首先JpaSpecificationExecutor這個介面的過載的findAll方法，Specification 用於拼接條件Pageable分頁引數，Sort排序引數。簡單記錄分頁查詢實現方式

查詢結果

Hibernate: select user0_.id as id1_0_, user0_.age as age2_0_, user0_.creat_date as creat_da3_0_, user0_.name as name4_0_, user0_.pwd as pwd5_0_, user0_.title as title6_0_, user0_.update_date as update_d7_0_ from user user0_ where user0_.name=? and (user0_.age>10 or user0_.id<5) order by user0_.age asc, user0_.creat_date desc limit ?
2021-09-28 15:33:52.180 TRACE 7064 --- [nio-8080-exec-4] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [VARCHAR] - [laowang]
 

程式碼：

@Override
    public Page<User> listPageAllUser(PageData<User> pageData) {
        //2、jpa 自帶的分頁查詢，可組裝條件的
        Pageable pageable = PageRequest.of(pageData.getPageNumber()-1, pageData.getPageSize(),
                Sort.by("age").ascending().and(Sort.by("creatDate").descending()));
        /*
         * @param root:代表的查詢的實體類
         * @param query：可以從中得到Root物件，即告知JPA Criteria查詢要查詢哪一個實體類，
         * 還可以來新增查詢條件，還可以結合EntityManager物件得到最終查詢的TypedQuery 物件
         * @Param cb:criteriabuildre物件，用於建立Criteria相關的物件工程，當然可以從中獲取到predicate型別
         * @return:代表一個查詢條件
         */
        Specification<User> specification = (Specification<User>) (root, query, criteriaBuilder) -> {
            Path age = root.get("age");
            Path id = root.get("id");
            Predicate p1 = criteriaBuilder.gt(age,pageData.getParams().getAge());
            Predicate p2 = criteriaBuilder.lt(id,pageData.getParams().getId());
            Predicate p3 = criteriaBuilder.equal(root.get("name").as(String.class), pageData.getParams().getName());
            Predicate p = criteriaBuilder.and(p3,criteriaBuilder.or(p1,p2));
            return p;
        };
        Page<User> page = userDao.findAll(specification,pageable);
        return page;
    }
 

參考文章：jpa specification條件查詢

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