如何动态创建CriteriaQuery

Question

我想为此查询创建等效的CriteriaQuery： 从用户u中选择u，其中u.name =“John”，u.surname =“Black”，u.middlename =“Small”; 但我对“where”谓词有疑问。 感谢

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);