如何知道行是否已更新

我需要阻止用户通过编写某人不在应用程序上的批准。我已经将Where IS NULL设置为阻止它覆盖数据，但我需要显示一个标签，说明记录未更新为已批准。如何知道行是否已更新

我如何知道sql查询是否更新或没有，并获取该信息，所以我可以做一个If语句。

If row updated then 
    label.text = "data approved" 
else 
    label.text = "You can not approve this as it's already approved" 


CheckBox ckb = (CheckBox)sender; 
     GridViewRow row = (GridViewRow)ckb.Parent.Parent;   //Get row selected 
     int idx = row.RowIndex; 

     //Get activity number ID for update query 
     Label lblDHActivityNoApp = (Label)row.Cells[0].FindControl("lblDHActivityNoApp"); 
     string Number = lblDHActivityNoApp.Text.ToString(); 

     string connectionString = ConfigurationManager.ConnectionStrings["PlusConnectionString"].ConnectionString; 
     string UpdateSql = "UPDATE Activities SET Status = @Status, [email protected], [email protected] WHERE ApprovedBy IS NULL and ([email protected])"; 
     //Create SQL connection 
     SqlConnection con = new SqlConnection(connectionString); 

     //Create SQL Command And Sql Parameters 
     SqlCommand cmd = new SqlCommand(); 
     cmd.Connection = con; 
     cmd.CommandType = CommandType.Text; 
     cmd.CommandText = UpdateSql; 

     SqlParameter Status = new SqlParameter("@Status", SqlDbType.VarChar, 40); 
     Status.Value = "Approved"; 
     cmd.Parameters.Add(Status); 

     SqlParameter ApprovedDate = new SqlParameter("@ApprovedDate", SqlDbType.VarChar, 50); 
     DateTime myDateTime = DateTime.Now; ; 
     ApprovedDate.Value = myDateTime.ToString("dd/MM/yy HH:mm:ss"); 
     cmd.Parameters.Add(ApprovedDate); 

     SqlParameter ApprovedBy = new SqlParameter("@ApprovedBy", SqlDbType.VarChar, 40); 
     ApprovedBy.Value = (string)Session["Username"]; 
     cmd.Parameters.Add(ApprovedBy); 

     SqlParameter No = new SqlParameter("@No", SqlDbType.VarChar, 50); 
     No.Value = Number; 
     cmd.Parameters.Add(No); 

     try 
     { 
      con.Open(); 
      cmd.ExecuteNonQuery(); 
      gbDHdetailsApp.DataBind(); //Reloads gridview with checked data  
     } 

     catch (SqlException ex) 
     { 
      string errorMessage = "Not approved, please contact support"; 
      errorMessage += ex.Message; 
      throw new Exception(errorMessage); 
     } 

     finally 
     { 
      con.Close(); 
     }

来源

2016-07-07 Alexandria

ExecuteNonQuery()返回受影响的行数和具有返回类型INT，因此你可以像

int rowsAffected = cmd.ExecuteNonQuery(); 

if(rowsAffected > 0) 
{ 
    // do something 
}

来源

2016-07-07 11:17:40 Rahul

ExecuteNonQuery返回受影响的行数。如果这是0，则可以抛出一个Exception。

来源

2016-07-07 11:15:07 RvdK

如何知道行是否已更新

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