Hibernate Criteria条件或OneToMany属性值的子查询

我的应用程序的一个组件记录用户使用http URL发送的参数。映射情况如下：Hibernate Criteria条件或OneToMany属性值的子查询

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; 
}

让每URL总是2级的参数被传递假设：U和L

我需要使用Hibernate的标准（从规范强制性），以便它返回到创建一个查询我所有的ActivityLogs都有一个特定的值。即：U = AAA和L = BBB

我想是这样的：

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")));

但在这里我卡住了。我试图在这方面添加像独特和分组这样的投影，但仅仅得到正确的结果是不够的。

我想也使用这个标准作为子条件，因此要计算任何ActivityLog的行数并只保留count（*）= 2（所有参数都符合条件）的记录，但是我无法找到如何与子查询做到这一点。

有关如何解决上述问题的任何想法？在SQL我会做这样的事情：

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

感谢

来源

2014-06-05 malavock

使用子查询

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));

解决

来源

2014-06-09 13:25:58 malavock

Hibernate Criteria条件或OneToMany属性值的子查询

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