Hibernate - restricting sum of two properties

Question

I want to write a Criteria query, that will do something like this:

SELECT a, b FROM t WHERE a + b < 10

Is this possible using Criteria API?

Answer 1

Yes . You can use Restrictions.sqlRestriction() to define the where clause using native SQL.

   Integer condition = 10;
   List<Object[]> results = (List<Object[]>)session.createCriteria(someTable.class)
            .add(Restrictions.sqlRestriction("a + b < ?" , condition , StandardBasicTypes.INTEGER ))
            .setProjection(Projections.projectionList()
                   .add(Projections.property("a"))
                   .add(Projections.property("b"))
             )
            .list();

Important points :

• In the return result , the value of column a is stored in Object[0] while b is stored in Object [1] .

• The input parameters in the Restrictions.sqlRestriction() are the actual column name in the database while the input parameters in the Projections.property() are the java property name of the mapped Entity.