问题
I have just started a Spring Roo application with Hibernate as a JPA2.0 provider. I am using the jars as follows:
hibernate-core-3.6.4.Final.jar
hibernate-commons-annotations-3.2.0.jar
hibernate-entitymanager-3.6.4.Final.jar
hibernate-jpa-2.0-api-1.0.0.Final.jar
hibernate-validator-4.1.0.Final.jar
I am using Annotations to handle the transactional aspect of the application, no problem there.
But there are other parts of the application that require very complex queries, and the way I had it handled in Hibernate before was to create a mapping file e.g (mybigdwquery.hbm.xml) where I would specify my query and its mapping object, a POJO. Not an @Entity. This works fine.
However, Through another question that I previously posted, I found out that in JPA 2.0 you cannot have queries mapped to a POJO, everything has to be mapped to an @Entity (a db table no?).
So my question is as follows:
Is there any way that I can have my 'mybigdwquery.hbm.xml' file loaded in my persistence.xml as a hbm.xml so that I can call the named query?
My persistence.xml is as follows:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="persistenceUnit" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<!-- <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/> -->
<!-- value="create" to build a new database on each run; value="update" to modify an existing database; value="create-drop" means the same as "create" but also drops tables when Hibernate closes; value="validate" makes no changes to the database -->
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>
<property name="hibernate.hbm2ddl.auto" value="create"/>
<property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy"/>
<property name="hibernate.connection.charSet" value="UTF-8"/>
</properties>
</persistence-unit>
</persistence>
The file that I need loaded:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="edu.kdc.visioncards.pojo">
<class name="AttendanceBreakDown">
<cache usage="read-only" />
<id name="studentName"/>
<property name="pupilId"></property>
<property name="enrollmentStatus"></property>
<property name="attendanceLevel"></property>
<property name="attendanceDays"></property>
<property name="authorizedAbsences"></property>
<property name="unexcusedAbsences"></property>
<property name="excusedAbsences"></property>
<property name="tardies"></property>
<property name="attendancePct"></property>
</class>
<sql-query name="attendanceDetailsBySchoolAndGradingPeriod">
<return alias="attSchGr" class="edu.kdc.visioncards.pojo.AttendanceBreakDown">
<return-property name="studentName" column="student_name"/>
<return-property name="pupilId" column="student_id"/>
<return-property name="enrollmentStatus" column="enrollment_status"/>
<return-property name="attendanceLevel" column="attendance_Level"/>
<return-property name="attendanceDays" column="attendance_days"/>
<return-property name="authorizedAbsences" column="auth_abs"/>
<return-property name="unexcusedAbsences" column="unx_abs"/>
<return-property name="excusedAbsences" column="x_abs"/>
<return-property name="tardies" column="tardies"/>
<return-property name="attendancePct" column="att_pct"/>
</return>
select
a.student_name
,a.student_id
,a.enrollment_status
,a.attendance_days
,a.Attendance_Level
,b.authorized_absences as auth_abs
,nvl(c.unx_abs,0) as unx_abs
,nvl(d.x_abs, 0) as x_abs
,nvl(e.tardies, 0) as tardies
,a.att_pct
from
(select
s.student_name
,s.student_id
,s.student_activity_indicator as enrollment_status
,sum(fas.attendance_days) as attendance_days
,round((sum(fas.attendance_value) / sum(fas.attendance_days))* 100,2) as att_pct
,case when(round((sum(fas.attendance_value) / sum(fas.attendance_days))* 100,2) <= 87)
then 'Intervene'
when(round((sum(fas.attendance_value) / sum(fas.attendance_days))* 100,2) >87 and
round((sum(fas.attendance_value) / sum(fas.attendance_days))* 100,2) <= 89.9)
then 'Concern'
when(round((sum(fas.attendance_value) / sum(fas.attendance_days))* 100,2) >=90 and
round((sum(fas.attendance_value) / sum(fas.attendance_days))* 100,2) <= 95)
then 'Baseline'
else 'Is Clean'
end AS Attendance_Level
from K12INTEL_DW.ftbl_attendance_stumonabssum fas
inner join k12intel_dw.dtbl_students s
on fas.student_key = s.student_key
inner join K12INTEL_DW.dtbl_schools ds
on fas.school_key = ds.school_key
inner join k12intel_dw.dtbl_school_dates dsd
on fas.school_dates_key = dsd.school_dates_key
where dsd.rolling_local_school_yr_number = 0
and ds.school_code = ?
