訂單號生成方法
package com.jae.impl;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
@Service
public class OrderServiceBean extends DaoSupport<Order> implements OrderService{
* 生成訂單號,訂單號的組成 兩位年+兩位月+兩位日+兩位小時+當天的訂單總數 如:11071012100
* @param createDate
* @return
*/
private String buildOrderid(Date createDate) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyMMddHH");
StringBuilder out = new StringBuilder(dateFormat.format(createDate));
dateFormat = new SimpleDateFormat("yyyy-MM-dd");
String strdate = dateFormat.format(createDate);// 2011-07-10
Date date = createDate;
try {
date = dateFormat.parse(strdate);
} catch (ParseException e) {e.printStackTrace();}
long count = (Long)em.createQuery("select count(o) from Order o where o.createDate>=?1")
.setParameter(1, date, TemporalType.TIMESTAMP).getSingleResult();
out.append(count+1);
return out.toString();
}
}