string sql="if not exists(select * from [" + tablename + "] where ["+PKName+"]=@"+PKValue+") begin\r\n INSERT INTO [" + tablename + "](字段,字段.....)values(值,值....) \r\n end ";
string sql="if not exists(select * from [tablename ] where [PKName]='"PKValue"') begin\r\n INSERT INTO [" + tablename + "](字段,字段.....)values(值,值....) \r\n end ";
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