and s.student_activity_indicator = 'Active'
and fas.LOCAL_GRADING_PERIOD = ?
and s.student_current_grade_level = ?
group by s.student_id, s.student_name, s.student_activity_indicator
having (sum(fas.attendance_value) / sum(fas.attendance_days)) < .95
) a
inner join
(select t.student_id
,sum(t.auth_abs) as authorized_absences
from(
select dstud.student_id
,case when(fas.excused_authorized) in ('NA', 'No')
then 0 else 1
end as auth_abs
from K12INTEL_DW.ftbl_attendance_stumonabssum fas
inner join K12INTEL_DW.dtbl_schools ds
on fas.school_key = ds.school_key
inner join k12intel_dw.dtbl_students dstud
on dstud.student_key = fas.student_key
inner join k12intel_dw.dtbl_school_dates dsd
on dsd.school_dates_key = fas.school_dates_key
where dsd.rolling_local_school_yr_number = 0
and dstud.student_activity_indicator = 'Active'
and ds.school_code = ?
and fas.LOCAL_GRADING_PERIOD = ?
and dstud.student_current_grade_level = ?
) t
group by t.student_id)b
on b.student_id = a.student_id
left outer join
( select dstud.student_id,
count(fas.excused_absence) as unx_abs
from K12INTEL_DW.ftbl_attendance_stumonabssum fas
inner join K12INTEL_DW.dtbl_schools ds
on fas.school_key = ds.school_key
inner join k12intel_dw.dtbl_students dstud
on dstud.student_key = fas.student_key
inner join k12intel_dw.dtbl_school_dates dsd
on dsd.school_dates_key = fas.school_dates_key
where dsd.rolling_local_school_yr_number = 0
and dstud.student_activity_indicator = 'Active'
and fas.excused_absence = 'Un-excused absence'
and ds.school_code = ?
and fas.LOCAL_GRADING_PERIOD = ?
and dstud.student_current_grade_level = ?
group by dstud.student_id
) c
on c.student_id = a.student_id
left outer join
(select dstud.student_id, count(fas.excused_absence) as x_abs
from K12INTEL_DW.ftbl_attendance_stumonabssum fas
inner join K12INTEL_DW.dtbl_schools ds
on fas.school_key = ds.school_key
inner join k12intel_dw.dtbl_students dstud
on dstud.student_key = fas.student_key
inner join k12intel_dw.dtbl_school_dates dsd
on dsd.school_dates_key = fas.school_dates_key
where dsd.rolling_local_school_yr_number = 0
and dstud.student_activity_indicator = 'Active'
and fas.excused_absence = 'Excused absence'
and ds.school_code = ?
and fas.LOCAL_GRADING_PERIOD = ?
and dstud.student_current_grade_level = ?
group by dstud.student_id) d
on d.student_id = a.student_id
left outer join
(select s.student_id
,sum(a.attendance_value) tardies
from k12intel_dw.ftbl_attendance a
inner join k12intel_dw.dtbl_school_dates sd
on a.school_dates_key = sd.school_dates_key
inner join k12intel_dw.dtbl_students s
on a.student_key = s.student_key
inner join k12intel_dw.dtbl_schools sc
on sc.school_key = s.school_key
where 1=1
and sd.rolling_local_school_yr_number = 0
and a.attendance_type in ('LA','LP','LF')
and sc.school_code= ?
and s.student_current_grade_level = ?
