IF NOT EXISTS，UPDATE語句錯誤

我有這樣的代碼，一個POST請求來更新數據庫中的記錄：IF NOT EXISTS，UPDATE語句錯誤

if (Server.HtmlDecode(Request.RequestType).Equals("POST")) 
    { 
     string connectionstring = @"Data Source=sql2008.net.dcs.hull.ac.uk;Initial Catalog=rde_440881;Integrated Security=True"; 
     SqlConnection con = new SqlConnection(connectionstring); 
     con.Open(); 

     string FullName = null; 
     FullName = Request.QueryString["FullName"]; 

     string Location = null; 
     Location = Request.QueryString["Location"]; 

     string Username = "default";   
     string TimeOfLastUpdate = "default"; 

     SqlCommand command = new SqlCommand("IF NOT EXISTS(SELECT (FullName) FROM [Staff] WHERE [FullName] = @FullName" + " INSERT INTO [Staff] ([Username], [FullName], [Location], [TimeOfLastUpdate]) VALUES (@Username, @FullName, @Location, @TimeOfLastUpdate)" + "else" + "UPDATE [Staff] SET [Location] = @Location, [TimeOfLastUpdate] = @TimeOfLastUpdate WHERE [FullName] = @FullName", con); 
     command.Parameters.AddWithValue("@UserName", Username); 
     command.Parameters.AddWithValue("@FullName", FullName); 
     command.Parameters.AddWithValue("@Location", Location); 
     command.Parameters.AddWithValue("@TimeOfLastUpdate", TimeOfLastUpdate); 
     command.ExecuteNonQuery(); 
     Response.Write("The location is now" + Location); 
     con.Close(); 
    }

但是當我嘗試和執行瀏覽器中的POST請求我得到的錯誤：

和「附近關鍵字‘插入’不正確的語法」，「附近有語法錯誤elseUPDATE'。」

來源

2014-05-06 Anjola

你忘了字符串中的其他人後添加一個空格之後。它應該是「別人」 +「UPDATE – Bedford

您好，感謝您的答覆，我沒有你所說的話，但仍然得到這兩個錯誤」附近關鍵字‘插入’不正確的語法。關鍵字附近不正確的語法「其他」。」 – Anjola

，你忘了EXIST聲明 – Bedford

它應該是這樣的

SqlCommand command = new SqlCommand("IF NOT EXISTS(SELECT (FullName) FROM [Staff] WHERE [FullName] = @FullName) " + 
    "INSERT INTO [Staff] ([Username], [FullName], [Location], [TimeOfLastUpdate]) VALUES (@Username, @FullName, @Location, @TimeOfLastUpdate) " + 
    "else" + 
    " UPDATE [Staff] SET [Location] = @Location, [TimeOfLastUpdate] = @TimeOfLastUpdate WHERE [FullName] = @FullName ", con);

我加了括號結束的EXISTS和圍繞「其他」一對夫婦的間距問題

來源

2014-05-06 23:33:18 attila

完美！謝謝你的幫助 – Anjola

IF NOT EXISTS，UPDATE語句錯誤

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