You cannot set the QSqlDatabase object that QSqlTable model uses outside of the ctor.

I expected to see a method called:

QSqlTableModel::setTable( const QString &tableName, const QSqlDatabase &db );

E.g. like

QSqlQueryModel::setQuery(const QString &qry, const QSqlDatabase &db);

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Suggestion from open source community how to implement this:

qsqltablemodel.h

   public:
      void setDatabase( QSqlDatabase db );

qsqltablemodel.cpp

/*!
   Sets the database connection to the one given.
*/
void QSqlTableModel::setDatabase( QSqlDatabase db )
   {
   Q_D(QSqlTableModel);
   d->db = db.isValid() ? db : QSqlDatabase::database();
   }