如何将SQL查询转换为HQL [英] how do i convert SQL query to HQL
本文介绍了如何将SQL查询转换为HQL的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
public class EmployeeUserMap {
@ManyToOne
@JoinColumn(name = "EMPLOYEEID", unique = true)
protected Employee employee;
@ManyToOne
@JoinColumn(name="USERID")
private User user;
}
public class RoleUserMap {
@ManyToOne
@JoinColumn(name = "ROLEID")
private Role role;
@ManyToOne
@JoinColumn(name = "USERID")
private User user;
}
下面是我的SQL查询.
Below is my SQL query.
select e.id ,e.firstname from employee_user_map o
left join role_user_map ru on ru.userid = o.userid
left join employee e on e.id = o.employeeid
where ru.roleid = (select r.id from role r where r.code='Role_Merchant')
我尝试过的HQL查询.
SELECT new com.erp.core.repository.value.LookupValue(o.id,o.firstName,o.firstName) FROM EmployeeUserMap o
LEFT JOIN o.user =
WHERE /*@{SYSTEM_CRITERIA}*/1=1 AND (UPPER(o.firstName) LIKE UPPER(CONCAT('%',:searchParam,'%')))
推荐答案
假设您拥有正确的映射,则应将hql查询形成为:
Assuming you have your mappings right, you should form the hql query as:
休眠版本<5.1.0:
Hibernate version < 5.1.0:
select new com.erp.core.repository.value.LookupValue(e.id,e.firstName)
from EmployeeUserMap eu
, RoleUserMap ru
, Employee e
, User u
, Role r
where r.code ='Role_Merchant'
and eu.user = u
and ru.user = u
and ru.role =r
and eu.employee = e
不要认为您这里确实需要子查询.
dont think you really need the subquery here..
更新:对于HIbernate 5.1.0+版本,可以使用不相关的实体联接,因此在您的情况下:
Update: for version 5.1.0+ of HIbernate it is possible to use unrelated entity joins, so in your case:
select new com.erp.core.repository.value.LookupValue(e.id,e.firstName)
from EmployeeUserMap o
left join o.user u
left join o.employee e
left join RoleUserMap ru on ru.user.id = u.id
left join ru.role r
where r.code ='Role_Merchant'
这篇关于如何将SQL查询转换为HQL的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文