以前年輕不懂事, 寫了一些很遜的程式碼, 例如:

舊的程式碼:

        public static DataTable DTFromSQL(string Sql, string DBC = null, Int32 timeout = 0)

        {

            SqlDataAdapter DA = new SqlDataAdapter(Sql, GetDBC(DBC));



            DataTable DT = new DataTable();

            try

            {

                DA = new SqlDataAdapter(Sql, DBC);

                if (timeout > 0)

                {

                    DA.SelectCommand.CommandTimeout = timeout;

                }



                DA.Fill(DT);

            }

            catch (Exception ex)

            {

                throw new Exception(ex.ToString());

            }

            finally

            {

                DA.Dispose();

            }



            return DT;

        }

新的程式碼:

        public static DataTable DTFromSQL(string Sql, string DBC = null, Int32 timeout = 30)

        {

            using (var DA = new SqlDataAdapter(Sql, GetDBC(DBC)))

            {

                //不可為 null

                DataTable DT = new DataTable();



                DA.SelectCommand.CommandTimeout = timeout;



                DA.Fill(DT);



                return DT;

            }

        }

可以參考:
https://dotblogs.com.tw/yc421206/archive/2012/01/03/64154.aspx
 

轉換文章內容成為excel 檔案的時候
發生的錯誤
網路上查都好像是跟圖片有關的錯誤
後來才確認是 emoji 的問題
文章裡有出現

🙋‍♀️🙋‍♀️🙋‍♀️

這種東西 

SQL:
SQL 好像也沒辦法完美的取代 ( 如果有辦法對準是哪個字元就可以 但如果是一個字串好像會無法取代)
只有剛好對到那個字元開頭時才能換
NCHAR(65039)  NCHAR(8205)

Select TOP 10 
Replace(SUBSTRING(content,10,15),NCHAR(65039) ,'XX') ,                                    ---HongKong‍️‍️‍️🙋‍♀️怎
REPLACE(SUBSTRING(content,17,8),NCHAR(65039),'OO')                                        ---OO怎 
FROM [Table] 


C#
最後回到C#來處理
首先用 把string  .ToArray() 變成char
找出字元後 轉成 int 來確認要怎麼表達這個 char
最後結果就變成>>
Convert.ToInt32(Table.Rows[0]["Content"].ToString().ToArray());
之後直接變成 char去取代
row["mycolumn"].ToString().Replace((char)65039, ' ').Replace((char)8205, ' ');
然後就暫時 沒錯誤了
只是這網站一直再更新
https://emojipedia.org/unicode-12.0/

所以未來可能還會有新的問題
目前還不知道甚麼快速的解法







 

修改欄位設定時，出現需要刪除資料表(drop table)再建立資料表(create table)才能修改時，
於 [工具] > [選項] > [設計工具]
清除防止儲存需要重新建立資料表的變更] 核取方塊，即可。
如下圖


參考網址：https://support.microsoft.com/zh-tw/help/956176/error-message-when-you-try-to-save-a-table-in-sql-server-saving-change
 

Visual Studio 預設發佈的模式是不包括錯誤行號的. 要開啟在這裡設定:



還有 option 要設定:

 
 

不要自動加 "s"

 

突然發現 yahoo 不支援 SSL3.0 或 TLS 1.0 了, 要改用 TLS 1.2 才抓的到網頁資料

​

            ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

            ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

.Net 4.0 在抓網頁之前先加這兩行, 就可以了. 

.Net 4.5 支援 Tls12, 可以用 

​

            ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

​

 

<a class="del" href="#" data-yano="1250453286" data-pdno="04360003">

    <img src="/TC/template/Shopping/images/del.png" alt="">

</a>

用 $(".del").data("pdno") 會回傳 4360003
被這個搞了好久..

要避免這個問題, 可以使用 attr  來代替 data
$(".del").attr("data-pdno")

由於從欄位抓出的值 雖然是由逗點分隔 但整體資料容易被當成一組單一字串
例如
Table
#SomeTable
欄位 :
Id  MemberIds
值
1 12,30,58
2 45,68,88

想要篩選  where member_Id in (select MemberIds from SomeTable  where Id = 2)
會被當成  Id in ('45,68,88')  文字跟整數無法被篩選

解決方法之一

  create table #SomeTable (Id int,MemberIds nvarchar(30))
  insert into #SomeTable (Id,MemberIds) values (1,'12,30,58')
  insert into #SomeTable (Id,MemberIds) values (2,'45,68,88')
  select * from #SomeTable

  create table #TargetTable (Id int,member_Id  nvarchar(30))
  insert into #TargetTable (Id,member_Id ) values (1,12)
  insert into #TargetTable (Id,member_Id ) values (2,30)
  insert into #TargetTable (Id,member_Id ) values (3,45)
  insert into #TargetTable (Id,member_Id ) values (4,58)      
  insert into #TargetTable (Id,member_Id ) values (5,68)
  insert into #TargetTable (Id,member_Id ) values (6,88)
  select * from #TargetTable

