Question

我是Hibernate的新手，任何人都可以更正下面的SQL的HQL，找出目前正在为客户工作的独特员工。如果可能的话，请提供一些教程链接。

在解析SQL时，我能够从数据库中获取一些记录。也使用Native SQL，但是当我在HQL下面使用时，我无法接收任何记录。

SQL：

select distinct u.employeeid from employee u 
    inner join address ad on u.employeeid = ad.employeeid
    left join company cp on (ad.oldcompanyid = cp.currentcompanyid and cp.wokingornot='Y')
    left join client cl on (ad.oldcompanyid = cl.currentcompanyid and cl.wokingornot='Y') 
    where (u.lastdate is null and ad.lastdate is null) 
          and (cp.wokingornot = 'Y' or cl.wokingornot = 'Y');

请更正下面列出的HQL：

select distinct u from employee u ,address uo,company tp ,client mp  
inner join u.address uo 
left join uo.company tp   with tp.wokingornot= true  
left join uo.client mp with mp.wokingornot= true 
where (u.lastdate is null and uo.lastdate is null) 
and (tp.wokingornot= true or mp.wokingornot= true );

以下是我正在寻找HQL的实体：

public class employee {
public Int employeeid ;
public set<address> address;
public Date lastdate;
public Date Startdate;
}

public class address{
public int addressid;
public int oldcompanyid;
public employee employee;
public Date lastdate;
public Date Startdate;
}

public class company{
public int currentcompanyid;
public string wokingornot;
public address address;
}

public class client{
public int currentcompanyid;
public string wokingornot;
public address address;
}

Answer 1

看起来会更像这样。您将从Employee类通过Address down到Company和Client类获得整个对象图。

select distinct u from employee u
join u.address uo
left join uo.company tp
left join uo.client mp 
where u.lastdate is null and uo.lastdate is null
and (tp.wokingornot= true or mp.wokingornot= true )

如何使用条件为左外连接编写HQL？

1 个答案: