在子句查询中Hibernate条件生成器

Question

如何在Hibernate中为下面给定的查询编写criteria builder api查询？batchId不是主键

从用户中选择批号（'1'，'3'）

我尝试过：

    CriteriaBuilder builder = entityManager.getCriteriaBuilder();
    CriteriaQuery<User> criteriaQuery = builder.createQuery(User.class);
    Root<User> userRoot = criteriaQuery.from(User.class);

    List<Integer> batchIdList = new ArrayList<>();
    batchIdList.add(1);
    batchIdList.add(3);

    Predicate queryPredicate = builder.in(userRoot.get(User_.batchId).in(batchIdList)); 

    criteriaQuery.select(userRoot);
    criteriaQuery.where(queryPredicate);

    TypedQuery<User> userQuery = entityManager.createQuery(criteriaQuery);

    List<User> userResult = userQuery.getResultList();

除了数据库中存在的数据外，我什么也得不到。

Answer 1

Hiberbate 5.3及以上标准查询中IN子句的工作示例。

下面的示例显示员工的姓名（sumit、amit、vivek）和年龄为24岁的数据。

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;


public void getCriteria() {

        Session session = null;
        try {
            session = getSessionfactory().openSession();
            CriteriaBuilder builder = session.getCriteriaBuilder();
            CriteriaQuery<Employee> criteria = builder.createQuery(Employee.class);
            Root<Employee> root = criteria.from(Employee.class);
            List<Predicate> predicates = new ArrayList<Predicate>();
            predicates.add(builder.in(root.get("name")).value("sumit").value("amit").value("vivek"));   // IN clause
            predicates.add(builder.equal(root.get("age"),24));
            criteria.select(root).where(predicates.toArray(new Predicate[] {}));
            List<Employee> employeeList = session.createQuery(criteria).getResultList();
        }
        catch(Exception e) {
            System.out.println(e);
        }

    }

Answer 2

用这个。我假设您的batchId是整数。

 CriteriaBuilder builder = entityManager.getCriteriaBuilder();
        CriteriaQuery<User> criteriaQuery = builder.createQuery(User.class);
        Root<User> userRoot = criteriaQuery.from(User.class);
         criteriaQuery.select(userRoot);    

        List<Integer> batchIdList = new ArrayList<>();
        batchIdList.add(1);
        batchIdList.add(3);
        criteriaQuery            
  .where(builder.and(userRoot.get(User_.batchId).in(batchIdList)));
        TypedQuery<User> userQuery = entityManager.createQuery(criteriaQuery);

        List<User> userResult = userQuery.getResultList();