qsqldatabase

My class DataTable is derived from QAbstractTableModel. It uses a QSqlTableModel object internally to fetch data from a db table. It represents a record for every row in the db (it does more but the record count is always the number of rows in the db table). With MySql, my DataTable::rowCount() implementation just calls rowCount() on the QSqlTableModel, which works nicely. Now with SQLite, Qt's SQLite driver returns a row count of 256 if there are more than 256 rows in the db table, so my DataTable class also returns 256 - which is wrong. The documentation tells me to call while (sql_model-

I wrote a C++ program using Qt. some variables inside my algorithm are changed outside of my program and in a web page. every time the user changes the variable values in the web page I modify a pre-created SQL database. Now I want my code to change the variables value during run time without to stop the code. there is two options : Every n seconds check the database and retrieve the variables value -> this is not good since I have to check if database content is changed every n seconds (it might be without any change for years. Also I don't want to check if the database content is changed)

I have some trouble when I want to add a database. _dataBase = QSqlDatabase::addDatabase("QPSQL"); After calling this method I have an error: QSqlDatabase: QPSQL driver not loaded QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7 I include to PATH variable paths to: PostgreSQL\9.3\bin PostgreSQL\9.3\lib PostgreSQL\9.3\include Also I copy folder sqldrivers to Debug folder. Also tried to copy dlls drom this folder to Debug . Doesn't work either. I came here googling because I had the same problem in Windows. In my case to solve the issue I had to install