Java 对OneToMany属性值休眠条件或子查询
我的应用程序的一个组件记录用户使用http URL发送的参数。映射如下所示:Java 对OneToMany属性值休眠条件或子查询,java,hibernate,criteria,Java,Hibernate,Criteria,我的应用程序的一个组件记录用户使用http URL发送的参数。映射如下所示: public class ActivityLog { @Column(name = "id") private Long id; @OneToMany(mappedBy="activityLog", fetch = FetchType.LAZY, cascade = CascadeType.ALL) protected List<ActivityLogParameter>
public class ActivityLog {
@Column(name = "id")
private Long id;
@OneToMany(mappedBy="activityLog", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
protected List<ActivityLogParameter> activityLogParameters = new ArrayList<ActivityLogParameter>();
}
public class ActivityLogParameter {
@Column(name = "id")
private Long id;
@Column(name = "key", length=10)
protected String key;
@Column(name = "value", length=50)
protected String value;
@ManyToOne(fetch = FetchType.LAZY, cascade={CascadeType.MERGE})
@JoinColumn(name="activity_log_id")
protected ActivityLog activityLog;
}
但我被困在这里了。我试着在上面添加像distinct和group by这样的投影,但这还不足以得到正确的结果
我还尝试将此条件用作子条件,以便计算任何ActivityLog的行数,并仅保留count*=2的记录所有参数都与条件匹配,但我找不到如何使用子查询
你对如何解决上述问题有什么想法?在SQL中,我会这样做:
Criteria criteria = getCurrentSession().createCriteria(ActivityLog.class, "al");
// create alias
criteria = criteria.createAlias("activityLogParameters", "alp",JoinFragment.LEFT_OUTER_JOIN);
// create transformer to avoid duplicate results
criteria = criteria.setResultTransformer(CriteriaSpecification.DISTINCT_ROOT_ENTITY);
criteria = criteria.setFetchMode("al.activityLogParameters", FetchMode.SELECT);
//filters
criteria = criteria.add(Restrictions.or(Restrictions.eq("alp.value", UValue), Restrictions.ne("alp.key", "L")));
criteria = criteria.add(Restrictions.or(Restrictions.eq("alp.value", LValue), Restrictions.ne("alp.key", "U")));
select activity_log_id from (
select count(*) as ct, activity_log_id
from activity_log_parameter alp inner join activity_log al on alp.activity_log_id=al.id
where (alp.value='visitor' or alp.key<>'U')
and (alp.value='room1' or alp.key<>'L')
group by activity_log_id
) as subq
where subq.ct = 2
谢谢使用子查询解决
DetachedCriteria subquery = DetachedCriteria.forClass(ActivityLogParameter.class, "alp")
.createAlias("activityLog", "al",JoinFragment.LEFT_OUTER_JOIN)
.setProjection(Projections.projectionList()
.add(Projections.count("id"), "alpId"));
subquery = subquery.add( Property.forName("al.id").eqProperty("mainAl.id") );
subquery = subquery.add(Restrictions.or(Restrictions.eq("alp.value", UValue), Restrictions.ne("alp.key", "L")));
subquery = subquery.add(Restrictions.or(Restrictions.eq("alp.value", LValue), Restrictions.ne("alp.key", "U")));
Criteria criteria = getCurrentSession().createCriteria(type, "mainAl");
criteria = criteria.add(Subqueries.eq(new Long(2), subquery));