使用預測

如果我們只想檢索幾列，我們可以使用 Projections 類來執行此操作。例如，以下程式碼檢索標題列

 // Selecting all title columns
  List review = session.createCriteria(TravelReview.class)
        .setProjection(Projections.property("title"))
    .list();
  // Getting row count
  review = session.createCriteria(TravelReview.class)
    .setProjection(Projections.rowCount())
    .list();
  // Fetching number of titles
  review = session.createCriteria(TravelReview.class)
    .setProjection(Projections.count("title"))
    .list();