hibernate - HQL：玩弄变量

Question

我有这些测试查询：

String query = "";    
Query criteria;
query = 
  "from Test t " +
  "where (:value is null OR t.id = :value)"; // update: (t.id = (:value))

criteria = session.createQuery(query);

if (.. some condition ..) {
  criteria.setParameter("value", 0);
}
else {
  criteria.setParameter("value", null);
}

如何仅使用参数将 where 条件从更改id = 0为(id = 0 or id = 1)（resp。 ）？id < 2value

Answer 1

您可以使用“where in”运算符。然后“值”将成为集合参数。

Query criteria;
query = 
  "from Test t " +
  "where (t.id in (:value))";

criteria = session.createQuery(query);
criteria.setParameterList("value", Arrays.asList(0, 1));