Question

我有以下复杂查询，它是视图，我们希望消除视图并直接映射到表，我们使用Hibernate2。是否可以将多个表映射到Hibernate2中的一个类？这是我的询问。

SELECT DISTINCT 
              r.id, 
        rtype.name AS model_object_type_name, 
        rtype.id AS model_object_type_id, 
        c.id AS case_id, 
        r.source_item_id AS person_id, 
        c.file_number, 
        c.start_date, 
                a.app_start_date AS app_date, 
        a.app_start_time, 
        a.outcome_type AS app_outcome,
        c.primary_reference_id, 
        aval.string_value AS last_mncis_refresh
FROM         my.case_file AS c INNER JOIN
             my.relation AS r ON c.id = r.target_item_id INNER JOIN
             my.item_type AS rtype ON r.item_type_id = rtype.id INNER JOIN
             my.person AS p ON p.id = r.source_item_id INNER JOIN
             my.relation AS rc ON c.id = rc.target_item_id INNER JOIN
            my.attr_value AS aval ON c.id = aval.item_id AND aval.name='test' 
             INNER JOIN  my.item_type AS ptype ON p.item_type_id = ptype.id 
WHERE     (ptype.name = 'Test') 
AND (rtype.name = 'Test1' OR rtype.name = 'Test2' OR rtype.name = 'Test3') 
AND (rc.name = 'Test4')

感谢。

Answer 1

这是可能的。请参阅description of the join element（该文档适用于hibernate 3.5版。我不知道该元素首先引入了哪个版本。请查看您的版本）。直到hibernate规范，连接仅针对1：1关系设计，但如果它仅用于读取n：1关系也应该起作用（但对于更新，插入和删除，可能不适用于：1关系））。

Hibernate映射单个类到多个表

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