Calulating date difference in minutes by using HQL/SQL query

I have a field of time Timestamp in my MySQL database which is mapped to a date datatype in my Bean.

Now I want a query by which I can fetch all records in the database for which the difference between the current timestamp and the one stored in the database is > 20 minutes.

How can I do it?

What I want is

select T from MyTab T where T.runTime - c开发者_JAVA百科urrentTime > 20 minutes

I tried the following

Query  query =  getSession().createQuery("Select :nw - T.runTime   from MyTab T");
  query.setDate("nw", new Date());

It returns some values like -2.0110930179433E13 .

How can I model this in SQL/Hibernate? Even if I get some native SQL query (MySQL) then it's ok.

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I guess this link might help:

https://forum.hibernate.org/viewtopic.php?p=2393545

and this one is also very helful:

Hibernate Dialects + datediff function

Hope it helps.