Criteria 查詢條件如果是子對象中的非主鍵字段會報 could not resolve property
1 private Criteria getCriteria(Favorite favorite) { 2 Criteria criteria = importDaoService.favoriteDao.getCriteria(); 3 if (favorite.getStatus() != null) { 4 criteria.add(Restrictions.eq("status", favorite.getStatus())); 5 } 6 Product product = favorite.getProduct(); 7 if (product != null && product.getProductName() != null && !product.getProductName().isEmpty()) { 8 // criteria.createAlias("product", "p"); 9 criteria.add(Restrictions.like("product.id", product.getProductName(), MatchMode.ANYWHERE)); 10 } 11 return criteria; 12 }
以上運行正常。
然而....
1 private Criteria getCriteria(Favorite favorite) { 2 Criteria criteria = importDaoService.favoriteDao.getCriteria(); 3 if (favorite.getStatus() != null) { 4 criteria.add(Restrictions.eq("status", favorite.getStatus())); 5 } 6 Product product = favorite.getProduct(); 7 if (product != null && product.getProductName() != null && !product.getProductName().isEmpty()) { 8 // criteria.createAlias("product", "p"); 9 criteria.add(Restrictions.like("product.productName", product.getProductName(), MatchMode.ANYWHERE)); 10 } 11 return criteria; 12 }
這么寫就會報錯。
最后... ，查了相關資料發現：
如果是非主鍵字段必須要給父對象的字段取別名。
private Criteria getCriteria(Favorite favorite) { Criteria criteria = importDaoService.favoriteDao.getCriteria(); if (favorite.getStatus() != null) { criteria.add(Restrictions.eq("status", favorite.getStatus())); } Product product = favorite.getProduct(); if (product != null && product.getProductName() != null && !product.getProductName().isEmpty()) { criteria.createAlias("product", "p"); criteria.add(Restrictions.like("p.productName", product.getProductName(), MatchMode.ANYWHERE)); } return criteria; }
完美運行！