Question

有人知道如何使用hibernate ResultTransformer吗？我想将实体转换为dto。这是我的代码

Criteria criteria = session.createCriteria(Person.class)
criteria.add(Restrictions.eq("id",id));
PersonDto personDto = criteria.uniqueResult();

抛出一个classCastException，表示无法将Person转换为PersonDto。

其他问题：这段代码工作正常，但为什么不是上面的代码？

Criteria criteria = session.createCriteria(Person.class);
List<PersonDto> personDtos = criteria.list();

Answer 1

如果你只是想转换实体，也许应该使用像推土机这样的工具 http://dozer.sourceforge.net/documentation/usage.html

使用transformList

的示例

Query query = session.createQuery(""
                    + "Select DISTINCT VP.versionId as parent from VersionData VP "
                    + "INNER JOIN VP.zvitId ZP "
                    + "INNER JOIN ZP.childrens CH "
                    + "INNER JOIN CH.versions CP "
                    + "where CP.zvitId.zvitId = :idList and VP.dend IS NULL"
                    )
                    .setParameter("idList", id)
                    .setResultTransformer(Transformers.aliasToBean(ParentIdList.class));
            @SuppressWarnings("unchecked")
            List<ParentIdList> result = query.list();

Parent IdList与返回查询值具有相同的属性名称公共类ParentIdList { private String parent;

    /**
     * @return the parents
     */
    public String getParent()
    {
        return parent;
    }

    /**
     * @param parents the parents to set
     */
    public void setParent(String parents)
    {
        this.parent = parents;
    }
    //getters, setters, hashcode, equals
}

如何使用AliasToBeanResultTransformer的transformList方法？

1 个答案: