使用qt从sqlite数据库获取数据

Question

I want to get data from sqlite database, i use this code it's work only for small row but when try something big like 300000 its not working the code:

  QString serVal = "searchItem";
        QSqlQuery qry;

            qry.exec("select * from myTable");

            while (qry.next()) { 
                 if(serVal == qry.value("myCol1").toString())
                 {
                     qDebug () << qry.value("myCol2").toString();
                     qDebug () << qry.value("myCol5").toString();
                     qDebug () << qry.value("myCol8").toString();
                     break;

                 }
            }

Answer 1

Use QSqlQueryModel instead of QSqlQuery like this:

QSqlQueryModel queryModel;
queryModel->setQuery("select * from myTable");

while (queryModel.canFetchMore())
            queryModel.fetchMore();

for (int i = 0; i < queryModel.rowCount(); i++)
{
 // Your data
}