Question

我正在尝试使用Hibernate实现他的Java代码以进行SQL查询：

public List<AttendeeModel> getListOfCds(int firstRow, int rowCount) {
        List<AttendeeModel> cdList = null;
        try {
            session.beginTransaction();
            Criteria criteria = session.createCriteria(AttendeeModel.class);
            criteria.setFirstResult(firstRow);
            criteria.setMaxResults(rowCount);
            if (criteria != null) {
                cdList = (List<AttendeeModel>) criteria.list();
            }
            session.getTransaction().commit();
        } catch (Exception e) {
            e.printStackTrace();
            session.getTransaction().rollback();
        }
        return cdList;
    }

    public int countRows() {
        try {
            session.beginTransaction();
            Criteria criteria = session.createCriteria(AttendeeModel.class);
            if (criteria != null) {
                return criteria.list().size();
            }
            session.getTransaction().commit();
        } catch (Exception e) {
            e.printStackTrace();
            session.getTransaction().rollback();
        }
        return 0;
    }

但是由于某些原因，我会收到此错误：

 java.lang.IllegalStateException: Session/EntityManager is closed

您知道如何解决此问题吗？

Answer 1

从您的代码中，尚不清楚session在何处被清除以及如何填充。鉴于此操作已正确完成，我怀疑在countRow返回之前缺少事务提交/回滚会导致异常，请尝试：

public int countRows() {
    int size = 0;
    try {
        session.beginTransaction();
        Criteria criteria = session.createCriteria(AttendeeModel.class);
        if (criteria != null) {
            size = criteria.list().size();
        }
        session.getTransaction().commit();
    } catch (Exception e) {
        e.printStackTrace();
        session.getTransaction().rollback();
    }
    return size;
}

IllegalStateException：会话/实体管理器已关闭

1 个答案: