Delete records from more than 1 year ago

Question

I'm saving twitter tweets in my database with spring JPA Repositories. The date of the tweet is saved as Datetime in the MySQL db. Now I want to delete all tweets that are older than one year. I saw there is the function CURRENT_TIME and I thought of something like CURRENT_TIME - 360. I know thats not the correct syntax but I have no idea how to do this. Here is what I have:

@Modifying
@Transactional
@Query("DELETE FROM Tweetpost t WHERE t.createdAt > ")
int removeOlderThan();

EDIT SOLVED:

Repository:

@Modifying
    @Transactional
    @Query("DELETE FROM Tweetpost m WHERE m.createdAt < :date")
    int removeOlderThan(@Param("date") java.sql.Date date);

Service:

public void removeOldItems() {
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.DATE, -360);

        java.sql.Date oneYear = new java.sql.Date(cal.getTimeInMillis());

        tweetRepository.removeOlderThan(oneYear);


    }

Answer 1

For this you need 2 steps. First of all you need a method that will take as a parameter the date of which you want to delete the messages and you dont need tha @Query annotation at all.

So in your repository you must have something like

    @Modifying
    public void deleteByCreatedAtBefore(Date expiryDate);

Now in your service method, you will calculate the Date and pass it on like this

    public void performTweetCleanup(){
       //calculate date
       Calendar cal = Calendar.getInstance();
       Date today = cal.getTime();
       cal.add(Calendar.YEAR, -1);
       Date previousYear = cal.getTime();

       //call the method
       MyTweeterRepository.deleteByCreatedAtBefore(previousYear);
     }

Answer 2

SOLVED:

Repository:

@Modifying
    @Transactional
    @Query("DELETE FROM Tweetpost m WHERE m.createdAt < :date")
    int removeOlderThan(@Param("date") java.sql.Date date);

Service:

public void removeOldItems() {
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.DATE, -360);

        java.sql.Date oneYear = new java.sql.Date(cal.getTimeInMillis());

        tweetRepository.removeOlderThan(oneYear);


    }