Java – how to select from HQL
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Java
I am a novice to HQL and have an SQL expression that I need to convert, but I cannot select an SQL statement:
select SenseDate as Time,SenseValue as Value from UserData where NetworkID = '23' and IOdeviceid = '129' and SenseDate >= DateAdd("d",-1,GETDATE()) and SenseDate<=GETDATE()@H_502_3@我可以在HQL中运行这部分而不会出现问题:
from UserData where NetworkID = '23' and IOdeviceid = '129' and SenseDate >= DateAdd(d,GETDATE()) and SenseDate<=GETDATE()@H_502_3@但是我只想要返回SenseDate和SenseValue值,有人可以告诉我如何选择当我尝试添加select SenseDate,SenseValue等时我会在Netbeans中遇到错误
Solution
You can use HQL to select fields / columns It looks like this:
select SenseDate,SenseValue from UserData where NetworkID = '23' and IOdeviceid = '129' and SenseDate >= DateAdd(d,GETDATE()) and SenseDate <= GETDATE()@H_502_3@执行此操作时,您将收到一个对象数组列表:
final List<Object[]> values = query.list();@H_502_3@列表中的每个元素代表一个找到的行.数组本身包含两个选定的字段,其顺序与您在语句中声明的顺序相同.
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