Hibernate 查询sql结果行数、查询列表的几种方法

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

 查询行数：

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

查询列表：

Criteria criteria = getCriteria();
criteria.add(Restrictions.eq("eventId", eventInformationId));
List<EventTaskAssignment> list = criteria.list();

二、通过原生sql查询

查询行数：

        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;

 查询列表：

1、返回的item为数据库表对应po

        SQLQuery query = getSession().createSQLQuery(sqlQuery);
        query.setParameter("userId", userId);

        query.addEntity(EventTaskAssignment.class);
        List<EventTaskAssignment> items = query.list();

2、返回的item为vo

        SQLQuery query = getSession().createSQLQuery(sqlBuffer.toString());
        query.setParameter("eventInformationId", eventInformationId);
        query.addScalar("userId", StandardBasicTypes.STRING);
        query.addScalar("userName", StandardBasicTypes.STRING);
        query.setResultTransformer(Transformers.aliasToBean(UserRoles.class));
        List<UserRoles> list = query.list();

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();