Hibernate 查询sql结果行数的几种方法

一、前言

这个东西，难度几乎没有，就是繁琐。

一条简单的select count（*） from table_name

都能有多种书写方式。

总是忘，这里记录下。

一 、通过Criteria 查询

        Criteria criteriaCount = getCriteria();
        criteriaCount = criteriaCount.add(Restrictions.eq("dispatchTaskId", dispatchTaskId));
        criteriaCount.setProjection(Projections.rowCount());
        Integer totalCount = ((Long) criteriaCount.uniqueResult()).intValue();

二、通过原生sql查询

        SQLQuery queryCount = getSession().createSQLQuery("SELECT COUNT(*) FROM incidentInformation  WHERE ii.incidentInformationId = :incidentInformationId AND dti.taskstate = :taskstate");

        queryCount.setParameter("incidentInformationId", incidentInformationId);
        queryCount.setParameter("taskstate", ETaskStatus.STATUS_INIT.getStatusValue());
        int count = ((BigDecimal) queryCount.uniqueResult()).intValue();

        return count;

三、通过hibernate的查询语言查询

        String countHql = "select count(*) from  a  where and a.approveResult = :approveResult and a.approverId = :approverId";
        Query countQuery = getSession().createQuery(countHql);
        countQuery.setParameter("approverId", approverId);
        int count = ((Long) countQuery.uniqueResult()).intValue();