mailsUpdated;
mailsUpdated.clear();

    while(query.next())
    {
        
        out << query.value("mail").toString() << "\n";
        mailsUpdated.append(query.value("id").toInt());
    }

would you please give me an example for what you think about?

Thanks.

[SGaist]

Translate the list in a string of comma separated numbers and use it in the update statement