[英]Error while executing a sql command in c#
我在C#中使用asp.net,這些代碼行中存在錯誤。
protected void btnsubmit_Click(object sender, EventArgs e)
{
string type = "c";
string FID = Session["FID"].ToString();
SqlConnection cn = new SqlConnection();
SqlCommand cmd = new SqlCommand();
//int str_diff = Convert.ToInt32(ConfigurationManager.AppSettings["Difference"]);
cn.ConnectionString = @"Data Source=BOPSERVER;Initial Catalog=Project;Integrated Security=True";
cn.Open();
cmd.CommandText = "update TrackingFaculty_det SET Type=@Type WHERE (FID=@FID) and DATEDIFF(d,TrackingFaculty_det.LastUpdateDate,GETDATE())>60";
cmd.Parameters.Add("@FID",SqlDbType.VarChar,10);
cmd.Parameters["@FID"].Value = FID;
cmd.Parameters.Add("@Type", SqlDbType.VarChar, 1);
cmd.Parameters["@Type"].Value = type;
cmd.ExecuteNonQuery();
cn.Close();
Response.Redirect("~/Faculty/Personaldet.aspx");
}
您尚未將連接設置為命令
cmd.Connection = cn;
您需要將SqlConnection
分配給SqlCommand
。 作為其他建議,我會將連接包裝在using塊中,以確保在發生異常的情況下正確處理該連接。
using (SqlConnection cn = new SqlConnection(@"Data Source=BOPSERVER;Initial Catalog=Project;Integrated Security=True")
{
cn.Open();
SqlCommand cmd = new SqlCommand("update TrackingFaculty_det SET Type=@Type WHERE (FID=@FID) and DATEDIFF(d,TrackingFaculty_det.LastUpdateDate,GETDATE())>60", cn);
cmd.Parameters.Add("@FID",SqlDbType.VarChar,10);
cmd.Parameters["@FID"].Value = FID;
cmd.Parameters.Add("@Type", SqlDbType.VarChar, 1);
cmd.Parameters["@Type"].Value = type;
cmd.ExecuteNonQuery();
}
SqlCommand cmd = new SqlCommand("update TrackingFaculty_det SET Type=@Type WHERE (FID=@FID) and DATEDIFF(d,TrackingFaculty_det.LastUpdateDate,GETDATE())>60", cn);
cmd.Parameters.Add("@FID",SqlDbType.VarChar,10);
cmd.Parameters["@FID"].Value = FID;
cmd.Parameters.Add("@Type", SqlDbType.VarChar, 1);
cmd.Parameters["@Type"].Value = type;
cmd.ExecuteNonQuery();
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