1.比较下面代码,两段代码执行时间差不多,代码一中使用了连接复用(每次并不是真正关闭) 1)每插入一条数据,连接打开“关闭” string[] telNum = File.ReadAllLines(ofd.FileName, Encoding.Default).ToArray(); // for (int i = 1; i < telNum.Count(); ++i) // { // string[] strs = telNum[i].Split(‘\t‘);//Tab键转义为“\t” // string telnum = strs[0]; // string telarea = strs[1]; // string teltype = strs[2]; // string areanum = strs[3]; // SqlHelper.ExecuteNonQuery(sql, // new SqlParameter("@TelNum", telnum), // new SqlParameter("@TelNumArea", telarea), // new SqlParameter("@TelNumType", teltype), // new SqlParameter("@AreaNum", areanum)); // } 2)一次打开,插入完成再关闭 string[] telNum = File.ReadAllLines(ofd.FileName, Encoding.Default).ToArray(); using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=stu;User ID=sa;Password=tao201415shu")) { conn.Open(); using(SqlCommand cmd=conn.CreateCommand()) { for (int i = 1; i < telNum.Count(); ++i) { string[] strs = telNum[i].Split(‘\t‘);//Tab键转义为“\t” string telnum = strs[0].Trim(‘"‘); string telarea = strs[1].Trim(‘"‘); string teltype = strs[2].Trim(‘"‘); string areanum = strs[3].Trim(‘"‘); //cmd.Parameters.Add(new SqlParameter("@TelNum", telnum)); //cmd.Parameters.Add(new SqlParameter("@TelNumArea", telarea)); //cmd.Parameters.Add(new SqlParameter("@TelNumType", teltype)); //cmd.Parameters.Add(new SqlParameter("@AreaNum", areanum)); //AddParams(cmd, strs); sql = "insert into T_TelNumSearch(TelNum,TelNumArea,TelNumType,AreaNum)values(‘"+telnum+"‘,‘"+telarea+"‘,‘"+teltype+"‘,‘"+areanum+"‘)"; cmd.CommandText = sql; cmd.ExecuteNonQuery(); } } }
时间: 2024-10-10 05:38:50