休眠分離查詢作爲條件查詢的一部分

Question

java專家能否請您幫助我將分離查詢編寫爲以下SQL語句的條件查詢的一部分。

select A.* 
FROM AETABLE A 
where not exists 
(
    select entryid 
    FROM AETABLE B 
    where B.classpk = A.classpk 
    and B.userid = A.userid 
    and B.modifiedDate > A.modifiedDate 
) 
and userid = 10146 

Answer 1

您需要編寫一個correlated subquery。假設屬性/類名稱與上面的列/表名稱匹配：

DetachedCriteria subquery = DetachedCriteria.forClass(AETable.class, "b") 
.add(Property.forName("b.classpk").eqProperty("a.classpk")) 
.add(Property.forName("b.userid").eqProperty("a.userid")) 
.add(Property.forName("b.modifiedDate").gtProperty("a.modifiedDate")); 

Criteria criteria = session.createCriteria(AETable.class, "a") 
.add(Property.forName("userid").eq(new Integer(10146))) 
.add(Subqueries.notExists(subquery); 

Answer 2

只是對上述查詢的一個補充。如果entryid不是主鍵，那麼您需要添加投影。

 

DetachedCriteria subquery = DetachedCriteria.forClass(AETable.class, "b") 
.add(Property.forName("b.classpk").eqProperty("a.classpk")) 
.add(Property.forName("b.userid").eqProperty("a.userid")) 
.add(Property.forName("b.modifiedDate").gtProperty("a.modifiedDate")) 
.add(setProjection(Projections.property("entryId")); // Additional projection property 

Criteria criteria = session.createCriteria(AETable.class, "a") 
.add(Property.forName("userid").eq(new Integer(10146))) 
.add(Subqueries.notExists(subquery);