JPQL查询日期与间隔

Question

I am using JPA and JPQL. And I am new in this world;-) My Query is now giving me data between 2 dates.

Query query =em.createQuery("SELECT d FROM DTable d JOIN d.history p WHERE (d.vehicle.id = :vehicleId) AND (p.timestamp BETWEEN :curentDate AND :date)");

How can I tell JPQL to filter the Data that he is giving me Data between 2 dates but with a time interval of 4 Minutes?.

I hope it is clear. Thanks for you suggestion.

Answer 1

Your requirement: the difference between two supplied dates should be at least four minutes. According to JPA 1.0 specification, comparison expression between dates must follow this pattern

datetime_expression comparison_operator datetime_expression

Where comparison_operator can be =, >, >=, <, <=, <>. What you can do is

Take the difference between your supplied dates as follows

Timestamp dateA ...
Timestamp dateB ...

Timestamp difference = new Timestamp(Math.abs(dateA.getTime() - dateB.getTime()));

And create a Timestamp which represents 4 minutes

Timestamp fourMinutes = new Timestamp(0, 0, 0, 0, 4, 0, 0);

Now your query should looks like

where :difference >= :fourMinutes