如题,Oracle数据库里面有一批记录,现在我想根据其中一个叫:txn_date的字段来查询记录,在Hbm文件中我配置了该HQL,如下所示:
<sql-query name="job.getJobByDate"> select {job.*} from Newsletter_Message job where to_char(:dateType,'yyyy-mm-dd hh24:mi') = to_char(:jobDate, 'yyyy-mm-dd hh24:mi') <return alias="job" class="com.newsletter.domain.job.Job" /> </sql-query>
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在DAO方法中我使用了Spring的HibernateTemplate,方法如下:
public List<Job> getJobByDate(final Date jobDate, final String dateType) { return (List<Job> getHibernateTemplate().executeFind( new HibernateCallback() { public Object doInHibernate(Session session) throws HibernateException { Query query = session.getNamedQuery("job.getJobByDate"); query.setString("dateType", dateType); query.setDate("jobDate",jobDate); return query.list(); } }); }
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Hibernate生成的SQL语句如下
select job.TXN_NO as TXN1_5_0_, job.TXN_TYPE as TXN2_5_0_, job.TXN_DATE as TXN3_5_0_, from Newsletter_Message job where to_char(?, 'yyyy-mm-dd hh24:mi') = to_char(?, 'yyyy-mm-dd hh24:mi')
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每次执行时,总是抛异常,说:
org.springframework.dao.DataIntegrityViolationException: Hibernate operation: could not execute query;
.....
Caused by: java.sql.SQLException: ORA-01722: invalid number
我实在不明白为什么会报这个错误,难道Hibernate在set date或者set string之前不会对其进行格式的转换吗?于是我又换了另外一个HQL语句,在代码里面提前将Date格式成String,但还是报错:
where to_char(dateType,'yyyy-mm-dd hh24:mi') = :strDate
后来实在没办法了,用了一阴招,代码如下,测试通过,但是觉得这种代码太丑陋了。
public List<Job> getJobByDate(final Date jobDate, final String dateType) { return getHibernateTemplate().executeFind(new HibernateCallback() { public Object doInHibernate(Session session) throws HibernateException {
String strDate = DateUtil.convertDateToString(jobDate, "yyyy-MM-dd HH:mm"); Query query = session.createQuery("from Job job where " + "to_char(" + dateType + ",'yyyy-mm-dd hh24:mi') = '" + strDate + "'"); return (List<Job>) query.list(); } }); }
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不知道各位能否解析一下上面那个报错的原因,谢谢先了!
[该贴被pengpenglin于2008-05-22 16:55修改过]