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我堅持一個非常簡單的條件查詢的問題:Hibernate的簡單條件查詢解決問題
sess .createCriteria(user.class, "user")
.user_c.add(Restrictions.eq("user.status", 1))
.user_c.createAlias("user.userCategories","ucs")
.add(Restrictions.eq("ucs.category_id",1));
.add(Restrictions.eq("ucs.category_id",'yes'));
.add(Restrictions.eq("ucs.category_id",2));
.add(Restrictions.eq("ucs.category_id",'no')).list();
當然,這導致沒有用戶。
在SQL我也試了一下:
Select * FROM users user , ec_user_category uc where
uc.user_login = user.login AND
uc.status = 1 AND
((uc.category_id = 1 AND uc.value = 'yes') AND (uc.category_id = 2 AND uc.value = 'no'))
也沒有,當然用戶在SQL
兩種解決方案,不是很有效,我認爲:
Select a.login from
(Select user.login , COUNT(*) as counter FROM users user , ec_user_category uc
where user.status = 1
and uc.user_login = user.login
and
((uc.category_id = 1 and uc.value = 'yes')
OR (uc.category_id = 2 and uc.value = 'no'))
GROUP BY user.login) a where a.counter = 2
其他:
Select * FROM users u
JOIN user_category uc on uc.user_login = u.login
JOIN user_category uc2 on uc2.user_login = u.login
WHERE (uc.category_id = 1 and uc.value = 'yes')
AND (uc2.category_id = 2 and uc2.value = 'no')
這些r結果給了我很好的信息,但我不認爲這是正確的方式。我將如何使用Criteria API在Hibernate中實現這一點。
或者需要我在我的數據庫中的新表?