Hibernate Positional参数不存在:查询中为1

Question

我正在尝试执行以下查询,但接收下面的异常.

   List<Category> cats = session.createCriteria(Category.class).add(criterion).list();
    Map<Integer, CategoryNode> childNodes = new LinkedHashMap<Integer, CategoryNode>();
    for (Category cat : cats) {
        CategoryNode childNode = new CategoryNode();
        childNode.setCategory(cat);
        childNodes.put(cat.getId(), childNode);
    }
    StringBuilder questions = new StringBuilder();
    for (int i = 0; i < childNodes.size(); ++i) {
        if (i != 0) {
            questions.append(", ");
        }
        questions.append("?");
    }


    Query query = session.createSQLQuery(
            "select c1.id, count(c2.id) "
            + "from CATEGORY c1 "
            + "left join CATEGORY c2 on c2.parentCategoryId = c1.id "
            + "where c1.id in (" + questions + ") "
            + "group by c1.id");

    int i = 0;

    for (Iterator<CategoryNode> it = childNodes.values().iterator(); i < childNodes.size(); ++i) {
        query.setLong(i + 1, it.next().getCategory().getId());
    }

位置参数不存在:查询中的1:select c1.id,count(c2.id)from CATEGORY c1 left join CATEGORY c2 on c2.parentCategoryId = c1.id where c1.id in(？)group by c1.id

Answer 1

位置参数从0开始,因此您可能需要将设置代码更改为此

for (Iterator<CategoryNode> it = childNodes.values().iterator(); i < childNodes.size(); i++) {
    query.setLong(i, it.next().getCategory().getId());
}