我正在按月份分组计算总和
Query q = entityManager.createNativeQuery(qlString);
q.setParameter("program", program);
@SuppressWarnings("unchecked")
List<Long> resultList = (List<Long>) q.getResultList();
long tend = System.currentTimeMillis();
当我将两个结果列表 (closed: 已关闭项目的结果列表, closedLate: 已过期关闭项目的结果列表) 传入一个计算百分比的方法时,我得到了
javax.servlet.ServletException: java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Long
.
private List<Long> computeOTR(List<Long> closed, List<Long> closedLate) {
List<Long> monthlyOTR = new ArrayList<Long>();
long numerator;
Long denominator;
for (int i = 0; i <11; i++) {
numerator = closed.get(i) - closedLate.get(i); <----java.lang.ClassCastException
denominator = closed.get(i);
long percentage = (int)(numerator * 100.0 / denominator + 0.5);
monthlyOTR.add(i, percentage);
}
return monthlyOTR;
}
在Eclipse调试模式下,closed被显示为BigDecimal类型。当我声明
List<Long> resultList = (List<Long>) q.getResultList();
编辑-Hibernate查询:
public List<Long> findClosedLateByProgram(String program) {
long tstart = System.currentTimeMillis();
//@formatter:off
String qlString = "with PRJ as ( " +
"select trunc(END_DATE) as END_DATE, " +
"trunc(NEED_DATE) as NEED_DATE " +
"from (SELECT UNIQUE * FROM TEST where PROGRAM_NAME = :program " +
"AND ACTION_BY_ORG = 'AAA') " +
"), " +
"DATES as ( select add_months(trunc(last_day(SYSDATE)), level-7) as thedate " +
"from dual connect by level <= 12 ) " +
"SELECT nvl(sum(case when NEED_DATE < trunc(thedate,'mm') AND END_DATE between trunc(thedate,'mm') and thedate then 1 end), 0 ) as CLOSED_LATE " +
"FROM DATES, PRJ " +
"GROUP BY thedate ORDER BY thedate";
//@formatter:on
Query q = entityManager.createNativeQuery(qlString);
q.setParameter("program", program);
// q.setParameter("today",date, TemporalType.DATE);
@SuppressWarnings("unchecked")
List<Long> resultList = q.getResultList();
long tend = System.currentTimeMillis();
long elapsed = tend-tstart;
System.out.println("Elapsed Time For Closed But Late: " + elapsed);
return resultList;
}
编辑2
我认为我被一个BigDecimal卡住了? http://weblogs.java.net/blog/mb124283/archive/2007/04/java_persistenc.html