Java sql到hql引发异常
我在项目中使用hibernate,并试图将现有sql查询从DAO实现类转换为hql 我的sql查询是Java sql到hql引发异常,java,hibernate,hql,Java,Hibernate,Hql,我在项目中使用hibernate,并试图将现有sql查询从DAO实现类转换为hql 我的sql查询是 JdbcTemplate select = new JdbcTemplate(dataSource); String sql = "SELECT * FROM (SELECT site_id,rtc,sigplan,cycle_time,health,phase_no,phase_time,active_groups,groupscolour,ip "+
JdbcTemplate select = new JdbcTemplate(dataSource);
String sql = "SELECT * FROM (SELECT site_id,rtc,sigplan,cycle_time,health,phase_no,phase_time,active_groups,groupscolour,ip "+
"FROM status_data where rtc>='" + fromDate + "' and rtc<'" + toDate + "' and "+
"site_id=" + SiteId + " order by rtc desc limit "+recordLimit+" )as temp ORDER BY RTC ASC";
实现结果的正确方法是什么?首先,如注释中所述,您不能在HQL中的FROM子句中执行子查询。 见: 其次,HQL不支持limit关键字。 通常您会使用
query.setFirstResult(0)
和query.setMaxResults(recordLimit)
方法,其中query具有查询接口的类型。但是,因为您在子查询中使用了限制,所以没有办法。
见:
一些选择:
Session session = factory.openSession();
Query query = session
.createQuery("FROM HealthLog "
+ "WHERE rtc >= :rtcL and rtc < :rtcG and siteId = :siteId "
+ "ORDER BY rtc DESC");
query.setParameter("rtcL", fromDate);
query.setParameter("rtcG", toDate);
query.setParameter("siteId", siteId);
query.setFirstResult(0);
query.setMaxResults(recordLimit);
List<HealthLog> res = query.list();
session.close();
Collections.sort(res, new Comparator<HealthLog>() {
public int compare(HealthLog o1, HealthLog o2) {
return o1.getRtc().compareTo(o2.getRtc());
}
});
Session Session=factory.openSession();
查询=会话
.createQuery(“来自HealthLog”
+“其中rtc>=:rtcL和rtc<:rtcG和siteId=:siteId”
+“rtc DESC指令”);
query.setParameter(“rtcL”,fromDate);
query.setParameter(“rtcG”,toDate);
query.setParameter(“siteId”,siteId);
query.setFirstResult(0);
query.setMaxResults(记录限制);
List res=query.List();
session.close();
Collections.sort(res,newcomparator(){
公共整数比较(HealthLog o1、HealthLog o2){
返回o1.getRtc().compareTo(o2.getRtc());
}
});
上面的查询返回包含所有属性的HealthLogs。如果您只想检索特定属性,您可以在HealthLog
中添加selectnewhealthlog(siteId,rtc,sigplan,cycle\u time,…)
到您的查询中,并在HealthLog
中使用合适的构造函数
请注意,代码片段可能尚未准备好使用,因为我不知道您的模型和属性名称。hibernate的哪个版本?@NicolasFilotto 4.1.9.FinalYou不能在HQL的from子句中使用子查询。
org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: ( near line 1, column 16 [ select f from (select h from com.traff.hibernate.model.HealthLog as h where rtc>='1974-08-01 14:10:00.0' and rtc <'1974-09-01 23:46:20.6' and siteId = 20 order by rtc desc limit 50000 ) as f order by rtc asc ]
at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54)
at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47)
at org.hibernate.hql.internal.ast.ErrorCounter.throwQueryException(ErrorCounter.java:79)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:276)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:180)
at org.hibernate.hql.intern
Criteria criteria = createEntityCriteria();
criteria.add(Restrictions.ge("rtc", fromDate));
criteria.add(Restrictions.lt("rtc", toDate));
criteria.add(Restrictions.eq("siteId", siteId));
criteria.setMaxResults(limit);
criteria.addOrder(Order.asc("rtc"));
criteria2 = criteria;
criteria2.addOrder(Order.desc("rtc"));
return criteria2.list();
Session session = factory.openSession();
Query query = session
.createQuery("FROM HealthLog "
+ "WHERE rtc >= :rtcL and rtc < :rtcG and siteId = :siteId "
+ "ORDER BY rtc DESC");
query.setParameter("rtcL", fromDate);
query.setParameter("rtcG", toDate);
query.setParameter("siteId", siteId);
query.setFirstResult(0);
query.setMaxResults(recordLimit);
List<HealthLog> res = query.list();
session.close();
Collections.sort(res, new Comparator<HealthLog>() {
public int compare(HealthLog o1, HealthLog o2) {
return o1.getRtc().compareTo(o2.getRtc());
}
});