[英]Get last id of an entity in hibernate
我需要一种方法来获取数据库中实体的最后一个ID,例如说
产品实体:
我尝试这样做,但不起作用:
public int lastInsertedId() {
try {
if (!session.isOpen())
session = DatabaseUtil.getSessionFactory().openSession();
session.beginTransaction();
Query query = session.createSQLQuery("select last_value from purchase_idpurchase_seq ");
int lastid = query.getFirstResult();
session.getTransaction().commit();
session.close();
return lastid;
} catch (Exception e) {
e.printStackTrace();
return -1;
}
}
经过一番谷歌搜索,我得到了解决方案:
public int lastInsertedId() {
try {
if (!session.isOpen())
session = DatabaseUtil.getSessionFactory().openSession();
session.beginTransaction();
Criteria c = session.createCriteria(Purchase.class);
c.addOrder(Order.desc("id"));
c.setMaxResults(1);
int id = (int) ((Purchase) c.uniqueResult()).getIdPurchase();
session.getTransaction().commit();
session.close();
return id;
} catch (Exception e) {
e.printStackTrace();
return -1;
}
}
尝试使用如下形式:
String hql = "from purchase_idpurchase_seq";
Query query = session.createQuery(hql);
List<purchase_idpurchase_seq> results = query.list();
并获取last_value
的值, last_value
尝试以下操作:
String last_value = results.getLast_value(); // if getLast_value return int use int.
我想您有一个实体purchase_idpurchase_seq
尝试看看这个网站
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