group by s.student_id) e
on e.student_id = a.student_id
</sql-query>
</hibernate-mapping>
This is my DAO:
@Repository
public class K12DaoImpl implements K12DaoManager{
@PersistenceContext
private EntityManager em;
// @Autowired
// private SessionFactory sessionFactory;
//
// public void setSessionFactory(SessionFactory sessionFactory) {
// this.sessionFactory = sessionFactory;
// }
@Override
@Transactional(readOnly = true)
public List<AttendanceBreakDown> getAttendanceBreakDownBySchoolAndGP(int school, String gradingPeriod, String gradeLevel) {
Object values[] = new Object[]{new Integer(school), gradingPeriod, gradeLevel,
new Integer(school), gradingPeriod, gradeLevel,
new Integer(school), gradingPeriod, gradeLevel,
new Integer(school), gradingPeriod, gradeLevel,
new Integer(school), gradeLevel
};
// Call Named Query through JPA
// Query query = em.createNamedQuery("attendanceDetailsBySchoolAndGradingPeriod");
//
// for (int i = 0; i < values.length; i++) {
// query.setParameter(i, values[i]);
// }
//
// List<AttendanceBreakDown> list = query.getResultList();
//
// Call Named Query through Hibernate's SessionFactory
// org.hibernate.Query query = sessionFactory.getCurrentSession().getNamedQuery("attendanceDetailsBySchoolAndGradingPeriod");
//
// for (int i = 0; i < values.length; i++) {
// query.setParameter(i, values[i]);
// }
//
// List<AttendanceBreakDown> list = query.list();
//Call Named Query through HibernateTemplate
//List<AttendanceBreakDown> list = getHibernateTemplate().findByNamedQuery("attendanceDetailsBySchoolAndGradingPeriod", values);
//return list;
return null;
}
}
Before, without using persistence.xml I had the typical hibernate.cfg.xml settings inside an applicationContext-datasource with it session factory, the session factory tied to the datasource etc.. an everything work fine.
Now I have persistence.xml, no more SessionFactory, EntityManager now.
How can I load hbm.xml files and execute them through Hibernate rather than through JPA 2.0 ?
If you see the commented code in the DAO If I was using a Hibernate config calling the named query through the HibernateTemplate (extending HibernateDaoSupport) was working. What would the code be like now ?
Thanks
回答1:
I have found the answer to my own question. To make it work this is what I have done:
Use <mapping-file>...hbm.xml</mapping-file> inside <persistence-unit> in persistence.xml. I really did not have the use the <mapping-file>...hbm.xml</mapping-file> tag as that was giving me all sorts of exceptions one of them was DuplicateMappingException. According to the docs I also thought I had to use that tag, but it turns out that you do not have to.Created edu/kdc/visioncards/pojo/AttendanceBreakDown.hbm.xml under src/main/resources
Finally in my DAO, I have as follows:
@Override @Transactional(readOnly = true) public List<AttendanceBreakDown> getAttendanceBreakDownBySchoolAndGP(int school, String gradingPeriod, String gradeLevel) { Object values[] = new Object[]{new Integer(school), gradingPeriod, gradeLevel, new Integer(school), gradingPeriod, gradeLevel, new Integer(school), gradingPeriod, gradeLevel, new Integer(school), gradingPeriod, gradeLevel, new Integer(school), gradeLevel }; org.hibernate.Session session = (Session) em.getDelegate(); org.hibernate.Query query = session.getNamedQuery("attendanceDetailsBySchoolAndGradingPeriod"); for (int i = 0; i < values.length; i++) { query.setParameter(i, values[i]); } List<AttendanceBreakDown> list = query.list(); return list; }
Now I can use JPA 2.0 through EntityManager and step down to Hibernate's Session to have access to all Hibernate features that JPA 2.0 does not offer.
来源：https://stackoverflow.com/questions/8363647/how-to-load-a-hibernate-xxx-hbm-cfg-file-in-a-jpa-2-0-project