code: func (m *DbMap) Exec(query string, args ...interface{}) (sql.Result, error) {
  	m.trace(query, args)
  	//stmt, err := m.Db.Prepare(query)
  	//if err != nil {
  	//	return nil, err
  	//}
  	//fmt.Println("Exec", query, args)
  	return m.Db.Exec(query, args...)
  }
docs: // Exec runs an arbitrary SQL statement.  args represent the bind parameters.
  // This is equivalent to running Exec() using database/sql.