JPA CriteriaBuilder子查询方式是什么

本篇内容主要讲解"JPA CriteriaBuilder子查询方式是什么"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"JPA CriteriaBuilder子查询方式是什么"吧!

JPA CriteriaBuilder子查询

给自己做个备忘

/** 检索关键字 */if (keyWord != null && !keyWord.trim().equals("")){    // 创建子查询对象 Subquery subquery = criteriaQuery.subquery(Store.class); Root root2 = subquery.from(Store.class); subquery.select(root2. get("id")); subquery.where(criteriaBuilder.like(root2. get("name"), "%" + keyWord + "%"));  // 给读者稍微解释一下，也给自己留个记忆    // 这里的意图是将关键做两个模糊检索，一个是在本表中检索title字段    // 就是criteriaBuilder.like(root. get("title"), "%" + keyWord + "%")    // 二是将字段与子表中的检索出来的id与本表中store字段做匹配    // criteriaBuilder.in(root.get("store")).value(subquery))    // 至于id怎么检索出来的，用子查询模糊检索出来的，参照上面的子查询  restrictions = criteriaBuilder.and(restrictions,criteriaBuilder.or(criteriaBuilder.like(root. get("title"), "%" + keyWord + "%"),criteriaBuilder.in(root.get("store")).value(subquery)));}

Jpa在CriteriaBuilder中添加where条件NotIn子查询

final CriteriaBuilder cb = entityManager.getCriteriaBuilder();final CriteriaQuery cq = cb.createQuery(Person.class);final Root root = cq.from(Person.class);cq.select(root);final Subquery subquery = cq.subquery(Integer.class);final Root validityIDSQ = subquery.from(Person.class);subquery.select(cb.max(validityIDSQ.get(Person_.validityID)));subquery.groupBy(validityIDSQ.get(Person_.personID));cq.where(cb.in(root.get(Person_.validityID)).value(subquery));// 将生成select    person0_.id as id1_0_,    person0_.personID as personID2_0_,    person0_.validityID as validity3_0_,    person0_.value as value4_0_from    person person0_where    person0_.validityID in (            select                max(person1_.validityID)            from                person person1_            group by                person1_.personID)

自身所需NotIn语法，所以是

Subquery manageUserSubquery = query.subquery(String.class);                Root relationUserManagePlateDomainRoot = manageUserSubquery.from(RelationUserManagePlateDomain.class);                Join relationUserManagePlateDomainUserDomainJoin = relationUserManagePlateDomainRoot.join(RelationUserManagePlateDomain_.user, JoinType.INNER);                Subquery subquery = manageUserSubquery.select(relationUserManagePlateDomainUserDomainJoin.get(UserDomain_.id));                Predicate predicate1 = criteriaBuilder.and(criteriaBuilder.not(criteriaBuilder.in(root.get(UserDomain_.id)).value(manageUserSubquery)));                predicate.getExpressions().add(predicate1);

到此，相信大家对"JPA CriteriaBuilder子查询方式是什么"有了更深的了解，不妨来实际操作一番吧！这里是网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！