基于另一个表中的数据从一个表中获取数据的正确的Hibernate查询是什么？

Question

I have two tables, Device contains details of a device, including if it is assigned, and CustDevice which contains additional information for devices that have been assigned to a customer.

I need to select records from the Device table if it has been assigned to a particular customer.

My first naive stab at a query was:

from Device where Device.deviceId = CustDevice.deviceId and Device.status=2 and CustDevice.accountId=33

That obviously does not work, but it explains the relationship I am trying to do. I attempted to add a join in the mix, but I do not know the proper syntax for joining two tables.

I tried:

from Device dev join dev.deviceId CustDevice where dev.deviceId = CustDevice.deviceId and dev.deviceStatus = 2 and CustDevice.accountId=33

But that doesn't work either. Can anyone help me out with this query?? Thanks

Answer 1

This sounds like a left join, that is all of a table plus the joined table if it is referenced.

Here is and article on left joins in Hibernate.

http://www.jairrillo.com/blog/2009/01/29/how-to-use-left-join-in-hibernate-criteria/