判断一下即可string sql=select * from ov_class;
if(num2 >0)
sql+= " where id = '" + num2 + "'"using (IDataReader reader = Conn.ExecuteReader(sql))
if(num2 >0)
sql+= " where id = '" + num2 + "'"using (IDataReader reader = Conn.ExecuteReader(sql))
调试欢乐多
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货