How to check whether a database is exist in Qt?

Check whether a PostgreSQL database is exist or not in Qt.

If we try to create a PostgreSQL database through a Qt application, we have to check whether the given database is exist or not. Otherwise an error occurred during database creation.

I have checked the below method in Qt5 and it is working fine. Please replace 'MY_DB_NAME' by your database name.

QSqlQuery DatabaseQuery;
if(DatabaseQuery.prepare("SELECT datname FROM pg_catalog.pg_database WHERE lower(datname) =  lower('MY_DB_NAME')"))
{
     if(DatabaseQuery.exec())
     {
          if(DatabaseQuery.size() == 0)
          {
               //Database not exist
          }
          else
          {
               //Database exist
          }
     }
}