如何動態創建CriteriaQuery

Question

我想創建與此查詢等效的CriteriaQuery： 從用戶u中選擇u，其中u.name =「John」和u.surname =「Black」和u.middlename =「Small」; 但我有「where」謂語的問題。 感謝

Answer 1

您可以使用：

CriteriaBuilder builder = entityManager.getCriteriaBuilder(); 
CriteriaQuery c = ...; 
Root root = ...; 

Predications name = builder.equal(root.get("name"), name); 
Predications surname = ...; 
Predications middlename = ...; 

c.where(name, surname, middlename);