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
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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
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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
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