Adding complex and & Ors in hibernate

Recently i had to do a query as:

select * from t_table where (t.a=’a’ and t.b=’b’) or (t.a=’aa’ and t.b=’bb’). One way to get over this is via HQL query… which i hate.. i wanted to do it using criterias… finally Conjunction and disjunctions came for resque. Below is the code.

Session session = getSession();
try {
    Criteria crit = session.createCriteria(Table.class);
    Disjunction conMerOrs = Restrictions.disjunction();
    for (AB ab: ABList) {
        Conjunction ands = new Conjunction();
        ands.add(Restrictions.eq("a", ab.a()));
        ands.add(Restrictions.eq("b", ab.b));
        ors.add(ands);
    }
    crit = crit.add(ors);
    return crit.list();
} finally {
    session.close();
}

let me know if it helped