使用休眠本机查询的BigInteger结果错误

Question

I'm using Hibernate4 + PostgresSql. I need to get a list of ids from my DB without getting a whole object. I use a native query (because it's hierarchical) and it looks like:

String s = hierachical_part_skipped +"select id " +
                "from search_hierarchy " +
                "order by id";

Query q = getEntityManager().createNativeQuery(s);
List<Long> resList = new ArrayList<>();
List<BigInteger> biglist = q.getResultList();
for (Object id : biglist) {
    System.out.print(id+",");
    resList.add(id.longValue());
}

Well, 1 time out of three my bigList is filled with wrong values! I have 10,20,30,40,50,60,70,80,90,100 ... 27350 instead of 1, 2... 2735 (a zero is added to each value). Native query executed manually not through Hibernate returns correct values.

I've tried retrieving result as List of Object, but the result was the same

Answer 1

I have found a sufficient workaround

s.append("select id \\:\\:numeric " + //that's a hack
      "from search_department " +
      "order by id");
Query q = getEntityManager().createNativeQuery(s);
List<Long> resList = new ArrayList<>();
List<BigDecimal> biglist = q.getResultList();
for (BigDecimal id : biglist) {
    System.out.print(id + ",");
    resList.add(id.longValue());
}

Still, I'm wondering why BigInteger works incorrectly