QT database connection

qt Database connection

QSqlDatabase： You can provide a default connection for Qt Other SQL Class uses .
QSqlQuery class , Provides direct execution of arbitrary SQL Statement and process the method that returns the result .

Database connection be used QSqlDatabase And in its classes :: database and addDatabase,
QString g_sThreadId;
QSqlDatabase db = QSqlDatabase::database(g_sThreadId);
if (! db.isValid()) {
// Parameters 1 Is the driver name , Parameters 2 Name connection name and database The parameters in are the same , Or there is no connection name
db = QSqlDatabase::addDatabase(sDriver, g_sThreadId);
db.setDatabaseName(sDBName);
db.setUserName(sUserName);
db.setPassword(sPassword);
db.setHostName(sServerName);
db.open(); // Create a connection to the database
}