使用Criteria或HQL的优点和缺点是什么?Criteria API是一种在Hibernate中表达查询的面向对象的好方法,但有时Criteria queries比HQL更难理解/构建。

什么时候使用标准,什么时候使用HQL?在哪些用例中您更喜欢什么?还是说这只是个人口味的问题?


当前回答

还有另一种方法。我最终创建了一个基于hibernate原始语法的HQL解析器,这样它就可以首先解析HQL,然后动态地注入动态参数或自动为HQL查询添加一些通用过滤器。效果很好!

其他回答

当我不知道哪些输入将用于哪些数据时,我通常使用Criteria。就像在一个搜索表单上,用户可以输入1到50个项目中的任何一个,我不知道他们会搜索什么。在检查用户正在搜索的内容时,很容易将更多内容添加到条件中。我认为在这种情况下放置HQL查询会更麻烦一些。当我确切地知道我想要什么时,HQL是很棒的。

Criteria是一个面向对象的API,而HQL意味着字符串连接。这意味着面向对象的所有好处都适用:

All else being equal, the OO version is somewhat less prone to error. Any old string could get appended into the HQL query, whereas only valid Criteria objects can make it into a Criteria tree. Effectively, the Criteria classes are more constrained. With auto-complete, the OO is more discoverable (and thus easier to use, for me at least). You don't necessarily need to remember which parts of the query go where; the IDE can help you You also don't need to remember the particulars of the syntax (like which symbols go where). All you need to know is how to call methods and create objects.

由于HQL非常像SQL(大多数开发人员已经非常了解SQL),因此这些“不必记住”参数就没有那么重要了。如果HQL有更大的不同,那么这就更重要了。

我不想在这里白费口舌,但有一点很重要,那就是Criteria查询现在已被弃用。使用HQL。

这里的大多数答案都是误导性的,并提到标准查询比HQL慢,但事实并非如此。

如果你深入研究并执行一些测试,你会发现标准查询比常规HQL执行得更好。

同样,通过Criteria Query,你可以得到HQL所没有的面向对象的控制。

更多信息请阅读这里的答案。

We used mainly Criteria in our application in the beginning but after it was replaced with HQL due to the performance issues. Mainly we are using very complex queries with several joins which leads to multiple queries in Criteria but is very optimized in HQL. The case is that we use just several propeties on specific object and not complete objects. With Criteria the problem was also string concatenation. Let say if you need to display name and surname of the user in HQL it is quite easy (name || ' ' || surname) but in Crteria this is not possible. To overcome this we used ResultTransormers, where there were methods where such concatenation was implemented for needed result. Today we mainly use HQL like this:

String hql = "select " +
            "c.uuid as uuid," +
            "c.name as name," +
            "c.objective as objective," +
            "c.startDate as startDate," +
            "c.endDate as endDate," +
            "c.description as description," +
            "s.status as status," +
            "t.type as type " +
            "from " + Campaign.class.getName() + " c " +
            "left join c.type t " +
            "left join c.status s";

Query query =  hibernateTemplate.getSessionFactory().getCurrentSession().getSession(EntityMode.MAP).createQuery(hql);
query.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);
return query.list();

因此,在本例中,返回的记录是所需属性的映射。