休眠标准 - 或标准之间？答案

【问题标题】：Hiberate criteria - OR between criteria?休眠标准 - 或标准之间？
【发布时间】：2021-10-19 14:08:53
【问题描述】：

我有一个表 Prod，它与表 User 有 3 个 fk 关系：

Prod
-----
id
user_id_1
user_id_2
user_id_3

User
-----
id
firstname
lastname

鉴于搜索表单上可能存在 firstname> 和 lastname>，我想做类似（伪代码）的操作：

Find all Prod 
where
(user_id_1.firstname like <firstname> AND user_id_1.lastname like <lastname>) OR
(user_id_2.firstname like <firstname> AND user_id_2.lastname like <lastname>) OR
(user_id_3.firstname like <firstname> AND user_id_3.lastname like <lastname>)

使用 Hibernate 的 Criteria 对象，我相信执行关联表操作的方法是使用额外的 Criteria 对象：

Criteria prodCriteria = session.createCriteria(Prod.class);
Criteria user1Criteria = prodCriteria.createCriteria("userId1");
LogicalExpression user1Le = Restrictions.and(Restrictions.ilike("firstame", <firstname>, MatchMode.ANYWHERE), Restrictions.ilike("lastname", <lastname>, MatchMode.ANYWHERE));
user1Criteria.add(user1Le);

Criteria user2Criteria = prodCriteria.createCriteria("userId2");
LogicalExpression user2Le = Restrictions.and(Restrictions.ilike("firstame", <firstname>, MatchMode.ANYWHERE), Restrictions.ilike("lastname", <lastname>, MatchMode.ANYWHERE));
user2Criteria.add(user2Le);

Criteria user3Criteria = prodCriteria.createCriteria("userId3");
LogicalExpression user3Le = Restrictions.and(Restrictions.ilike("firstame", <firstname>, MatchMode.ANYWHERE), Restrictions.ilike("lastname", <lastname>, MatchMode.ANYWHERE));
user3Criteria.add(user3Le);

但是，这不会在我想要 OR 的关联 sub-criteria 对象之间产生 AND 吗？

有没有办法在 sub-criteria 对象之间执行 OR？我这样做是否正确？

【问题讨论】：

标签： java hibernate hibernate-criteria

【解决方案1】：

您可以通过使用显式别名来实现它：

Criterion criterionUser1 = Restrictions.and(Restrictions.ilike("user1.firstname", firstname, MatchMode.ANYWHERE),
                Restrictions.ilike("user1.lastname", lastname, MatchMode.ANYWHERE));
Criterion criterionUser2 = Restrictions.and(Restrictions.ilike("user2.firstname", firstname, MatchMode.ANYWHERE),
                Restrictions.ilike("user2.lastname", lastname, MatchMode.ANYWHERE));
Criterion criterionUser3 = Restrictions.and(Restrictions.ilike("user3.firstname", firstname, MatchMode.ANYWHERE),
                Restrictions.ilike("user3.lastname", lastname, MatchMode.ANYWHERE));

        Criteria prodCriteria2 = session
                                    .createCriteria(Prod.class)
                                    .createAlias("userId1", "user1")
                                    .createAlias("userId2", "user2")
                                    .createAlias("userId3", "user3")
                                    .add(Restrictions.or(criterionUser1, criterionUser2, criterionUser3));

【讨论】：