code: func (t *Transaction) Prepare(query string) (*sql.Stmt, error) {
  	if t.dbmap.logger != nil {
  		now := time.Now()
  		defer t.dbmap.trace(now, query, nil)
  	}
  	return prepare(t, query)
  }
docs: // Prepare has the same behavior as DbMap.Prepare(), but runs in a transaction.