项目中,用到一个序列作单号,框架用的是ssh,在dao层去拿的时候,运行时报错为dual is not mapped,[select ordercode_seq_id.nextval nextvalue from dual]
后来检查发现,获取方式不对,于是改成下面这样,就可以正常获取了
public String getOrderCode() { try { String sql = "select ordercode_seq_id.nextval nextvalue from dual"; Integer maxId = (Integer)(this.getSession().createSQLQuery(sql).addScalar("nextvalue", Hibernate.INTEGER) ).uniqueResult(); return maxId.toString(); } catch (Exception e) { e.printStackTrace(); } return null; }
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