How to connect Serwer application and Client Application

[coutKateM]

I have Serwer application connected to a database like that:

Database::Database(QObject *parent) : QObject(parent)
{
db = QSqlDatabase::addDatabase("QPSQL");
db.setHostName("localhost");
db.setDatabaseName("main");
db.setUserName("postgres");
db.setPort(5432);
db.setPassword("zalfon19");
if(!db.open()){
auto problemDialog = new InfoDialog(InfoDialog::Warning, "Baza danych", "Aplikacja napotkała na problem z połączeniem z bazą danych", nullptr, true);
problemDialog->show();
qDebug()<<"There is a problem with database.";
return;
}
qDebug()<<"There is no problem with database.";

QSqlQuery querry;
querry.exec("truncate active_errors");

}

The client application, without necessary changes, just for explanation my situation :

Database::Database(QObject *parent) : QObject(parent)
{
db = QSqlDatabase::addDatabase("QPSQL");
db.setHostName(settings.dbpath.get());
db.setDatabaseName("main");
db.setUserName("postgres");
db.setPort(5432);
db.setPassword("zalfon19");
if(!db.open()){
auto problemDialog = new InfoDialog(InfoDialog::Warning, "Baza danych", "Aplikacja napotkała na problem z połączeniem z bazą danych", nullptr, true);
problemDialog->show();
qDebug()<<"There is a problem with database.";
}
qDebug()<<"There is no problem with database.";

}

[JonB]

@coutKateM

• You do not say what error you get, if any. We are not mind-readers.

• For all we know, maybe the path is wrong, or the database name, or the credentials. When a QSqlDatabase operation fails there is QSqlDatabase::lastError(), which you should obviously be accessing.

• You seem to have a member variable of db. As the docs state, you should not have any member variable of type QSqlDatabase around.

• You talk about "server" & "client". Yet they both access the database directly. No idea what you mean by "server/client" here.