日期差异（天）限制休眠

Question

I am using Hibernate and Criteria API to write my database quires. What I need to do is I need two dates difference in days and compare that days with with specific number.

Eg Commonly written criteria restriction as:

criteria.add(Restrictions.eq("somProperty", someValue));

What I needs is:

criteria.add(Restrictions.ge("dateProperty1 - dateProperty2", 15));

Means date difference between two dates is greater than or equal 15 days.

I don't see how to achieve this. And yes I did lots of Google to find out the possible solution but didn't get proper material what I need.

Answer 1

If you check the documentation of the Restrictions class, you will see that:

• most functions operate on a "property vs value" pair (just like in your first example)
• the remaining comparator functions operate on "property vs other property" pair

But no customized function is available for your case. So what option you have is using the sqlRestriction , which can be used to express this condition in a native form of your DBMS. That would be a different, but much easier problem, altough clearly not as elegant as your original idea.