[SOLVED] QSqlRelationalTableModel and "Lazy population"

[Dronissimo]

Good day everyone .
Could somebody tell me why when I have

@
/Connection.h/

bool connection () {
QSqlDatabase con = QSqlDatabase::addDatabase ("QMYSQL");
con.setHostName("192.168.1.116");
con.setUserName("bacula");
con.setPassword("****");
con.setDatabaseName("test");
if (con.open () ) {
qDebug() << "Connection OK";
}
}@

@
/*MAIN.cpp */
Connection();
QSqlRelationalTableModel * model = new QSqlRelationalTableModel();
model->setTable("MAIN");
model->setRelation(2,QSqlRelation("Prop_Org","Code","OrgName"));
model->setRelation(1,QSqlRelation("Prop_Vid","Code","VidName"));
model->setRelation(5,QSqlRelation("Sources","Code","Name"));
model->select() ;
QTableView * view = new QTableView ();
view->setModel(model);
view->show();@

I DON'T have "lazy population" ,but if i replace Connection.h by Connection_ODBC.h which is using ODBC driver ,

@
/connection_ODBC.h/

bool connection () {
QSqlDatabase mbase = QSqlDatabase::addDatabase("QODBC");
mbase.setDatabaseName("Paradox");
if ( mbase.open() )
qDebug()<< QString ("Paradox connection OK ");
}
@

every works fine .
Is it could happens because in first time i using Mysql and in second Paradox ? ( data in database the same , i make a migration from Paradox to Mysql and trying to have the same behavior)
Maybe I miss something ? Please I need your advice .
thank you for your time and forgive me my English it is not my native .

[Dronissimo]

Ok I resolve it my self , the trick was in my database
"Lazy population" doesn't work if
@QSqlDriver::hasFeature(QSqlDriver::QuerySize)@ return true
Hope this may help somebody .

[gayu]

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