Comparing two columns in Hibernate Criteria

Question

I have a table in Postgre Database. The table has 2 timestamp format columns. I need those rows where one column timestamp is not equals the second column timestamp.

For the below query I need the Hibernate criteria restrictions.

select * from A where column1<>column2

Answer 1

Did you try something like that?

CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<Foo> cQuery = builder.createQuery(Foo.class);
Root<Foo> from = cQuery.from(Foo.class);
CriteriaQuery<Foo> select = cQuery.select(from);
select.where(builder.notEqual(from.get("col1"), from.get("col2")));
List<Foo> result = entityManager.createQuery(select).getResultList();

Answer 2

Given your comment here , you'll have to do a full table scan, which will create troubles with a bigger table. You will likely need to change your approach altogether, and introduce a field which says something like "IsUpdated". Or, when creating that record, UpdatedTime should be set to null, indicating it hasn't been updated yet. Then, you can do a query like "give all records where UpdatedTime is not null".