02 2023 档案

摘要:DataTable dt=new DataTable(); dt.Columns.Add("ID", typeof(int)); dt.Columns.Add("name",typeof(string)); dt.Columns.Add("sex", typeof(string)); dt.Colu 阅读全文
posted @ 2023-02-23 11:06 Joooannes 阅读(598) 评论(0) 推荐(0)
摘要:主要是三种情况: 1、sqlcommand执行超时; 2、sqlconnection执行超时; 3、数据库掉线TCP连接不上,针对第三种情况代码如下: static void QuickOpen(this SqlConnection conn, int timeout) { // We'll use 阅读全文
posted @ 2023-02-16 10:05 Joooannes 阅读(779) 评论(0) 推荐(0)
摘要:SELECT * FROM TB_PDO WHERE COIL_NUMBER_IN IN (SELECT COIL_NUMBER_IN FROM TB_PDO GROUP BY COIL_NUMBER_IN HAVING COUNT(COIL_NUMBER_IN)>1) ORDER BY ID DE 阅读全文
posted @ 2023-02-15 09:44 Joooannes 阅读(78) 评论(0) 推荐(0)