DECLARE @MemberIds nvarchar(200);DECLARE @SQLString nvarchar(200);
select  @MemberIds =MemberIds  from #SomeTable(nolocK) where Id = 2
SET @SQLString = N' select * from #TargetTable   where member_Id in (' + @MemberIds  + ')' ;  
EXECUTE sp_executesql @SQLString

將整體都當成字串   就可以執行了

如果用逗點隔開如果用逗點隔開的是字串
如:
Hi,Im,String
可以先把它加上單引號
select '''' + Replace(MemberIds ,',','''' +',' + '''') + '''' from #SomeTable 






 

今天遇到客戶的 DB  使用空間滿了. 有  "Active Transaction" 

什麼事十日都不能做, 只好刪掉所有的 Session. 使用的 SQL 如下:

SQL 2012
USE [master];

DECLARE @kill varchar(8000) = '';  
SELECT @kill = @kill + 'kill ' + CONVERT(varchar(5), session_id) + ';'  
FROM sys.dm_exec_sessions
WHERE database_id  = db_id('MyDB')

EXEC(@kill);


​
For MS SQL Server 2000, 2005, 2008
USE master;

DECLARE @kill varchar(8000); SET @kill = '';  
SELECT @kill = @kill + 'kill ' + CONVERT(varchar(5), spid) + ';'  
FROM master..sysprocesses  
WHERE dbid = db_id('MyDB')

EXEC(@kill); 

客戶要求
1. 檔案只能放在 Firewall 內的後台用 Web server (Server A).
2. 使用者只能存取 DMZ 的 Web server (Server B).
3. Server B 只能用 HTTP 通過 Firewall 向 Server A 要資料.(i.e.  Server B 不能掛戴 Server A 的目錄成為虛擬目錄)

所以在 Server B 上面建立了一支程式用 HTTP 的方式讀取 Server A 的檔案再寫出去.

例如, http://ServerB/Upload/test.pdf 會讀取 http://ServerA/Upload/test.pdf 再送到 Client 端

namespace WWW.Controllers

{

    public class UploadController : Controller

    {

        // GET: Upload

        public void Index(string Filename)

        {

            //Create a stream for the file

            Stream stream = null;



            //This controls how many bytes to read at a time and send to the client

            int bytesToRead = 10000;



            // Buffer to read bytes in chunk size specified above

            byte[] buffer = new Byte[bytesToRead];



            string url = "http://admin-dev.nanya.bike.idv.tw/newnanyaback/Upload/" + Filename;



            // The number of bytes read

            try

            {

                //Create a WebRequest to get the file

                HttpWebRequest fileReq = (HttpWebRequest)HttpWebRequest.Create(url);



                //Create a response for this request

                HttpWebResponse fileResp = (HttpWebResponse)fileReq.GetResponse();



                if (fileReq.ContentLength > 0)

                    fileResp.ContentLength = fileReq.ContentLength;



                //Get the Stream returned from the response

                stream = fileResp.GetResponseStream();



                // prepare the response to the client. resp is the client Response

                var resp = HttpContext.Response;



                if (Filename.ToLower().EndsWith(".png") ||

                    Filename.ToLower().EndsWith(".jpg") ||

                    Filename.ToLower().EndsWith(".jpeg") ||

                    Filename.ToLower().EndsWith(".gif")

                    )

                {

                    resp.ContentType = "image";

                }

                else

                {

                    //Indicate the type of data being sent

                    resp.ContentType = "application/octet-stream";



                    //Name the file

                    resp.AddHeader("Content-Disposition", "attachment; filename=\"" + HttpUtility.UrlEncode(Filename, Encoding.UTF8) + "\"");

                }



                resp.AddHeader("Content-Length", fileResp.ContentLength.ToString());



                int length;

                do

                {

                    // Verify that the client is connected.

                    if (resp.IsClientConnected)

                    {

                        // Read data into the buffer.

                        length = stream.Read(buffer, 0, bytesToRead);



                        // and write it out to the response's output stream

                        resp.OutputStream.Write(buffer, 0, length);



                        // Flush the data

                        resp.Flush();



                        //Clear the buffer

                        buffer = new Byte[bytesToRead];

                    }

                    else

                    {

                        // cancel the download if client has disconnected

                        length = -1;

                    }

                } while (length > 0); //Repeat until no data is read

            }

            finally

            {

                if (stream != null)

                {

                    //Close the input stream

                    stream.Close();

                }

            }

        }

    }

}

但不是這樣就好了, 在 RouteConfig.cs 中要加上:
            routes.MapRoute(
                name: "Upload",
                url: "Upload/{filename}",
                defaults: new { controller = "Upload", action = "Index", filename = UrlParameter.Optional }
            );

此外在 Web.Config 中也要加上:

  <system.webServer>
    <handlers>
      <add name="UrlRoutingHandler_Upload"
           type="System.Web.Routing.UrlRoutingHandler, 
               System.Web, Version=4.0.0.0, 
               Culture=neutral, 
               PublicKeyToken=b03f5f7f11d50a3a"
           path="/Upload/*"
           verb="GET"/>
    </handlers>
  </system.webServer>

參考:
http://stackoverflow.com/questions/5596747/download-stream-file-from-url-asp-net

http://blog.darkthread.net/post-2014-12-05-mvc-routing-for-url-with-filename.aspx