Hibernate本机查询显示异常

Question

I have written hibernate native query for getting total users and month from table.
But it shows :

exception:Operand should contain 1 column(s)
org.hibernate.exception.DataException: could not execute query

could anyone please help me for solving this:

  c.setProjection(Projections.projectionList()
     .add(Projections.sqlProjection("(select count(*), MONTH(Stored) from adbtbl_stat " 
     + "where Activity = 89 and YEAR(Stored) = 2015) as Count, month",
     new String[] { "Count", "month" }, new Type[] { LongType.INSTANCE, StringType.INSTANCE }))
     .add(Projections.groupProperty(month(stored))));

Answer 1

A ProjectionList can contain multiple SQLProjection(s) , but each SQLProjection should be associated to one and only one SQL columns.

You SQLProjection tries to select two columns instead.

Try replacing your Criteria query with a simple native query instead:

Long activity = ...;
int year = ...;

Query q = entityManager.createNativeQuery(
    "select count(*) as Count, MONTH(Stored) as Month " +
    "from adbtbl_stat " +
    "where Activity = :activity and YEAR(Stored) = :year"
);
q.setParameter("activity", activity);
q.setParameter("year", year);
List<Object[]> result = (List<Object[]>) q.getResultList();