Java JPA查詢

Question

我想從某個日期早於7天的數據庫中選擇所有入口。它通過SQLyog的工作正常，但在Java總是拋出這個錯誤：

[33, 76] The expression is not a valid conditional expression. 
[76, 101] The query contains a malformed ending. 

這是我在Java中查詢：

SELECT a FROM Applicants a WHERE (a.lastMod <= CURRENT_DATE - INTERVAL 7 DAY) ORDER BY a.applDate ASC 

可能的問題是 「CURRENT_DATE」 -part？

Answer 1

CURRENT_DATE沒問題，但INTERVAL 7 DAY不是有效的JPQL表達式。你需要提供日期作爲參數

WHERE a.lastMod <= :dateParam 

例子：

Query q = em.createQuery("SELECT a FROM Applicants a WHERE a.lastMod <= :dateParam ORDER BY a.applDate ASC"); 
q.setParameter("dateParam", dateParam); 
List<Applicants> applicants = (List<Applicants>)q.getResultList(); 

// or, to avoid casting (thanks to @DavidSN) 

TypedQuery<Applicants> q = em.createQuery("SELECT a FROM Applicants a WHERE a.lastMod <= :dateParam ORDER BY a.applDate ASC", Applicants.class); 
q.setParameter("dateParam", dateParam); 
List<Applicants> applicants = q.getResultList(); 

Answer 2

EntityManager em = ... 
Query q = em.createQuery ("SELECT a FROM Applicants a WHERE a.lastMod <= :dateParam"); 
q.setParameter("dateParam" , dateParam); 
List<blabla> results = q.getResultList();