hibernate原生sql封装，报错信息：could not find setter for ...

在mysql环境下，以下代码，在mysql下运行正常，但是切换到oralce，报出找不到STUDENTNAME属性的错误。 

List resultWithAliasedBean = s.createSQLQuery(
  "SELECT st.name as studentName, co.description as courseDescription " +
  "FROM Enrolment e " +
  "INNER JOIN Student st on e.studentId=st.studentId " +
  "INNER JOIN Course co on e.courseCode=co.courseCode")
  .setResultTransformer( Transformers.aliasToBean(StudentDTO.class))
  .list();

分析：原来是oracle自动将列映射的studentName转换为大写的STUDENTNAME，所以不能映射，报类找不到STUDENTNAME的set方法。 
解决办法：添加addScalar方法，代码如下： 

List resultWithAliasedBean = s.createSQLQuery(
  "SELECT st.name as studentName, co.description as courseDescription " +
  "FROM Enrolment e " +
  "INNER JOIN Student st on e.studentId=st.studentId " +
  "INNER JOIN Course co on e.courseCode=co.courseCode")
  .addScalar("studentName")
  .addScalar("courseDescription")
  .setResultTransformer( Transformers.aliasToBean(StudentDTO.class))
  .list();

Tip: the addScalar() calls were required on HSQLDB to make it match a property name since it returns column names in all uppercase (e.g. "STUDENTNAME"). This could also be solved with a custom transformer that search the property names instead of using exact match - maybe we should provide a fuzzyAliasToBean() method ; 

还有一种方式解决，就是使用双引号将别名包裹起来，感觉不是很优雅。像这样 

String sql = "select id as \"id\",iata as \"iata\",flight as \"flight\",dest as \"dest\",domint as \"domint\" " +
            " ,sdt as \"sdt\",task_nature as \"taskNature\",est_date as \"estDate\",act_date as \"actDate\",remark as \"remark\" " +
            " from FIDS_DEPF";

createSQLQuery  setFirstResult设置起始记录，setMaxResult设置结束记录 sql里有用分组函数，返回非持久化对象  当firstResult=0，正常，当firstResult>0时，报错。  大家是否遇到过？ 

public List findBySql(String sql, List params, int pageNo, int pageSize,
Class clazz) {
SQLQuery sqlQuery = getCurrentSession().createSQLQuery(sql);
if (params != null && !params.isEmpty()) {
for (int i = 0, size = params.size(); i < size; i++) {
sqlQuery.setParameter(i, params.get(i));
}
}
sqlQuery.setFirstResult((pageNo - 1) * pageSize);
sqlQuery.setMaxResults(pageSize);
sqlQuery.setResultTransformer(Transformers.aliasToBean(clazz));
return sqlQuery.list();
}

问题补充：报错信息：could not find setter for rownum_ 

用createSQLQuery的方式，查询的结果setResultTransformer()了一下。 
并且设置了firstResult和MaxResult. 

现象： 
当firstResult为0的时候，一切正常，当firstResult不为0的时候报 “could not find setter for rownum_”的错误 
如果不setResultTransformer，设置的firstResult和MaxResult不受影响。 

主要是改sql 
1、别名要大写 
如：select day DAY,count(id) COUNT from t_name group by day 
像楼下给的链接的解释，oracle自动将别名大写，但是如果自己设置了小写的，就会出现上面的问题。 为了避免addScalar多个，建议将别名直接大写。 
2、当然你可以采用多个addScalar，这样只会，你就不能封装为通用的dao了。